Tomography using x-ray transmission and a computer algorithm to reconstruct the image.
Imaging methods that result in sharp images of objects located on a chosen plane and blurred images located above or below the plane.
An imaging technique using compounds labelled with short-lived positron-emitting radionuclides (such as carbon-11, nitrogen-13, oxygen-15 and fluorine-18) to measure cell metabolism. It has been useful in study of soft tissues such as CANCER; CARDIOVASCULAR SYSTEM; and brain. SINGLE-PHOTON EMISSION-COMPUTED TOMOGRAPHY is closely related to positron emission tomography, but uses isotopes with longer half-lives and resolution is lower.
An imaging method using LASERS that is used for mapping subsurface structure. When a reflective site in the sample is at the same optical path length (coherence) as the reference mirror, the detector observes interference fringes.
Tomography using radioactive emissions from injected RADIONUCLIDES and computer ALGORITHMS to reconstruct an image.
Computed tomography where there is continuous X-ray exposure to the patient while being transported in a spiral or helical pattern through the beam of irradiation. This provides improved three-dimensional contrast and spatial resolution compared to conventional computed tomography, where data is obtained and computed from individual sequential exposures.
Projection of near-IR light (INFRARED RAYS), in the 700-1000 nm region, across an object in parallel beams to an array of sensitive photodetectors. This is repeated at various angles and a mathematical reconstruction provides three dimensional MEDICAL IMAGING of tissues. Based on the relative transparency of tissues to this spectra, it has been used to monitor local oxygenation, brain and joints.
Penetrating, high-energy electromagnetic radiation emitted from atomic nuclei during NUCLEAR DECAY. The range of wavelengths of emitted radiation is between 0.1 - 100 pm which overlaps the shorter, more energetic hard X-RAYS wavelengths. The distinction between gamma rays and X-rays is based on their radiation source.
Examination of any part of the body for diagnostic purposes by means of X-RAYS or GAMMA RAYS, recording the image on a sensitized surface (such as photographic film).
Types of spiral computed tomography technology in which multiple slices of data are acquired simultaneously improving the resolution over single slice acquisition technology.
A method of computed tomography that uses radionuclides which emit a single photon of a given energy. The camera is rotated 180 or 360 degrees around the patient to capture images at multiple positions along the arc. The computer is then used to reconstruct the transaxial, sagittal, and coronal images from the 3-dimensional distribution of radionuclides in the organ. The advantages of SPECT are that it can be used to observe biochemical and physiological processes as well as size and volume of the organ. The disadvantage is that, unlike positron-emission tomography where the positron-electron annihilation results in the emission of 2 photons at 180 degrees from each other, SPECT requires physical collimation to line up the photons, which results in the loss of many available photons and hence degrades the image.
Computed tomography modalities which use a cone or pyramid-shaped beam of radiation.
A tomographic technique for obtaining 3-dimensional images with transmission electron microscopy.
Tomography using x-ray transmission.
Identification and measurement of ELEMENTS and their location based on the fact that X-RAYS emitted by an element excited by an electron beam have a wavelength characteristic of that element and an intensity related to its concentration. It is performed with an electron microscope fitted with an x-ray spectrometer, in scanning or transmission mode.
The compound is given by intravenous injection to do POSITRON-EMISSION TOMOGRAPHY for the assessment of cerebral and myocardial glucose metabolism in various physiological or pathological states including stroke and myocardial ischemia. It is also employed for the detection of malignant tumors including those of the brain, liver, and thyroid gland. (From Martindale, The Extra Pharmacopoeia, 30th ed, p1162)
A diffuse parenchymal lung disease caused by inhalation of dust and by tissue reaction to their presence. These inorganic, organic, particulate, or vaporized matters usually are inhaled by workers in their occupational environment, leading to the various forms (ASBESTOSIS; BYSSINOSIS; and others). Similar air pollution can also have deleterious effects on the general population.
A subclass of cartilaginous fish comprising the SHARKS; rays; skates (SKATES (FISH);), and sawfish. Elasmobranchs are typically predaceous, relying more on smell (the olfactory capsules are relatively large) than sight (the eyes are relatively small) for obtaining their food.
X-ray image-detecting devices that make a focused image of body structures lying in a predetermined plane from which more complex images are computed.
The common name for all members of the Rajidae family. Skates and rays are members of the same order (Rajiformes). Skates have weak electric organs.
The process of generating three-dimensional images by electronic, photographic, or other methods. For example, three-dimensional images can be generated by assembling multiple tomographic images with the aid of a computer, while photographic 3-D images (HOLOGRAPHY) can be made by exposing film to the interference pattern created when two laser light sources shine on an object.
The amount of radiation energy that is deposited in a unit mass of material, such as tissues of plants or animal. In RADIOTHERAPY, radiation dosage is expressed in gray units (Gy). In RADIOLOGIC HEALTH, the dosage is expressed by the product of absorbed dose (Gy) and quality factor (a function of linear energy transfer), and is called radiation dose equivalent in sievert units (Sv).
Binary classification measures to assess test results. Sensitivity or recall rate is the proportion of true positives. Specificity is the probability of correctly determining the absence of a condition. (From Last, Dictionary of Epidemiology, 2d ed)
Neutrons, the energy of which exceeds some arbitrary level, usually around one million electron volts.
Hospital department which is responsible for the administration and provision of x-ray diagnostic and therapeutic services.
The statistical reproducibility of measurements (often in a clinical context), including the testing of instrumentation or techniques to obtain reproducible results. The concept includes reproducibility of physiological measurements, which may be used to develop rules to assess probability or prognosis, or response to a stimulus; reproducibility of occurrence of a condition; and reproducibility of experimental results.
Non-invasive method of demonstrating internal anatomy based on the principle that atomic nuclei in a strong magnetic field absorb pulses of radiofrequency energy and emit them as radiowaves which can be reconstructed into computerized images. The concept includes proton spin tomographic techniques.
The joint that is formed by the distal end of the RADIUS, the articular disc of the distal radioulnar joint, and the proximal row of CARPAL BONES; (SCAPHOID BONE; LUNATE BONE; triquetral bone).
A technique of inputting two-dimensional images into a computer and then enhancing or analyzing the imagery into a form that is more useful to the human observer.
Observation of a population for a sufficient number of persons over a sufficient number of years to generate incidence or mortality rates subsequent to the selection of the study group.
Studies used to test etiologic hypotheses in which inferences about an exposure to putative causal factors are derived from data relating to characteristics of persons under study or to events or experiences in their past. The essential feature is that some of the persons under study have the disease or outcome of interest and their characteristics are compared with those of unaffected persons.
The effects of ionizing and nonionizing radiation upon living organisms, organs and tissues, and their constituents, and upon physiologic processes. It includes the effect of irradiation on food, drugs, and chemicals.
In screening and diagnostic tests, the probability that a person with a positive test is a true positive (i.e., has the disease), is referred to as the predictive value of a positive test; whereas, the predictive value of a negative test is the probability that the person with a negative test does not have the disease. Predictive value is related to the sensitivity and specificity of the test.
That portion of the electromagnetic spectrum immediately below the visible range and extending into the x-ray frequencies. The longer wavelengths (near-UV or biotic or vital rays) are necessary for the endogenous synthesis of vitamin D and are also called antirachitic rays; the shorter, ionizing wavelengths (far-UV or abiotic or extravital rays) are viricidal, bactericidal, mutagenic, and carcinogenic and are used as disinfectants.
The electronic transmission of radiological images from one location to another for the purposes of interpretation and/or consultation. Users in different locations may simultaneously view images with greater access to secondary consultations and improved continuing education. (From American College of Radiology, ACR Standard for Teleradiology, 1994, p3)
The spectrometric analysis of fluorescent X-RAYS, i.e. X-rays emitted after bombarding matter with high energy particles such as PROTONS; ELECTRONS; or higher energy X-rays. Identification of ELEMENTS by this technique is based on the specific type of X-rays that are emitted which are characteristic of the specific elements in the material being analyzed. The characteristic X-rays are distinguished and/or quantified by either wavelength dispersive or energy dispersive methods.
The relationship between the dose of administered radiation and the response of the organism or tissue to the radiation.
The articulation between a metacarpal bone and a phalanx.
Any of the numerous types of clay which contain varying proportions of Al2O3 and SiO2. They are made synthetically by heating aluminum fluoride at 1000-2000 degrees C with silica and water vapor. (From Hawley's Condensed Chemical Dictionary, 11th ed)
Membranous appendage of fish and other aquatic organisms used for locomotion or balance.
The region of the HAND between the WRIST and the FINGERS.
Devices or objects in various imaging techniques used to visualize or enhance visualization by simulating conditions encountered in the procedure. Phantoms are used very often in procedures employing or measuring x-irradiation or radioactive material to evaluate performance. Phantoms often have properties similar to human tissue. Water demonstrates absorbing properties similar to normal tissue, hence water-filled phantoms are used to map radiation levels. Phantoms are used also as teaching aids to simulate real conditions with x-ray or ultrasonic machines. (From Iturralde, Dictionary and Handbook of Nuclear Medicine and Clinical Imaging, 1990)
The failure by the observer to measure or identify a phenomenon accurately, which results in an error. Sources for this may be due to the observer's missing an abnormality, or to faulty technique resulting in incorrect test measurement, or to misinterpretation of the data. Two varieties are inter-observer variation (the amount observers vary from one another when reporting on the same material) and intra-observer variation (the amount one observer varies between observations when reporting more than once on the same material).
Computer systems or networks designed to provide radiographic interpretive information.
X-RAY COMPUTERIZED TOMOGRAPHY with resolution in the micrometer range.
Elements of limited time intervals, contributing to particular results or situations.
The female sex chromosome, being the differential sex chromosome carried by half the male gametes and all female gametes in human and other male-heterogametic species.
A vacuum tube equipped with an electron emitting CATHODE and a fluorescent screen which emits visible light when excited by the cathode ray. Cathode ray tubes are used as imaging devises for TELEVISIONS; COMPUTER TERMINALS; TEXT TELECOMMUNICATION DEVICES; oscilloscopes; and other DATA DISPLAY devices.
Unstable isotopes of fluorine that decay or disintegrate emitting radiation. F atoms with atomic weights 17, 18, and 20-22 are radioactive fluorine isotopes.
The use of combination of imaging techniques or platforms (e.g., MRI SCAN and PET SCAN) encompassing aspects of anatomical, functional, or molecular imaging methods.
Traumatic injuries involving the cranium and intracranial structures (i.e., BRAIN; CRANIAL NERVES; MENINGES; and other structures). Injuries may be classified by whether or not the skull is penetrated (i.e., penetrating vs. nonpenetrating) or whether there is an associated hemorrhage.
The thin serous membrane enveloping the lungs (LUNG) and lining the THORACIC CAVITY. Pleura consist of two layers, the inner visceral pleura lying next to the pulmonary parenchyma and the outer parietal pleura. Between the two layers is the PLEURAL CAVITY which contains a thin film of liquid.
A form of pneumoconiosis caused by inhalation of asbestos fibers which elicit potent inflammatory responses in the parenchyma of the lung. The disease is characterized by interstitial fibrosis of the lung, varying from scattered sites to extensive scarring of the alveolar interstitium.
Either of the pair of organs occupying the cavity of the thorax that effect the aeration of the blood.
Incorrect diagnoses after clinical examination or technical diagnostic procedures.
Hospital department responsible for the administration and provision of immediate medical or surgical care to the emergency patient.
The measurement of radiation by photography, as in x-ray film and film badge, by Geiger-Mueller tube, and by SCINTILLATION COUNTING.
Unstable isotopes of cadmium that decay or disintegrate emitting radiation. Cd atoms with atomic weights 103-105, 107, 109, 115, and 117-119 are radioactive cadmium isotopes.
Inanimate objects that become enclosed in the body.
Individuals responsible for fabrication of dental appliances.
Studies in which individuals or populations are followed to assess the outcome of exposures, procedures, or effects of a characteristic, e.g., occurrence of disease.
Any visual display of structural or functional patterns of organs or tissues for diagnostic evaluation. It includes measuring physiologic and metabolic responses to physical and chemical stimuli, as well as ultramicroscopy.
A subdiscipline of genetics that studies RADIATION EFFECTS on the components and processes of biological inheritance.
High-energy radiation or particles from extraterrestrial space that strike the earth, its atmosphere, or spacecraft and may create secondary radiation as a result of collisions with the atmosphere or spacecraft.
The largest of the TARSAL BONES which is situated at the lower and back part of the FOOT, forming the HEEL.
Diseases caused by factors involved in one's employment.
Quartz (SiO2). A glassy or crystalline form of silicon dioxide. Many colored varieties are semiprecious stones. (From Grant & Hackh's Chemical Dictionary, 5th ed)
Asbestos. Fibrous incombustible mineral composed of magnesium and calcium silicates with or without other elements. It is relatively inert chemically and used in thermal insulation and fireproofing. Inhalation of dust causes asbestosis and later lung and gastrointestinal neoplasms.
Levels within a diagnostic group which are established by various measurement criteria applied to the seriousness of a patient's disorder.
Three-dimensional computed tomographic imaging with the added dimension of time, to follow motion during imaging.
Improvement in the quality of an x-ray image by use of an intensifying screen, tube, or filter and by optimum exposure techniques. Digital processing methods are often employed.
The part of CENTRAL NERVOUS SYSTEM that is contained within the skull (CRANIUM). Arising from the NEURAL TUBE, the embryonic brain is comprised of three major parts including PROSENCEPHALON (the forebrain); MESENCEPHALON (the midbrain); and RHOMBENCEPHALON (the hindbrain). The developed brain consists of CEREBRUM; CEREBELLUM; and other structures in the BRAIN STEM.
Substances used to allow enhanced visualization of tissues.
A chronic systemic disease, primarily of the joints, marked by inflammatory changes in the synovial membranes and articular structures, widespread fibrinoid degeneration of the collagen fibers in mesenchymal tissues, and by atrophy and rarefaction of bony structures. Etiology is unknown, but autoimmune mechanisms have been implicated.
The exposure to potentially harmful chemical, physical, or biological agents that occurs as a result of one's occupation.
Evaluation undertaken to assess the results or consequences of management and procedures used in combating disease in order to determine the efficacy, effectiveness, safety, and practicability of these interventions in individual cases or series.
Radiographic visualization of the body between the thorax and the pelvis, i.e., within the peritoneal cavity.
The ability of some cells or tissues to survive lethal doses of IONIZING RADIATION. Tolerance depends on the species, cell type, and physical and chemical variables, including RADIATION-PROTECTIVE AGENTS and RADIATION-SENSITIZING AGENTS.
Pathologic deposition of calcium salts in tissues.
Tumors or cancer of the LUNG.
A procedure consisting of a sequence of algebraic formulas and/or logical steps to calculate or determine a given task.
Reduction of bone mass without alteration in the composition of bone, leading to fractures. Primary osteoporosis can be of two major types: postmenopausal osteoporosis (OSTEOPOROSIS, POSTMENOPAUSAL) and age-related or senile osteoporosis.
X-ray visualization of the chest and organs of the thoracic cavity. It is not restricted to visualization of the lungs.
Outgrowth of immature bony processes or bone spurs (OSTEOPHYTE) from the VERTEBRAE, reflecting the presence of degenerative disease and calcification. It commonly occurs in cervical and lumbar SPONDYLOSIS.
Breaks in bones.
An oval area in the retina, 3 to 5 mm in diameter, usually located temporal to the posterior pole of the eye and slightly below the level of the optic disk. It is characterized by the presence of a yellow pigment diffusely permeating the inner layers, contains the fovea centralis in its center, and provides the best phototropic visual acuity. It is devoid of retinal blood vessels, except in its periphery, and receives nourishment from the choriocapillaris of the choroid. (From Cline et al., Dictionary of Visual Science, 4th ed)
The second longest bone of the skeleton. It is located on the medial side of the lower leg, articulating with the FIBULA laterally, the TALUS distally, and the FEMUR proximally.
Radiography of the vascular system of the heart muscle after injection of a contrast medium.
A specialized CONNECTIVE TISSUE that is the main constituent of the SKELETON. The principle cellular component of bone is comprised of OSTEOBLASTS; OSTEOCYTES; and OSTEOCLASTS, while FIBRILLAR COLLAGENS and hydroxyapatite crystals form the BONE MATRIX.
Methods of creating machines and devices.
Unstable isotopes of oxygen that decay or disintegrate emitting radiation. O atoms with atomic weights 13, 14, 15, 19, and 20 are radioactive oxygen isotopes.
Unstable isotopes of carbon that decay or disintegrate emitting radiation. C atoms with atomic weights 10, 11, and 14-16 are radioactive carbon isotopes.
The science, art, or technology dealing with processes involved in the separation of metals from their ores, the technique of making or compounding the alloys, the techniques of working or heat-treating metals, and the mining of metals. It includes industrial metallurgy as well as metallurgical techniques employed in the preparation and working of metals used in dentistry, with special reference to orthodontic and prosthodontic appliances. (From Jablonski, Dictionary of Dentistry, 1992, p494)
The first seven VERTEBRAE of the SPINAL COLUMN, which correspond to the VERTEBRAE of the NECK.
Methods and procedures for the diagnosis of diseases of the eye or of vision disorders.
A prediction of the probable outcome of a disease based on a individual's condition and the usual course of the disease as seen in similar situations.
The longest and largest bone of the skeleton, it is situated between the hip and the knee.
Improvement of the quality of a picture by various techniques, including computer processing, digital filtering, echocardiographic techniques, light and ultrastructural MICROSCOPY, fluorescence spectrometry and microscopy, scintigraphy, and in vitro image processing at the molecular level.
Pathological processes of CORONARY ARTERIES that may derive from a congenital abnormality, atherosclerotic, or non-atherosclerotic cause.
The circulation of blood through the BLOOD VESSELS of the BRAIN.
Radiography of the bronchial tree after injection of a contrast medium.
The worsening of a disease over time. This concept is most often used for chronic and incurable diseases where the stage of the disease is an important determinant of therapy and prognosis.
The volume of air that is exhaled by a maximal expiration following a maximal inspiration.
Penetrating electromagnetic radiation emitted when the inner orbital electrons of an atom are excited and release radiant energy. X-ray wavelengths range from 1 pm to 10 nm. Hard X-rays are the higher energy, shorter wavelength X-rays. Soft x-rays or Grenz rays are less energetic and longer in wavelength. The short wavelength end of the X-ray spectrum overlaps the GAMMA RAYS wavelength range. The distinction between gamma rays and X-rays is based on their radiation source.
Descriptive anatomy based on three-dimensional imaging (IMAGING, THREE-DIMENSIONAL) of the body, organs, and structures using a series of computer multiplane sections, displayed by transverse, coronal, and sagittal analyses. It is essential to accurate interpretation by the radiologist of such techniques as ultrasonic diagnosis, MAGNETIC RESONANCE IMAGING, and computed tomography (TOMOGRAPHY, X-RAY COMPUTED). (From Lane & Sharfaei, Modern Sectional Anatomy, 1992, Preface)
Slender processes of NEURONS, including the AXONS and their glial envelopes (MYELIN SHEATH). Nerve fibers conduct nerve impulses to and from the CENTRAL NERVOUS SYSTEM.
The portion of the optic nerve seen in the fundus with the ophthalmoscope. It is formed by the meeting of all the retinal ganglion cell axons as they enter the optic nerve.
The scattering of x-rays by matter, especially crystals, with accompanying variation in intensity due to interference effects. Analysis of the crystal structure of materials is performed by passing x-rays through them and registering the diffraction image of the rays (CRYSTALLOGRAPHY, X-RAY). (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
That portion of the electromagnetic spectrum usually sensed as heat. Infrared wavelengths are longer than those of visible light, extending into the microwave frequencies. They are used therapeutically as heat, and also to warm food in restaurants.
Situations or conditions requiring immediate intervention to avoid serious adverse results.
The distal part of the arm beyond the wrist in humans and primates, that includes the palm, fingers, and thumb.
A synovial hinge connection formed between the bones of the FEMUR; TIBIA; and PATELLA.
Any visible result of a procedure which is caused by the procedure itself and not by the entity being analyzed. Common examples include histological structures introduced by tissue processing, radiographic images of structures that are not naturally present in living tissue, and products of chemical reactions that occur during analysis.
A plant genus in the family PINACEAE, order Pinales, class Pinopsida, division Coniferophyta. They are coniferous evergreen trees with long, flat, spirally arranged needles that grow directly from the branch.
Unanticipated information discovered in the course of testing or medical care. Used in discussions of information that may have social or psychological consequences, such as when it is learned that a child's biological father is someone other than the putative father, or that a person tested for one disease or disorder has, or is at risk for, something else.
LIGHT, it's processes and properties, and the characteristics of materials interacting with it.
Collective name for a group of external MECHANORECEPTORS and chemoreceptors manifesting as sensory structures in ARTHROPODS. They include cuticular projections (setae, hairs, bristles), pores, and slits.
The relative amounts of various components in the body, such as percentage of body fat.
Studies in which the presence or absence of disease or other health-related variables are determined in each member of the study population or in a representative sample at one particular time. This contrasts with LONGITUDINAL STUDIES which are followed over a period of time.
Age as a constituent element or influence contributing to the production of a result. It may be applicable to the cause or the effect of a circumstance. It is used with human or animal concepts but should be differentiated from AGING, a physiological process, and TIME FACTORS which refers only to the passage of time.
Storage-stable glycoprotein blood coagulation factor that can be activated to factor Xa by both the intrinsic and extrinsic pathways. A deficiency of factor X, sometimes called Stuart-Prower factor deficiency, may lead to a systemic coagulation disorder.
A highly vascularized extra-embryonic membrane, formed by the fusion of the CHORION and the ALLANTOIS. It is mostly found in BIRDS and REPTILES. It serves as a model for studying tumor or cell biology, such as angiogenesis and TISSUE TRANSPLANTATION.
An aspect of personal behavior or lifestyle, environmental exposure, or inborn or inherited characteristic, which, on the basis of epidemiologic evidence, is known to be associated with a health-related condition considered important to prevent.
Earth or other matter in fine, dry particles. (Random House Unabridged Dictionary, 2d ed)
Measurement of rate of settling of erythrocytes in anticoagulated blood.
Radiography of blood vessels after injection of a contrast medium.
The amount of mineral per square centimeter of BONE. This is the definition used in clinical practice. Actual bone density would be expressed in grams per milliliter. It is most frequently measured by X-RAY ABSORPTIOMETRY or TOMOGRAPHY, X RAY COMPUTED. Bone density is an important predictor for OSTEOPOROSIS.
Studies which start with the identification of persons with a disease of interest and a control (comparison, referent) group without the disease. The relationship of an attribute to the disease is examined by comparing diseased and non-diseased persons with regard to the frequency or levels of the attribute in each group.
Any detectable and heritable change in the genetic material that causes a change in the GENOTYPE and which is transmitted to daughter cells and to succeeding generations.
Organic compounds that contain technetium as an integral part of the molecule. These compounds are often used as radionuclide imaging agents.
The joint that is formed by the articulation of the head of FEMUR and the ACETABULUM of the PELVIS.
Electron microscopy involving rapid freezing of the samples. The imaging of frozen-hydrated molecules and organelles permits the best possible resolution closest to the living state, free of chemical fixatives or stains.
Studies to determine the advantages or disadvantages, practicability, or capability of accomplishing a projected plan, study, or project.
A single lung lesion that is characterized by a small round mass of tissue, usually less than 1 cm in diameter, and can be detected by chest radiography. A solitary pulmonary nodule can be associated with neoplasm, tuberculosis, cyst, or other anomalies in the lung, the CHEST WALL, or the PLEURA.
The technique that deals with the measurement of the size, weight, and proportions of the human or other primate body.
Unstable isotopes of thallium that decay or disintegrate emitting radiation. Tl atoms with atomic weights 198-202, 204, and 206-210 are thallium radioisotopes.
Clarity or sharpness of OCULAR VISION or the ability of the eye to see fine details. Visual acuity depends on the functions of RETINA, neuronal transmission, and the interpretative ability of the brain. Normal visual acuity is expressed as 20/20 indicating that one can see at 20 feet what should normally be seen at that distance. Visual acuity can also be influenced by brightness, color, and contrast.
Microscopy in which the object is examined directly by an electron beam scanning the specimen point-by-point. The image is constructed by detecting the products of specimen interactions that are projected above the plane of the sample, such as backscattered electrons. Although SCANNING TRANSMISSION ELECTRON MICROSCOPY also scans the specimen point by point with the electron beam, the image is constructed by detecting the electrons, or their interaction products that are transmitted through the sample plane, so that is a form of TRANSMISSION ELECTRON MICROSCOPY.
The visualization of deep structures of the body by recording the reflections or echoes of ultrasonic pulses directed into the tissues. Use of ultrasound for imaging or diagnostic purposes employs frequencies ranging from 1.6 to 10 megahertz.
The evaluation of incidents involving the loss of function of a device. These evaluations are used for a variety of purposes such as to determine the failure rates, the causes of failures, costs of failures, and the reliability and maintainability of devices.
Unstable isotopes of cobalt that decay or disintegrate emitting radiation. Co atoms with atomic weights of 54-64, except 59, are radioactive cobalt isotopes.
Visualization of a vascular system after intravenous injection of a fluorescein solution. The images may be photographed or televised. It is used especially in studying the retinal and uveal vasculature.
A British colony in the western North Atlantic Ocean about 640 miles east southeast of Cape Hatteras, North Carolina. It comprises a group of about 300 islands of which only about 20 are inhabited. It is called also the Bermuda Islands or the Bermudas. It was named for the Spanish explorer Juan Bermudez who visited the islands in 1515. (From Webster's New Geographical Dictionary, 1988, p140 & Room, Brewer's Dictionary of Names, 1992, p61)
Measure of the maximum amount of air that can be expelled in a given number of seconds during a FORCED VITAL CAPACITY determination . It is usually given as FEV followed by a subscript indicating the number of seconds over which the measurement is made, although it is sometimes given as a percentage of forced vital capacity.
A specialized field of physics and engineering involved in studying the behavior and properties of light and the technology of analyzing, generating, transmitting, and manipulating ELECTROMAGNETIC RADIATION in the visible, infrared, and ultraviolet range.
A chronic transmural inflammation that may involve any part of the DIGESTIVE TRACT from MOUTH to ANUS, mostly found in the ILEUM, the CECUM, and the COLON. In Crohn disease, the inflammation, extending through the intestinal wall from the MUCOSA to the serosa, is characteristically asymmetric and segmental. Epithelioid GRANULOMAS may be seen in some patients.
Radiographic visualization of the aorta and its branches by injection of contrast media, using percutaneous puncture or catheterization procedures.
Any type of variation in the appearance of energy output of the sun. (NASA Thesaurus, 1994)
Conditions which produce injury or dysfunction of the second cranial or optic nerve, which is generally considered a component of the central nervous system. Damage to optic nerve fibers may occur at or near their origin in the retina, at the optic disk, or in the nerve, optic chiasm, optic tract, or lateral geniculate nuclei. Clinical manifestations may include decreased visual acuity and contrast sensitivity, impaired color vision, and an afferent pupillary defect.
Narrowing or constriction of a coronary artery.
The practice of sending a patient to another program or practitioner for services or advice which the referring source is not prepared to provide.
A plant species of the genus PINUS that contains isocupressic acid.
The creation and display of functional images showing where the blood is flowing into the MYOCARDIUM by following over time the distribution of tracers injected into the blood stream.
The veins and arteries of the HEART.
Isotopes that exhibit radioactivity and undergo radioactive decay. (From Grant & Hackh's Chemical Dictionary, 5th ed & McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Noninflammatory degenerative disease of the knee joint consisting of three large categories: conditions that block normal synchronous movement, conditions that produce abnormal pathways of motion, and conditions that cause stress concentration resulting in changes to articular cartilage. (Crenshaw, Campbell's Operative Orthopaedics, 8th ed, p2019)
An infant during the first month after birth.
The SKELETON of the HEAD including the FACIAL BONES and the bones enclosing the BRAIN.
Studies in which subsets of a defined population are identified. These groups may or may not be exposed to factors hypothesized to influence the probability of the occurrence of a particular disease or other outcome. Cohorts are defined populations which, as a whole, are followed in an attempt to determine distinguishing subgroup characteristics.
Neurons of the innermost layer of the retina, the internal plexiform layer. They are of variable sizes and shapes, and their axons project via the OPTIC NERVE to the brain. A small subset of these cells act as photoreceptors with projections to the SUPRACHIASMATIC NUCLEUS, the center for regulating CIRCADIAN RHYTHM.
Rate of energy dissipation along the path of charged particles. In radiobiology and health physics, exposure is measured in kiloelectron volts per micrometer of tissue (keV/micrometer T).
Fluid accumulation in the outer layer of the MACULA LUTEA that results from intraocular or systemic insults. It may develop in a diffuse pattern where the macula appears thickened or it may acquire the characteristic petaloid appearance referred to as cystoid macular edema. Although macular edema may be associated with various underlying conditions, it is most commonly seen following intraocular surgery, venous occlusive disease, DIABETIC RETINOPATHY, and posterior segment inflammatory disease. (From Survey of Ophthalmology 2004; 49(5) 470-90)
Care given during the period prior to undergoing surgery when psychological and physical preparations are made according to the special needs of the individual patient. This period spans the time between admission to the hospital to the time the surgery begins. (From Dictionary of Health Services Management, 2d ed)
A technetium imaging agent used to reveal blood-starved cardiac tissue during a heart attack.
The ten-layered nervous tissue membrane of the eye. It is continuous with the OPTIC NERVE and receives images of external objects and transmits visual impulses to the brain. Its outer surface is in contact with the CHOROID and the inner surface with the VITREOUS BODY. The outer-most layer is pigmented, whereas the inner nine layers are transparent.
Measurement of distances or movements by means of the phenomena caused by the interference of two rays of light (optical interferometry) or of sound (acoustic interferometry).
Methods which attempt to express in replicable terms the extent of the neoplasm in the patient.
Unstable isotopes of nitrogen that decay or disintegrate emitting radiation. N atoms with atomic weights 12, 13, 16, 17, and 18 are radioactive nitrogen isotopes.
Radioactive substances added in minute amounts to the reacting elements or compounds in a chemical process and traced through the process by appropriate detection methods, e.g., Geiger counter. Compounds containing tracers are often said to be tagged or labeled. (Hawley's Condensed Chemical Dictionary, 12th ed)
A graphic means for assessing the ability of a screening test to discriminate between healthy and diseased persons; may also be used in other studies, e.g., distinguishing stimuli responses as to a faint stimuli or nonstimuli.
Unstable isotopes of copper that decay or disintegrate emitting radiation. Cu atoms with atomic weights 58-62, 64, and 66-68 are radioactive copper isotopes.
An autosomal recessive genetic disease of the EXOCRINE GLANDS. It is caused by mutations in the gene encoding the CYSTIC FIBROSIS TRANSMEMBRANE CONDUCTANCE REGULATOR expressed in several organs including the LUNG, the PANCREAS, the BILIARY SYSTEM, and the SWEAT GLANDS. Cystic fibrosis is characterized by epithelial secretory dysfunction associated with ductal obstruction resulting in AIRWAY OBSTRUCTION; chronic RESPIRATORY INFECTIONS; PANCREATIC INSUFFICIENCY; maldigestion; salt depletion; and HEAT PROSTRATION.
The range or frequency distribution of a measurement in a population (of organisms, organs or things) that has not been selected for the presence of disease or abnormality.
A noninvasive method for assessing BODY COMPOSITION. It is based on the differential absorption of X-RAYS (or GAMMA RAYS) by different tissues such as bone, fat and other soft tissues. The source of (X-ray or gamma-ray) photon beam is generated either from radioisotopes such as GADOLINIUM 153, IODINE 125, or Americanium 241 which emit GAMMA RAYS in the appropriate range; or from an X-ray tube which produces X-RAYS in the desired range. It is primarily used for quantitating BONE MINERAL CONTENT, especially for the diagnosis of OSTEOPOROSIS, and also in measuring BONE MINERALIZATION.
Examination of the interior of the eye with an ophthalmoscope.
Measurement of the index of refraction (the ratio of the velocity of light or other radiation in the first of two media to its velocity in the second as it passes from one into the other).
Unstable isotopes of gallium that decay or disintegrate emitting radiation. Ga atoms with atomic weights 63-68, 70 and 72-76 are radioactive gallium isotopes.
A non-ionic, water-soluble contrast agent which is used in myelography, arthrography, nephroangiography, arteriography, and other radiological procedures.
A substituted benzamide that has antipsychotic properties. It is a dopamine D2 receptor (see RECEPTORS, DOPAMINE D2) antagonist.
A collection of blood outside the BLOOD VESSELS. Hematoma can be localized in an organ, space, or tissue.
The production of an image obtained by cameras that detect the radioactive emissions of an injected radionuclide as it has distributed differentially throughout tissues in the body. The image obtained from a moving detector is called a scan, while the image obtained from a stationary camera device is called a scintiphotograph.
A membrane in the midline of the THORAX of mammals. It separates the lungs between the STERNUM in front and the VERTEBRAL COLUMN behind. It also surrounds the HEART, TRACHEA, ESOPHAGUS, THYMUS, and LYMPH NODES.
An ocular disease, occurring in many forms, having as its primary characteristics an unstable or a sustained increase in the intraocular pressure which the eye cannot withstand without damage to its structure or impairment of its function. The consequences of the increased pressure may be manifested in a variety of symptoms, depending upon type and severity, such as excavation of the optic disk, hardness of the eyeball, corneal anesthesia, reduced visual acuity, seeing of colored halos around lights, disturbed dark adaptation, visual field defects, and headaches. (Dictionary of Visual Science, 4th ed)
Combination or superimposition of two images for demonstrating differences between them (e.g., radiograph with contrast vs. one without, radionuclide images using different radionuclides, radiograph vs. radionuclide image) and in the preparation of audiovisual materials (e.g., offsetting identical images, coloring of vessels in angiograms).
The outer shorter of the two bones of the FOREARM, lying parallel to the ULNA and partially revolving around it.
The hollow, muscular organ that maintains the circulation of the blood.
The exposure to potentially harmful chemical, physical, or biological agents in the environment or to environmental factors that may include ionizing radiation, pathogenic organisms, or toxic chemicals.
Timing the acquisition of imaging data to specific points in the cardiac cycle to minimize image blurring and other motion artifacts.
Unstable isotopes of iodine that decay or disintegrate emitting radiation. I atoms with atomic weights 117-139, except I 127, are radioactive iodine isotopes.
Behavior of LIGHT and its interactions with itself and materials.
The five long bones of the METATARSUS, articulating with the TARSAL BONES proximally and the PHALANGES OF TOES distally.
Death resulting from the presence of a disease in an individual, as shown by a single case report or a limited number of patients. This should be differentiated from DEATH, the physiological cessation of life and from MORTALITY, an epidemiological or statistical concept.
The ratio of radiation dosages required to produce identical change based on a formula comparing other types of radiation with that of gamma or roentgen rays.
The use of ultrasound to guide minimally invasive surgical procedures such as needle ASPIRATION BIOPSY; DRAINAGE; etc. Its widest application is intravascular ultrasound imaging but it is useful also in urology and intra-abdominal conditions.
The concave interior of the eye, consisting of the retina, the choroid, the sclera, the optic disk, and blood vessels, seen by means of the ophthalmoscope. (Cline et al., Dictionary of Visual Science, 4th ed)
Three-dimensional representation to show anatomic structures. Models may be used in place of intact animals or organisms for teaching, practice, and study.

Computerised tomography of acute traumatic intracranial haematoma: reliability of neurosurgeons' interpretations. (1/28924)

Two neurosurgeons concerned with the emergency management of patients with head injury correctly diagnosed the presence or absence of an acute intracranial haematoma in 97 scans that were presented to them without knowledge of the patients' clinical details. There were no false-positives or false-negatives, although identification of the type of haematoma was not always possible. The impact of the EMI scan on patient management demands new approaches to the care of head injuries.  (+info)

Evaluating cost-effectiveness of diagnostic equipment: the brain scanner case. (2/28924)

An approach to evaluating the cost-effectiveness of high-technology diagnostic equipment has been devised, using the introduction of computerised axial tomography (CAT) as a model. With the advent of CAT scanning, angiography and air encephalography have a reduced, though important, role in investigating intracranial disease, and the efficient use of conventional equipment requires the centralisation of neuroradiological services, which would result in major cash savings. In contrast, the pattern of demand for CAT scanning, in addition to the acknowledged clinical efficiency of the scanner and its unique role in the head-injured patient, ephasies the need for improved access to scanners. In the interest of the patients the pattern of service must change.  (+info)

Comparative efficacy of positron emission tomography with FDG and computed tomographic scanning in preoperative staging of non-small cell lung cancer. (3/28924)

OBJECTIVE: To determine the sensitivity, specificity, and accuracy of positron emission tomography with 2-fluorine-18-fluorodeoxyglucose (PET-FDG) in the preoperative staging (N and M staging) of patients with lung cancer. The authors wanted to compare the efficacy of PET scanning with currently used computed tomography (CT) scanning. MATERIALS AND METHODS: Results of whole-body PET-FDG imaging and CT scans were compared with histologic findings for the presence or absence of lymph node disease or metastatic sites. Sampling of mediastinal lymph nodes was performed using mediastinoscopy or thoracotomy. RESULTS: PET-FDG imaging was significantly more sensitive, specific, and accurate for detecting N disease than CT. PET changed N staging in 35% and M staging in 11% of patients. CT scans helped in accurate anatomic localization of 6/57 PET lymph node abnormalities. CONCLUSION: PET-FDG is a reliable method for preoperative staging of patients with lung cancer and would help to optimize management of these patients. Accurate lymph node staging of lung cancer may be ideally performed by simultaneous review of PET and CT scans.  (+info)

Parametric mapping of cerebral blood flow deficits in Alzheimer's disease: a SPECT study using HMPAO and image standardization technique. (4/28924)

This study assessed the accuracy and reliability of Automated Image Registration (AIR) for standardization of brain SPECT images of patients with Alzheimer's disease (AD). Standardized cerebral blood flow (CBF) images of patients with AD and control subjects were then used for group comparison and covariance analyses. METHODS: Thirteen patients with AD at an early stage (age 69.8+/-7.1 y, Clinical Dementia Rating Score 0.5-1.0, Mini-Mental State Examination score 19-23) and 20 age-matched normal subjects (age 69.5+/-8.3 y) participated in this study. 99mTc-hexamethyl propylenamine oxime (HMPAO) brain SPECT and CT scans were acquired for each subject. SPECT images were transformed to a standard size and shape with the help of AIR. Accuracy of AIR for spatial normalization was evaluated by an index calculated on SPECT images. Anatomical variability of standardized target images was evaluated by measurements on corresponding CT scans, spatially normalized using transformations established by the SPECT images. Realigned brain SPECT images of patients and controls were used for group comparison with the help of statistical parameter mapping. Significant differences were displayed on the respective voxel to generate three-dimensional Z maps. CT scans of individual subjects were evaluated by a computer program for brain atrophy. Voxel-based covariance analysis was performed on standardized images with ages and atrophy indices as independent variables. RESULTS: Inaccuracy assessed by functional data was 2.3%. The maximum anatomical variability was 4.9 mm after standardization. Z maps showed significantly decreased regional CBF (rCBF) in the frontal, parietal and temporal regions in the patient group (P < 0.001). Covariance analysis revealed that the effects of aging on rCBF were more pronounced compared with atrophy, especially in intact cortical areas at an early stage of AD. Decrease in rCBF was partly due to senility and atrophy, however these two factors cannot explain all the deficits. CONCLUSION: AIR can transform SPECT images of AD patients with acceptable accuracy without any need for corresponding structural images. The frontal regions of the brain, in addition to parietal and temporal lobes, may show reduced CBF in patients with AD even at an early stage of dementia. The reduced rCBF in the cortical regions cannot be explained entirely by advanced atrophy and fast aging process.  (+info)

Detection of liver metastases from pancreatic cancer using FDG PET. (5/28924)

We evaluated the potential of the glucose analog [18F]fluorodeoxyglucose (FDG) as a PET tracer for the hepatic staging in 168 patients designated for resective pancreatic surgery. METHODS: Metastatic liver disease was confirmed or excluded during surgery or with CT follow-up for at least 6 mo. Proven metastases were then retrospectively identified on preoperative CT (gold standard). Hepatic PET scans of all patients were interpreted blindly. Any focal FDG uptake was considered malignant. Both proven hepatic metastases and suspicious hepatic PET lesions were then compared, lesion by lesion, with CT. Standardized uptake values (SUV) and tumor-to-liver ratios (T/L) were determined for the most intense lesion of each patient. RESULTS: Sensitivity of FDG PET was 68% (15 of 22 patients). The lesion detection rate was 97% (28 of 29 metastases) for lesions >1 cm and 43% (16 of 37 metastases) for lesions < or = 1 cm. Specificity was 95% (138 of 146 patients). Six of eight patients with false-positive results had marked intrahepatic cholestasis (versus 3 of 15 patients with true-positive lesions), one had an infrahepatic abscess and one had a right basal pulmonary metastasis. The SUV and T/L were 4.6+/-1.4 and 2.3+/-1.1, respectively, for malignant lesions and 4.1+/-1.5 and 1.9+/-0.3, respectively, for false-positive lesions and therefore are of limited value. CONCLUSION: FDG PET provides reliable hepatic staging for lesions >1 cm. False-positive results are associated with the presence of marked intrahepatic cholestasis. For lesions < or = 1 cm, FDG PET can define malignancy in 43% of suspicious CT lesions in the absence of dilated bile ducts.  (+info)

Using vascular structure for CT-SPECT registration in the pelvis. (6/28924)

The authors outline a method for three-dimensional registration of pelvic CT and 111In-labeled monoclonal antibody capromab pendetide (111In MoAb 7E11.C5) images using 99mTc-labeled red blood cell SPECT data. METHODS: This method of CT-SPECT registration relies on the identification of major blood vessels in the CT and 99mTc SPECT images. The vessels are segmented from the image datasets by outlining them on transverse planar slices using a mouse-based drawing tool. Stacking the transverse outlines provides a three-dimensional representation of the vascular structures. Registration is performed by matching the surfaces of the segmented volumes. Dual isotope acquisition of 111In and 99mTc activities provides precise SPECT-SPECT registration so that registration in three dimensions of the 111In MoAb and CT images is achieved by applying the same transformation obtained from the 99mTc SPECT-CT registration. RESULTS: This method provided accurate registration of pelvic structures and significantly improved interpretation of 111In MoAb 7E11.C5 exams. Furthermore, sites of involvement by prostate cancer suggested by the 111In MoAb examination could be interpreted with the bony and soft tissue (nodal) anatomy seen on CT. CONCLUSION: This method is a general clinical tool for the registration of pelvic CT and SPECT imaging data. There are immediate applications in conformal radiation therapy treatment planning for certain prostate cancer patients.  (+info)

Obturator internus muscle abscess in children: report of seven cases and review. (7/28924)

Obturator internus muscle (OIM) abscess is an uncommon entity often mistaken for septic arthritis of the hip. We describe seven children with OIM abscess and review seven previously reported cases. The most common presenting symptoms were hip or thigh pain (14 patients), fever (13), and limp (13). The hip was flexed, abducted, and externally rotated in 11 patients. Magnetic resonance imaging and computed tomography (CT) were diagnostic for OIM abscess in the 14 patients. Associated abscesses were located in the obturator externus muscle (5 patients), psoas muscle (2), and iliac muscle (1). The etiologic agents were Staphylococcus aureus (8 patients), Streptococcus pyogenes (2), Neisseria gonorrhoeae (2), and Enterococcus faecalis (1). Three patients underwent CT-guided percutaneous drainage, and three had surgical drainage. Three patients had ischial osteomyelitis in addition to OIM abscess. The 11 children with uncomplicated OIM abscess were treated for a median of 28 days. All patients had an uneventful recovery.  (+info)

Lymphadenitis due to nontuberculous mycobacteria in children: presentation and response to therapy. (8/28924)

The most common manifestation of infection due to nontuberculous mycobacteria (NTM) in children is cervical lymphadenitis in an otherwise healthy patient. We identified and reviewed 19 cases of proven or presumptive lymphadenitis due to NTM seen at our hospital over the course of 13 months. Nine patients underwent initial surgical excision of involved lymph nodes. Ten children did not have involved lymph nodes excised initially and were treated with macrolide-containing antibiotic regimens. Of these patients, five required subsequent surgical excision and five were cured with combination chemotherapy. Six patients underwent radiographic imaging of the head and neck that revealed asymmetrical adenopathy with ring-enhancing masses but minimal inflammatory stranding of the subcutaneous fat, a finding that may distinguish adenitis caused by NTM from staphylococcal and streptococcal adenitis. Our data suggest that if surgical excision is not considered feasible, antimicrobial therapy for adenitis due to NTM may be beneficial for some patients.  (+info)

We retrospectively compared the acute ASPECTSs on noncontrast CT, CTA source images, and CT perfusion CBV maps from a cohort of confirmed nonlacunar MCA strokes imaged within 3 hours of symptom onset that had angiographic proof of recanalization. There is no prior study, to our knowledge, that has evaluated the accuracy of ASPECTS on all 3 techniques during this early period of hyperacute stroke. Our results confirm the generally accepted notion that in acute cerebral ischemia, regions of hypoattenuation on noncontrast CT and CTA source images and hypoperfusion on CT perfusion CBV maps represent unsalvageable tissue despite reperfusion.19,20 However, in the 3-hour window, CBV appears to be a significantly more sensitive and accurate marker for irreversible ischemic damage. We compared the mean ASPECTS of each CT-based technique and found no difference between the scores on noncontrast CT and CTA source images, but both were different from scores on CT perfusion CBV maps. Compared with the mean ...
PURPOSE: To achieve pathologic correlation in areas of ground-glass attenuation (GGA) in usual interstitialpneumonia(UIP) and, using serial thin-section CT, to observe changes in those lesions. MATERIALS AND METHODS:CT-pathologic correlation was performed at 20 sites of GGA in 18 patients with UIP. Two chest radiologistsassessed serial CT scans, focusing particularly on areas of GGA where open lung biopsy had been performed.Pathologic score of inflammation vs. fibrosis was recorded by two independent lung pathologists. RESULTS: Oninitial CT, GGA appeared as an isolated manifestation at one site, mixed with irregular lines at six, and mixedwith both irregular lines and bronchiectasis/bronchiolectasis at thirteen. Pathologically, those areascorresponded respectively to areas of active inflammation, dominant inflammation, and dominant fibrosis. Theextent of GGA seen on follow-up CT decreased when it was an isolated finding (n=1), and at four of six sites (67%)where it was associated with irregular ...
High resolution CT (HRCT) scanning of the lungs is sensitive for detecting bronchiectasis. Helical CT scanning may also be used but this delivers a higher radiation dose to the patient.
Afterward, high resolution CT of the chest (Figure 2) was done and showed bilateral diffuse ground glass density of the lungs, with centrilobular nodular densit
To evaluate the spectrum, prevalence, and significance of incidental non-cardiac findings (INCF) in patients referred for a non-invasive coronary angiography using a 128-slice multi-detector CT (MDCT). The study subjects included 1,044 patients
TY - JOUR. T1 - Diagnostic value of CT density in patients with diffusely increased FDG uptake in the thyroid gland on PET/CT images. AU - Han, You Mie. AU - Kim, Young Chul. AU - Park, Eun Kyung. AU - Choe, Jae Gol. PY - 2010/7. Y1 - 2010/7. N2 - OBJECTIVE. The purpose of this article is to determine the diagnostic significance of thyroid density as determined by CT in patients with a diffuse hypermetabolic thyroid on PET/CT images. SUBJECTS AND METHODS. One hundred twelve patients were enrolled in this study, and all underwent PET/CT and a thyroid function test between August 2007 and December 2008. The 56 study patients enrolled had visible 18F-FDG uptake in the thyroid, whereas the 56 control subjects had no visible FDG uptake. Maximum standardized uptake values (SUV max), Hounsfield units, thyroid-stimulating hormone levels, free thyroxine levels, and visual assessments of thyroid CT densities (grades 0-2) were evaluated. Analyses were performed to identify variables that differed between ...
We demonstrated significant variability of RAPID CTP-derived ischemic core volumes within different ASPECTS strata, as well as similar strengths of association between ASPECTS≥6 and CTP core ≤50 cc with good clinical outcome in a LVOS cohort that underwent thrombectomy.. NCCT ASPECTS is highly predictive of outcome.12 Importantly, studies have demonstrated that ASPECTS is more accurately determined by CTP as opposed to NCCT or CT angiography.13,14 However, the addition of more radiation, contrast media exposure, and potential treatment delays render the benefits indeterminate. The advantage of RAPID CTP software is the automatization and fast postprocessing, providing consistent and timely quantification of infarcted tissue and an estimation of at-risk tissue volumes. Both methods have been used and validated in recent clinical trials.1-5 The trials with advanced imaging selection techniques demonstrated higher rates of good clinical outcomes but with a potential cost of overselecting ...
TY - JOUR. T1 - Three-dimensional CT angiography with multidetector CT data. T2 - Study optimization, protocol design, and clinical applications in the abdomen. AU - Lawler, Leo P.. AU - Fishman, Elliot K.. PY - 2002/1/1. Y1 - 2002/1/1. N2 - The quality and flexibility of abdominal CT angiograms have been well served by advances in multidetector technology and volume rendering techniques, which allow real-time, interactive modification of high-quality data sets. We have applied this approach to many of the established and developing roles of CT and we discuss and illustrate protocol design and application.. AB - The quality and flexibility of abdominal CT angiograms have been well served by advances in multidetector technology and volume rendering techniques, which allow real-time, interactive modification of high-quality data sets. We have applied this approach to many of the established and developing roles of CT and we discuss and illustrate protocol design and application.. UR - ...
CT Angiogram - MedHelps CT Angiogram Center for Information, Symptoms, Resources, Treatments and Tools for CT Angiogram. Find CT Angiogram information, treatments for CT Angiogram and CT Angiogram symptoms.
TY - JOUR. T1 - Computed tomographic evaluation of canine and feline mediastinal masses in 14 patients. AU - Yoon, Junghee. AU - Feeney, Daniel A. AU - Cronk, Daniel E.. AU - Anderson, Kari L. AU - Ziegler, Laura E.. PY - 2004/11/1. Y1 - 2004/11/1. N2 - A 15-year retrospective analysis of histologically proven canine and feline mediastinal malignancies at the University of Minnesota was conducted to identify patients imaged by computed tomography (CT). The goal of the study was to characterize the CT appearance, to determine if there were any tumor type-specific appearances, and to clarify the role of CT in patients with mediastinal masses. Fourteen patients meeting these criteria were available for evaluation. The masses were characterized based on the presence or absence of contrast enhancement, internal architecture, size, extent of local invasion, the presence of pleural fluid, and the presence of regional vascular invasion. Within the limits of this study and the histopathologic information ...
Definition of Contrast resolution in the Financial Dictionary - by Free online English dictionary and encyclopedia. What is Contrast resolution? Meaning of Contrast resolution as a finance term. What does Contrast resolution mean in finance? ดูแลรักษาโดยและเป็นของ น.พ.รัฐชัย แก้วลาย. โลโก้ เป็นลิขสิทธิ์ของ น.พ.รัฐชัย แก้วลาย. ข้อมูลส่วนตัวของคุณถือเป็นความลับและจะไม่ถูกเผยแพร่ไปยังบุคคลที่สาม. ข้อมูลใน ใช้เป็นแนวทาง, ไม่ใช่เพื่อทดแทน, การให้การวินิจฉัย, รักษาและคำแนะนำสำหรับผู้ป่วย. แพทย์ของคุณอาจให้คำแนะนำในการวินิจฉัยหรือรักษาเป็นอย่างอื่นขึ้นกับข้อมูลและสถานการณ์นั้นๆ. ...
Todays Tuesday Tip is a video on MRI of the Spine and Facet Cysts and in particular the MRI and CT appearance of Spine Facet Cysts.. This approx 5 minute video below looks at What do spine facet cysts look like on MRI and CT.. If you find the video helpful, please subscribe to the channel.. ...
CAT SCAN; CT SCAN CAT or CT Scan are abbreviations for the same diagnostic test. Computed Tomography (CT) scan or Computerized Axial Tomography (CAT) is a specialized xray that looks at structures of the body from several different angles. A computer is used to produce a 3-dimensional picture called a tomogram. CT provides a look at the structures from several different positions. Each view produces a separate image called a slice. CT is very good at picking up blood and fluid collections, and plays a major role in helping to diagnose problems. A CT can be done to look at almost any structure of the body. CT of the head, chest or abdomen are the most common types of CAT scans done in the critical care unit. They provide quick information that helps to identify multiple injuries following major trauma. A special xray dye (called contrast) can be injected during CT if the doctors want to look specifically at the blood vessels. This can help to identify bleeding from a blood vessel. When contrast ...
What does a brain ct scan show - Would a CT scan show cysts in the brain? If so, would a dr mention them if seen during a brain CT scan after a head injury from a car accident? It would. Ct scans of the brain can provide detailed information about brain pathology, thus providing more information related to injuries and/or diseases of the brain. Findings could bleeding, brain injury and skull fractures in patients with head injuries. However, MRI will be more precise for details of soft tissue.
A CT angiogram is a less invasive test than a standard angiogram. A standard angiogram involves threading a thin tube called a catheter through an artery in your arm or leg up to the area being studied. But with a CT angiogram, no tubes are put in your body. To learn more, see the topic Angiogram.. If your doctor sees that one or more of your blood vessels are narrowed or blocked, you may need a standard angiogram anyway to double-check the abnormal results from the CT angiogram. This is more likely to happen if your doctor is considering surgery to treat the narrowing or blockage.. If your doctor finds a major blockage in one of your blood vessels during a CT angiogram, you wont be able to get an immediate angioplasty to clear the blockage. You will need a separate procedure. But if you have a standard angiogram and the doctor finds a major blockage, he or she can perform an angioplasty during the angiogram.. ...
A CT angiogram is a less invasive test than a standard angiogram. A standard angiogram involves threading a thin tube called a catheter through an artery in your arm or leg up to the area being studied. But with a CT angiogram, no tubes are put in your body. To learn more, see the topic Angiogram.. If your doctor sees that one or more of your blood vessels are narrowed or blocked, you may need a standard angiogram anyway to double-check the abnormal results from the CT angiogram. This is more likely to happen if your doctor is considering surgery to treat the narrowing or blockage.. If your doctor finds a major blockage in one of your blood vessels during a CT angiogram, you wont be able to get an immediate angioplasty to clear the blockage. You will need a separate procedure. But if you have a standard angiogram and the doctor finds a major blockage, he or she can perform an angioplasty during the angiogram.. ...
World Literature is an exciting way to prepare for the multicultural classrooms of the 21st century. The BC College of Teachers recognizes World Literature as a teachable subject for high school. World Literature also fulfills the English requirement for elementary teachers.. You are strongly encouraged to attend an orientation for teachers, offered through the Faculty of Education. For date information, please visit the website for the Faculty of Education. Any questions that pertain to teaching can be directed to the Faculty of Education advisor, Jacquie Breadon.. ...
TY - JOUR. T1 - Image quality and radiation dose of renal perfusion CT with low-dose contrast agent. T2 - a comparison with conventional CT using a 320-row system. AU - Asayama, Yoshiki. AU - Nishie, Akihiro. AU - Ishigami, K.. AU - ushijima, yasuhiro. AU - Kakihara, Daisuke. AU - Fujita, N.. AU - Morita, K.. AU - Ishimatsu, K.. AU - Takao, S.. AU - Honda, Hiroshi. PY - 2019/8/1. Y1 - 2019/8/1. N2 - AIM: To compare perfusion computed tomography (CT) with reconstructed image from source data using low-dose contrast agent and conventional 320-row CT for the evaluation of renal tumours. MATERIALS AND METHODS: Twenty-eight patients underwent conventional CT (C-CT) and 26 patients underwent perfusion CT with low-dose (40 ml) contrast agent. Image noise, arterial visualisation, the sharpness of the corticomedullary junction (CMJ), and overall image quality were each assessed using a four-point scale. The tumour detection rate for lesions ,4 cm (n=66) was also evaluated. Quantitative image parameters ...
Purpose: To assess knowledge about the degree of radiation dose related to routine CT examinations among local medical staff and patients. Materials and Methods: A retrospective study was conducted in a major public hospital by administering a questionnaire survey to both, the medical staff and the patients with regard to their knowledge about the radiation dosage associated with routine CT examinations. Two types of surveys were designed for the two groups of participants. The first group of participants included the medical staff, which consisted of Physicians, Radiologists, and Medical Imaging Technologists (MITs). A number of well-structured questions were developed to detect their knowledge about radiation dosage associated with CT scans. The second group included patients who were referred for CT examinations of different body regions. They were administered a questionnaire survey with questions designed to discover whether they had been provided the relevant information about CT ...
(KudoZ) French to English translation of scanner dévaluation: follow-up CT scan [Cancer Treatment - Medical (general) (Medical)].
Ct Brain Images Anatomy - anatomy of the brain ct images, ct anatomy of brain images, ct brain images anatomy, ct images of normal brain anatomy, ct images of the brain with anatomy, ct scan brain images anatomy
The CT (Computed Tomography) scan or the CAT (Computer-Aided Tomography) scan is a diagnostic procedure that takes a detailed cross-sectional x-ray picture of a slice of the body.. To get a CT scan, the patient lies very still on a table, which is slowly moved horizontally while the x-ray machine rotates around the patient and takes pictures from many angles. A computer then combines the pictures into a very detailed cross-sectional image. The length of the procedure depends on the areas to be x-rayed. For the chest area, the procedure takes about 20 seconds.. CT scans can show the shape, size and the exact location of organs and tissues in any slice of the body more clearly than other diagnostic tools. This technique can help find enlarged lymph nodes, which might contain cancer that has spread from the lung. CT scans are more sensitive than routine chest x-rays in finding early lung cancers. CT scans are also used in detecting masses in the liver, adrenal glands, brain and other internal ...
Computed Tomography (CT or CAT) Scan of the Spine What is a CT scan of the spine? Computed tomography is an imaging test that uses X-rays and a computer to make detailed images of the body. A CT scan shows details of the bones, muscles, fat, and organs. CT scans are more detailed than standard X-rays. In standard X-rays, a beam of energy is aimed at the body part being studied. A plate behind the body part captures the variations of the energy beam after it passes through skin, bone, muscle, and other t...
Clinico-demographic profile and comparative assessment of ultrasonography and computed tomography examination in the diagnosis of urinary tract infections
Viral hepatitis Acute viral hepatitis may be caused by one of several viruses: A, B, C, D or E. The viruses which cause hepatitis B, C an ...
Question - Suffering with paralysis, right leg affected, difficulty in standing, normal CT scan, undergoing physiotherapy. Advice?, Ask a Neurologist
A CAT scan or computerized axial tomography is a technique of examining a mass of the body. It allows an individual to see the 3D images of the mass. A CAT scan helps in diagnosing various parts of the body and allows us to see if there are any cranial bleeds or tumor. CAT scan gives more information than regular X-rays which are 2D.The CAT scan procedure tends to be completely painless, however a person needs to lie still for a certain period of time. The patient may have to fast for up to four to six hours depending on the area to be scanned ...
Three axial non-contrast CT images of the abdomen demonstrating a large hyperdense, heterogeneous mass at the left lateral abdominal wall consistent with hemorr
Give students literature selections that will also help them learn about the basic components of literature. This grade 10 textbook features interesting stories and poems from world literature. Categories are arranged by literary devices before moving on to excerpts in historical sequence, helping students to think through the history of ideas from a Christian perspective; units include aspiration, Greece, the Modern Age, paradox, and suspense & mystery. Descartes, Robert Frost, Rossetti, Emily Dickinson, and others are among the prominent authors represented. Lessons included bolded & defined vocabulary words, as well as end-chapter questions. Approximately 453 pages. 10th grade. Abeka World Literature
High resolution CT (HRCT) is normally done with thin section with skipped areas between the thin sections and is mainly useful to detect abnormalities of lung. Pulmonary angiogram - (CTPA) is a medical diagnostic test used to diagnose pulmonary embolism (PE). It employs computed tomography to obtain an image of the pulmonary arteries. Abdominal and pelvic -CT is a sensitive method for diagnosis of abdominal diseases. It is used frequently to determine stage of cancer and to follow progress. It is also a useful test to investigate acute abdominal pain (especially of the lower quadrants, whereas ultrasound is the preferred first line investigation for right upper quadrant pain). Renal stones, appendicitis, pancreatitis, diverticulitis, abdominal aortic aneurysm, and bowel obstruction are conditions that are readily diagnosed and assessed with CT. It is also the first line for detecting solid organ injury after trauma. Extremities - CT is often used to image complex fractures, especially ones ...
The purpose of this study was to analyse the diagnostic value of cerebral CT angiography (CTA) and CT perfusion (CTP) examinations in the detection of acute stroke based on a systematic review of the current literature. The review was conducted based on searching of seven databases for articles published between 1993 and 2013. Diagnostic value in terms of sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV) and accuracy was analysed from 21 articles which were found to meet selection criteria. The mean sensitivity, specificity, PPV, NPV and accuracy for CTA were significantly higher than those for CTP with 83.2% (95% CI: 57.9-100.0%), 95.0% (95% CI: 74.4-100%), 84.1% (95% CI: 50.0-100%), 97.1 (95% CI: 94.0-100%) and 94.0% (95% CI: 83.0-99.0) versus 69.9% (95% CI: 20.0-97.0%), 87.4 (95% CI: 61.0-100.0%), 76.4% (95% CI: 48.0-95.4%), 78.2% (95% CI: 55.8-93.9%) and 89.8% (95% CI: 75.7-97.1%), respectively. This analysis shows that CTA has high diagnostic value ...
Computerized tomography (CT scan) is a procedure that assists in diagnosing tumors, fractures, bony structures, and infections in the organs and tissues of the body. The procedure is also known as computed axial tomography (CAT scan).
OBJECTIVE: The hypodense sign (HyS) on CT imaging is highly suggestive of pulmonary invasive mould disease (IMD) in patients with haematological malignancies, but its diagnostic utility has not been systematically evaluated on contrast-enhanced CT. The objective of this study was to compare the diagnostic performance of the HyS to other common CT findings in a cohort of haematology patients with proven, probable or possible IMD based on EORTC/MSG criteria. METHODS: We analyzed the diagnostic performance of the HyS to other common CT signs among 127 neutropenic patients with haematological malignancies submitted to both noncontrast-enhanced and contrast-enhanced CT scans of the lungs, including CT pulmonary angiography (CTPA ...
Computed tomography (CT or CAT scan) is a noninvasive diagnostic imaging procedure that uses a combination of x-rays and computer technology to produce cross-sectional images (often called slices), both horizontally and vertically, of the body. A CT scan shows detailed images of any part of the body, including the bones, muscles, fat, and organs. CT scans are more detailed than standard x-rays.. In standard x-rays, a beam of energy is aimed at the body part being studied. A plate behind the body part captures the variations of the energy beam after it passes through skin, bone, muscle, and other tissue. While much information can be obtained from a standard x-ray, a lot of detail about internal organs and other structures is not available.. In computed tomography, the x-ray beam moves in a circle around the body. This allows many different views of the same organ or structure. The x-ray information is sent to a computer that interprets the x-ray data and displays it in a two-dimensional (2D) ...
A 72 year old man attended for follow up computed tomography (CT) of a chronic type A aortic dissection, three years on from his original presentation. The contrast enhanced multislice CT was acquired using retrospective ECG gating. Subsequent reconstruction of the CT images was from a diastolic reconstruction window centred at 75% of the RR interval. This mode of acquisition provided images of the thoracic aorta free of motion artefact. The chronic dissection flap could clearly be seen arising in the proximal, aneurysmal ascending aorta (panel A, axial CT section), extending to the head and neck vessels (panel B, sagittal CT section), and progressing distally to the descending aorta (panel C, three dimensional reconstruction in sagittal section). Advanced post-processing using volume rendering techniques demonstrated the dissection (panel C) and the aneurysm (panel D) in three dimension.. Aortic motion artefact is the most common cause of false positive detection of dissection of the ...
New York-presbyterian Hospital/weill Cornell Medical procedure pricing information for a Brain CT Scan can be found listed below. Find a cost comparison to other providers in New York, NY and see your potential savings.
Impact of contrast CT angiography and whole brain contrast CT perfusion study on the accuracy of cerebrovascular diagnosis in patients presenting with a major stroke-like syndrome. Stroke. 2001; 32(1):325 ...
Our study shows that Hounsfield unit quantification of thrombus in CTA-proved MCA proximal occlusion can predict the success of intravenous rtPA recanalization. Although significant differences were noted when absolute thrombus and contralateral Hounsfield unit values were analyzed, rHU was the strongest predictor of recanalization. Specifically, a cutoff of rHU , 1.382 derived by ROC analysis was associated with nonrecanalization after intravenous rtPA treatment in acute ischemic stroke. This method might be useful for rapid triage of patients for thrombolytic therapy to decide which patients should undergo endovascular rescue therapy.. Our findings are in good agreement with those of Kim et al,13 who found that CT-based measurement of Hounsfield units may be helpful in predicting the effectiveness of thrombolytic therapy. Hemoglobin determines the attenuation of a clot, and lysability appears to increase with increasing hematocrit levels, suggesting that the composition of the thrombus ...
Computed tomography (CT) systems use a series of X-ray images to create an image volume dataset with slices that can be manipulated on any plane using advanced visualization software. The section includes computed tomography scanners, CT contrast agents, CT angiography (CTA and CCTA), CT perfusion, spectral CT (dual-source CT), and iterative reconstruction dose reduction
Computed tomography coronary angiography (CTA) is a newly developed technique for non-invasive evaluation of coronary artery disease. A CT scan is an X-ray procedure that, combined with iodine-based contrast agents, generates cross sectional views of the heart and coronary arteries.. At the Emory Cardiac Imaging Center, we use a state-of-the-art multi-detector CT system to acquire high-resolution images of the heart and great vessels. This advanced technology is being used more and more to identify calcified and non-calcified plaques in the coronary arteries and to exclude the possibility of stenosis due to atherosclerosis. Early stages of coronary atherosclerosis can be detected before the development of coronary arterial narrowing.. ...
Meziane, M.A.; Fishman, E.K.; Siegelman, S.S., 1984: CT diagnosis of hemopericardium in acute dissecting aneurysm of the thoracic aorta
In this paper, we propose a robust 3D rigid registration technique for detecting cerebral aneurysms, arterial stenosis, and other vascular anomalies in a brain CT angiography. Our method is composed o
Question - Having horrible pain and swelling in lung area. Suffer pain. Suggested small nodules in lungs. What should I do?. Ask a Doctor about diagnosis, treatment and medication for Pleural effusion, Ask a General & Family Physician
By Michael H. Crawford, MD Professor of Medicine, Chief of Clinical Cardiology, University of California, San Francisco Dr. Crawford reports no financial relationships relevant to this field of study. SYNOPSIS: Coronary calcium scan on standard CT scans performed for other indications is of equivalent prognostic value to that seen on ECG-gated coronary studies and should be included in radiology test reports. SOURCES: Hughes-Austin JM, Dominguez A 3rd, Allison MA, et al. Relationship of coronary calcium on standard chest CT scans with mortality. JACC Cardiovasc Imaging . . .
Contrast-enhanced multidetector-row computed tomography (MDCT) is now capable of providing high-quality noninvasive views of cardiac anatomy and instant noninvasive coronary angiography. With current generation 64-slice scanners, MDCT can be performed in most patients with minimal patient discomfort and high diagnostic accuracy. MDCT may obviate the need for invasive diagnostic angiography in patients with borderline symptoms or equivocal noninvasive testing. It is useful in assessing the symptomatic patient postrevascularization and in emergency room triage in selected patients with chest pain. Calcified vessels are still difficult to assess, as is the accurate evaluation of implanted coronary stents. The volume of contrast material required for proper opacification limits the use of MDCT in patients with renal dysfunction, but newer emerging technologies will greatly improve these disadvantages in the near future. MDCT is expected to become an integral part of our diagnostic armamentarium in the
{ consumer: A computed tomography (CT) scan uses X-rays to make detailed pictures of structures inside of the body. During the test, you will lie on a table that is attached to the CT scanner, which is a large doughnut-shaped machine. The CT scanner sends X-rays through the body area being studied. Each rotation of the scanner..., clinical: A computed tomography (CT) scan uses X-rays to make detailed pictures of structures inside of the body. During the test, you will lie on a table that is attached to the CT scanner, which is a large doughnut-shaped machine. The CT scanner sends X-rays through the body area being studied. Each rotation of the scanner... } Butte County, California
This is a trial designed to test if a treatment, losartan, may decrease the progression of Chronic Obstructive Pulmonary Disease (COPD). Losartan is an angiotensin receptor blocking agent, commonly used as an antihypertensive agent, which has been shown to alter cardiac remodeling after myocardial infarction and renovascular remodeling in diabetes-mellitus. In this trial participants with mild to severe COPD, with Computed Tomography (CT) evidence of emphysema (5-35% of voxels with , -950 Hounsfield Units), will be randomly assigned to receive 100mg/day of losartan or placebo for 48 weeks. The primary outcome measure will be the rate of progression of emphysema, quantified as the percent of lung voxels with a density less than -950 HU as measured by High Resolution CT (HRCT, from baseline to 48 weeks.. ...
Objective:To analyze CT appearances of malignant liver tumors after local electromagnetic wave thermal ablation microwave thermal ablation (MTA) or radiofrequency ablation (RFA).Methods:CT scans were performed for twenty-six patients with malignant liver tumors 2 weeks after local electromagnetic wave thermal ablation.The examination was repeated within 3 months.CT features of liver morphological changes and of local complications after the thermal ablation were analyzed,combined with clinical symptoms and lab dada.Results:In 18 cases without abnormal changes,the first postoperative CT scan 2 weeks after the thermal ablation showed well-outlined low density area which appeared bigger than the original size of the tumors,and there was no enhancement in the area.The margin of the low density area showed a faint rim-like enhancement.After a few months,the low density area became smaller and its size was similar to that of the original tumor,the rim-like enhancement of the margin faded gradually and
TY - JOUR. T1 - Computed tomography evaluation of right heart dysfunction in patients with acute pulmonary embolism. AU - He, Hongying. AU - Stein, Marjorie W.. AU - Zalta, Benjamin. AU - Haramati, Linda B.. PY - 2006/3/1. Y1 - 2006/3/1. N2 - Purpose: To evaluate the role of qualitative assessment of right heart dysfunction on multidetector computed tomography (CT) in patients with acute pulmonary embolism. Methods: Seventy-four consecutive adults with pulmonary embolism diagnosed on multidetector nongated CT were identified between July 2002 and March 2004. There were 47 women and 27 men, with a mean age of 62 years. Each CT scan was jointly reviewed by 2 of 3 reviewers in consensus. The CT scans were qualitatively assessed for dilatation of the right ventricle and the position of the interventricular septum. Scans were considered positive for right heart dysfunction if, on visual integration of multiple axial images, the right ventricle was dilated or the interventricular septum was ...
Synonyms for computed axial tomography at with free online thesaurus, antonyms, and definitions. Dictionary and Word of the Day.
TY - GEN. T1 - A fixed-point model for pancreas segmentation in abdominal CT scans. AU - Zhou, Yuyin. AU - Xie, Lingxi. AU - Shen, Wei. AU - Wang, Yan. AU - Fishman, Elliot K. AU - Yuille, Alan L.. PY - 2017. Y1 - 2017. N2 - Deep neural networks have been widely adopted for automatic organ segmentation from abdominal CT scans. However, the segmentation accuracy of some small organs (e.g., the pancreas) is sometimes below satisfaction, arguably because deep networks are easily disrupted by the complex and variable background regions which occupies a large fraction of the input volume. In this paper, we formulate this problem into a fixed-point model which uses a predicted segmentation mask to shrink the input region. This is motivated by the fact that a smaller input region often leads to more accurate segmentation. In the training process, we use the ground-truth annotation to generate accurate input regions and optimize network weights. On the testing stage, we fix the network parameters and ...
Global Spectral Computed Tomography (CT) Market By Product Type (Spiral CT, Electron Beam Tomography) And By End-Users/Application (Pharmaceutical Industries, Research and Development) Global Market Share, Forecast Data, In-Depth Analysis, And Detailed Overview, and Forecast, 2013 - 2026
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July 20, 2010 - New dual source CT technology allows a radiation dose of as low as one millisievert (mSv) for computed tomography angiography (CTA) scans, Siemens announced last week at the 2010 Annual Scientific Meeting of the Society of Cardiovascular Computed Tomography (SCCT) in Las Vegas. At SCCT, Somatom Definition Flash CT scanner users also showed how they use the system to display the coronary vessels, as well as the aorta, within one scan. Recently, cardiologists have been using the Somatom Definition Flash to plan the procedure for one of the newest therapy methods for valvular heart disease: transcatheter aortic valve implantation (TAVI). Prior to this minimally invasive intervention, physicians had to examine the hearts anatomy closely. This demand is also supported by the cardiovascular CT applications of the imaging software syngo.via. With automated processes, these applications can spare the cardiologists many manual steps that before were necessary - for instance, to measure ...
A prospective abnormal shadow detecting system detects a prospective abnormal shadow in an image on the basis of image data representing the image and outputs information on the prospective abnormal shadow detected by the prospective abnormal shadow detecting means. Whether the detected prospective abnormal shadow is malignant or benignant is judged, and the information on the prospective abnormal shadow is output in such a manner that whether the prospective abnormal shadow is malignant or benignant can be distinguished.
TY - JOUR. T1 - Measuring noncalcified coronary atherosclerotic plaque using voxel analysis with MDCT angiography. T2 - A pilot clinical study. AU - Clouse, Melvin E.. AU - Sabir, Adeel. AU - Yam, Chun Shan. AU - Yoshimura, Norihiko. AU - Lin, Shezhang. AU - Welty, Francine. AU - Martinez-Clark, Pedro. AU - Raptopoulos, Vassilios. PY - 2008/6/1. Y1 - 2008/6/1. N2 - OBJECTIVE. The purpose of our study was to evaluate a new method using voxel analysis for quantifying noncalcified plaque in coronary arteries using MDCT angiography (MDCTA) compared with luminal stenosis by catheter coronary arteriography. MATERIALS AND METHODS. Forty-one normal and eight abnormal arterial cross sections with noncalcified plaque selected from 40 patients undergoing MDCTA were analyzed for percentage of stenosis and plaque volume using a voxel analysis technique. RESULTS. Using voxel analysis, the normal arterial wall thickness was determined to be 0.8 ± 0.4 mm. Attenuation values (in Hounsfield units) for normal ...
The demonstration of cerebral oedema by computerised axial tomography (CAT) in patients with migraine was drawn to our attention by Drs J Ambrose and J Gawler of London. The subsequent unexpected finding of a significant degree of cerebral atrophy in a migraine sufferer further prompted our interest in the CAT changes in these patients. The findings in 46 patients with migrainous headaches were therefore reviewed.. ...
Our direct, intraindividual head-to-head comparison in the same patient population shows that compared with a routine radiation dose FBP protocol, a 50% reduced radiation dose image acquisition using IR preserves image quality and, more importantly, diagnostic accuracy at coronary CTA. These findings illustrate the potential of substantial radiation dose reduction across the population for coronary CTA studies, enabled by a reduced tube current-time product when iteratively reconstructed, without jeopardizing the diagnostic yield of the examination.. Since its inception, radiation doses associated with noninvasive coronary CTA had risen with each new generation of multidetector-row CT systems and had reached its zenith with the launch of the first-generation 64-slice scanners in the year 2004. With these platforms, radiation doses from coronary CTA were reported to be as high as approximately 30 mSv, with an estimated median of approximately 12 mSv (15). Since then, vigorous efforts have been ...
Objective : To investigate the cases of intracranial abnormal brain MRI findings even in the negative brain CT scan after mild head injury. Methods : During a 2-year period (January 2009-December 2010), we prospectively evaluated both brain CT and brain MRI of 180 patients with mild head injury. Patients were classified into two groups according to presence or absence of abnormal brain MRI finding even in the negative brain CT scan after mild head injury. Two neurosurgeons and one neuroradiologist validated the images from both brain CT scan and brain MRI double blindly. Results : Intracranial injury with negative brain CT scan after mild head injury occurred in 18 patients (10.0%). Headache (51.7%) without neurologic signs was the most common symptom. Locations of intracranial lesions showing abnormal brain MRI were as follows; temporal base (n=8), frontal pole (n=5), falx cerebri (n=2), basal ganglia (n=1), tentorium (n=1), and sylvian fissure (n=1). Intracranial injury was common in patients ...
Abdominal CT scans that include the lumbar spine but that are performed for other purposes may help identify patients with osteoporosis.
Define Computed Tomography, Pituitary. Computed Tomography, Pituitary synonyms, Computed Tomography, Pituitary pronunciation, Computed Tomography, Pituitary translation, English dictionary definition of Computed Tomography, Pituitary. n. Computerized axial tomography. Noun 1. computed axial tomography - a method of examining body organs by scanning them with X rays and using a computer to...
According to an article in the German Medical Journal Deutsches Ärzteblatt Jg.117 Heft 14 3. April 2020 the Munich Hospital Rechts der Isar started a new and simple scheme for COVID-19 detection: Patients with a history of fever or temperature >37.3°C / 99.1°F and a lymphocyte count ,1,1 G/L get an immediate low-dose chest CT scan. This procedure is referenced to the Therapeutic and triage strategies for 2019 novel coronavirus disease in fever clinics published recently in Lancet online at The sensitivity of laboratory PCR tests is low according to the study and laboratory results may last for up to 3 days. A chest CT scan takes a few minutes, and the result is available shortly later. Any detected viral pneumonia in a chest CT scan indicates a COVID-19 infection after exclusion of influenza or RSV. Chest CT scans shall be typically acquired in low dose technique without contrast agent with a slice thickness of ...
Fingerprint Dive into the research topics of Re: Unenhanced computerized axial tomography to detect retained calculi after percutaneous ultrasonic lithotripsy. Together they form a unique fingerprint. ...
Mucocele of the petrous apex is very rare, only three cases having been reported. Since this area is inaccessible to direct examination, imaging, preferably high resolution computed tomography (HR...
Care guide for Cardiac Computerized Axial Tomography (Inpatient Care). Includes: possible causes, signs and symptoms, standard treatment options and means of care and support.
Learn about abdominal CT scans and how they're used by doctors for intestinal transplant patients at UPMC Children's Hospital of Pittsburgh.
Abdominal CT Scan clinics in Bucharova at the best price. Find doctors, specialized in Diagnostic Imaging and compare prices, costs and reviews.
Maximum intensity projections reconstructions from 2.5 mm unenhanced multidetector computed tomography axial slices were obtained from 49 patients within the first 6 h of anterior-circulation cerebral strokes to identify different patterns of the dense artery sign and their prognostic implications for location and extent of the infarcted areas. The dense artery sign was found in 67.3% of cases. Increased density of the whole M1 segment with extension to M2 of the middle cerebral artery was associated with a wider extension of cerebral infarcts in comparison to M1 segment alone or distal M1 and M2. A dense sylvian branch of the middle cerebral artery pattern was associated with a more restricted extension of infarct territory. We found 62.5% of patients without a demonstrable dense artery to have a limited peripheral cortical or capsulonuclear lesion. In patients with a 7-10 points on the Alberta Stroke Early Programme Computed Tomography Score and a dense proximal MCA in the first hours of ictus ...
Quantitative computed tomography features and clinical manifestations associated with the extent of bronchiectasis in patients with moderate-to-severe COPD So Hyeon Bak,1 Soohyun Kim,2 Yoonki Hong,3 Jeongwon Heo,4 Myoung-Nam Lim,5 Woo Jin Kim3 1Department of Radiology, School of Medicine, Kangwon National University, Chuncheon, Repubilc of Korea; 2Department of Radiology, Kangwon National University Hospital, Chuncheon, Republic of Korea; 3Department of Internal Medicine, School of Medicine, Kangwon National University, Chuncheon, Republic of Korea; 4Department of Internal Medicine and Environmental Health Center, Kangwon National University Hospital, Chuncheon, Republic of Korea; 5Data Analysis Center, Kangwon National University, Chuncheon, Republic of Korea Background: Few studies have investigated the quantitative computed tomography (CT) features associated with the severity of bronchiectasis in COPD patients. The purpose of this study was to identify the quantitative CT features and clinical
All patients were scanned with a 64-slice CT scanner (Sensation 64, Siemens) equipped with a new feature in multislice CT technology, so-called z-axis flying-focus technology.13 The central 32 detector rows acquire 0.6-mm slices, and the flying-focus spot switches back and forth between 2 z positions between each reading. Two slices per detector row are acquired, which results in a higher oversampling rate in the z axis, thereby reducing artifacts related to the spiral acquisition and improving spatial resolution down to 0.4 mm3.13 Angiographic scan parameters included the following: number of slices per rotation, 32×2; individual detector width, 0.6 mm; rotation time, 330 ms; table feed, 3.8 mm per rotation; tube voltage, 120 kV; tube current, 900 mA; and prospective x-ray tube modulation, none. Calcium scoring parameters (similar unless indicated) were a tube current of 150 mA and prospective x-ray tube modulation. The radiation exposure for CT coronary angiography with this scan protocol was ...
TY - JOUR. T1 - DualTrack technology improves optical coherence tomography angiography image quality. AU - De Vitis, Luigi Antonio. AU - Sacconi, R. AU - Carnevali, Adriano. AU - Centoducati, Teresa. AU - Cavalleri, M.. AU - Querques, L. AU - Bandello, F. AU - Querques, G. PY - 2017. Y1 - 2017. N2 - BACKGROUND AND OBJECTIVE: To evaluate the effects of DualTrack Motion Correction Technology on the performance of AngioVue optical coherence tomography angiography (Optovue, Freemont, CA). PATIENTS AND METHODS: Fifty subjects underwent two consecutive examinations with AngioVue. The operator inactivated the eye-tracking (ET) technology before the second examination. Two operators measured execution time, excluded low-quality images, and counted the number of motion artifacts per image. RESULTS: The mean execution time was lower without ET in all the groups (P , .05), regardless of retinal diseases. Percentages of available images and low-quality images were 75.0% and 25.0%, respectively, with ET and ...
TY - JOUR. T1 - Thin-section computed tomography findings of lung adenocarcinoma with inherent metastatic potential. AU - Suzuki, Shigeki. AU - Aokage, Keiju. AU - Yoshida, Junji. AU - Ishii, Genichiro. AU - Matsumura, Yuki. AU - Haruki, Tomohiro. AU - Hishida, Tomoyuki. AU - Nagai, Kanji. PY - 2016/9/22. Y1 - 2016/9/22. N2 - Purpose: The solid component of lung ground-glass nodules on thin-section computed tomography (TSCT) reflects cancer cell progression and invasiveness. The purpose of this study was to clarify the cut-off value of preoperative TSCT findings in treating a lesion suspected of being adenocarcinoma and to recognize the timing of surgical resection for lung nodules. Methods: We reevaluated the TSCT findings in 392 patients with clinical stage IA lung adenocarcinoma who underwent surgical resection between 2003 and 2007. We identified the clinical parameters that were most useful for predicting recurrence and identified a cut-off level for each parameter. Results: Recurrence was ...
Abstract: Ischemic stroke lesion segmentation from Computed Tomography Perfusion (CTP) images is important for accurate diagnosis of stroke in acute care units. However, it is challenged by low image contrast and resolution of the perfusion parameter maps, in addition to the complex appearance of the lesion. To deal with this problem, we propose a novel framework based on synthesized pseudo Diffusion-Weighted Imaging (DWI) from perfusion parameter maps to obtain better image quality for more accurate segmentation. Our framework consists of three components based on Convolutional Neural Networks (CNNs) and is trained end-to-end. First, a feature extractor is used to obtain both a low-level and high-level compact representation of the raw spatiotemporal Computed Tomography Angiography (CTA) images. Second, a pseudo DWI generator takes as input the concatenation of CTP perfusion parameter maps and our extracted features to obtain the synthesized pseudo DWI. To achieve better synthesis quality, we ...
Aims To estimate the life attributable risk (LAR) of cancer incidence over a wide range of dose radiation exposure and a large spectrum of possible diagnostic computed tomographic coronary angiography (CTCA) scenarios.. Methods This study included 561 consecutive patients who underwent a successful prospective ECG-gating CTCA protocol (low-dose group) 64-slice CTCA and 188 patients who underwent retrospective ECG-gating CTCA with ECG-triggered dose modulation CTCA (high-dose group). LAR was computed, given the organ equivalent dose, for all cancers in both sexes. LAR was tabulated for each decile of dose-length product by 10-year age classes, separately for each sex.. Results Estimates of LAR of any cancer for an exposure at age ≤40 year were lower in males than in females for any given quantile. At age ≥50years, LAR was similar between sexes only at the lowest exposure doses, whereas at higher dosage, it was, in general, higher for women. At the median age of this case series (62 years) and ...
This was a retrospective cohort study of 59 patients with a diagnosis of renal stones that had both a non-contrast and contrast-enhanced CT scan in the portal venous phase between 2009 to 2014 in a single center in the United States. Exclusion criteria included patients with medullary nephrocalcinosis, polycystic kidney disease, or with significant CT motion artifact. CT scans were reconstructed at a thickness of 1.25mm with maximum projection intensity images. Image analysis on the contrast-enhanced CT scans was performed by two independent subspecialty radiologists blinded to the clinical information and radiology reports. The reference standard was the number and size of stones seen on the non-contrast enhanced CT scan. At the conclusion of the trial, the sensitivity of thin axial images was 89.9% (95%CI 83.5 to 94.0%), 99.0% (95%CI 94.0 to 99.9%), and 100.0% (95%CI 92.2 to 100.0%) for reviewer 1 and 83.1% (95%CI 75.9 to 88.6%), 98.0% (95%CI 92.6 to 99.7%) and 100.0% (95%CI 92.2 to 100.0%) ...
p,X-ray computed tomography (CT) has been used for diagnosis of pulmonary emphysema because it can reveal the morphology of low attenuation areas. Recently, 99mTc-Technegas imaging, one of several types of scintigraphic techniques, has been used for ventilation scintigraphy. Technegas scintigraphy was performed on 15 patients with pulmonary emphysema, and we compared the extent and degree of abnormal findings on Technegas scintigraphy with the extent of low attenuation areas shown by CT. We classified the findings of Technegas imaging into three grades, from mild to severe, according to the extent of peripheral irregularity and central hot spot formation. We also classified the findings of CT as centrilobular emphysema into three grades from mild to severe according to the extent of low attention areas in the peripheral lung fields. In 5 cases, CT and Technegas assessment resulted in equivalent diagnoses. In eight cases, Technegas images showed more detailed findings than CT images. In the two ...
Reston, Va. (April 15, 2014) - Image Wisely recently launched its third Image Wisely Radiation Safety Case - CT Brain Perfusion Dose Optimization. This is the latest in a series of free, online and mobile-compatible educational offerings, developed with the assistance of the American College of Radiology, that allow radiologists, imaging technologists and medical physicists to assess their understanding of important radiation safety concepts - including dose monitoring and optimization.. Several years ago, the U.S. Food and Drug Administration investigated a series of unexpected high exposures associated with CT brain perfusion procedures that resulted in skin injuries and hair loss, said Lifeng Yu, PhD, primary author of the new radiation safety case. In an appropriate clinical setting where CT perfusion exams are justified and scanning techniques are correctly used, it is unlikely that the radiation dose would reach the threshold level for skin burns to occur. This case presents strategies ...
RADIOLOGY: HEPATOBILIARY: Case# 32822: RCC METASTASIS, HEMANGIOMA. This is a 62 year old male who is three years status post right radical nephrectomy for a renal cell carcinoma. The patient had a previous abdominal CT done two months ago that showed a suspicious liver mass. Pre-contrast images through the liver demonstrate a 2 x 1.5cm low attenuation mass inferiorly and posteriorly which was identified on the previous CT and a 4 x 4cm low attenuation mass within the posterior segment of the right lobe not previously identified. The 4cm mass shows intense but fairly homogenous peripheral enhancement with central low attenuation. Delayed images through the liver show central filling of the large mass. The smaller mass is not visible on post contrast images. The appearance of the small lesion is grossly unchanged from the prior study when it was thought to be a hemangioma. The liver is a common site for the metastatic spread of malignant tumors. Metatstatic lesions are the most common malignant ...
Definition : Computed tomography (CT) scanning systems in which the table moves the patient into the gantry and the x-ray tube rotates around the patient in such a way that each revolution produces one slice. Axial CT scanners are classified according to the geometry of the x-ray tube detector system in generations (e.g., first, second). Typical scanning time for each slice is on the order of a few seconds. These systems are mostly used for diagnostic and examination purposes, including the diagnosis of injuries, lesions, and malignancies.. Entry Terms : Axial CT Scanners , Computed Axial Tomography Scanners , Scanners, Computed Axial Tomography , CAT Scanners. UMDC code : 18446 ...
TY - JOUR. T1 - Computed Tomographic Angiography of Endovascular Abdominal Aortic Stent-Grafts. AU - Yee, Judy. AU - Galdino, Greg. AU - Urban, Joseph. AU - Sawhney, Rajiv. PY - 2004/4/16. Y1 - 2004/4/16. N2 - The treatment of aortic abdominal aneurysms with endovascular repair provides a treatment alternative for high-risk surgical candidates. Computed Tomographic Angiography (CTA) has become the preferred imaging modality for preoperative evaluation of abdominal aortic aneurysms, postoperative assessment of endovascular repair and complications, and long term surveillance. Accurate evaluation of these devices and identification of endoleaks and other complications by the radiologist is critical to assuring successful outcomes.. AB - The treatment of aortic abdominal aneurysms with endovascular repair provides a treatment alternative for high-risk surgical candidates. Computed Tomographic Angiography (CTA) has become the preferred imaging modality for preoperative evaluation of abdominal aortic ...
TY - JOUR. T1 - Gastric cancer staging at isotropic MDCT including coronal and sagittal MPR images. T2 - Endoscopically diagnosed early vs. advanced gastric cancer. AU - Kim, Yoo Na. AU - Choi, Dongil. AU - Kim, Seong Hyun. AU - Kim, Min Ju. AU - Lee, Soon Jin. AU - Lee, Won Jae. AU - Kim, Sung. AU - Kim, Jae J.. PY - 2009/1. Y1 - 2009/1. N2 - Background: The aims of this study are to evaluate and compare the accuracies of isotropic multi-detector row CT (MDCT) including multiplanar reconstruction (MPR) images for preoperative staging of endoscopically diagnosed early gastric cancer (eEGC) and advanced gastric cancer (eAGC). Methods: One hundred and five patients with endoscopically proven gastric cancer underwent isotropic MDCT. Three independent radiologists evaluated T and N staging both on transverse images only and on three orthogonal MPR images. The staging of each tumor was surgico-pathologically confirmed. The receiver operating characteristic (ROC) analysis and the Wilcoxon signed ...
Lobe-based computed tomography assessment of airway diameter, airway or vessel number, and emphysema extent in relation to the clinical outcomes of COPD Kazuyoshi Kurashima,1 Yotaro Takaku,1 Toshiko Hoshi,2 Tetsu Kanauchi,2 Keitaro Nakamoto,1 Noboru Takayanagi,1 Tsutomu Yanagisawa,1 Yutaka Sugita,1 Yoshinori Kawabata3 1Respiratory Medicine, 2Radiology, 3Pathology, Saitama Cardiovascular and Respiratory Center, Saitama, Japan Objective: The aim of this study was to evaluate the relationship between computed tomography assessed lobe-based lung parameters and the clinical outcomes of patients with chronic obstructive pulmonary disease (COPD), including the frequency of exacerbation and annual change in forced expiratory volume in 1 second (FEV1). Patients and methods: We studied 65 patients with COPD. We reconstructed computed tomography images to trace the bronchial tree from right B1 to B10 and created 3 cm circle images around the airways exactly perpendicular to the airway axis in the central, middle
A study of more than 12,000 children from emergency departments throughout the country in the Pediatric Emergency Care Applied Research Network (PECARN) has identified seven factors that can help physicians determine the need for a computed tomography (CT) scan following blunt trauma to the abdomen. Because CT scans pose radiation hazards for youngsters, the findings may enable doctors to determine which children do not need to be exposed to such tests after a traumatic injury.
Once inside the scanner, the machines x-ray beam rotates around you. Small detectors inside the scanner measure the amount of x-rays that make it through the abdomen. A computer takes this information and creates several individual images, called slices ...
Although a CT brain scan within 12 h of the onset of headache confirms the diagnosis in about 98% of subarachnoid haemorrhage (SAH) patients (Van der Wee et al. 1995), blood is visible in only about 50% a week later (Van Gijn & Van Dougen 1982). Clearly therefore some patients with a sudden onset headache and a normal CT brain scan may still have had an SAH, particularly if the scan is delayed. Detecting the final few cases is important because a missed aneurysmal SAH can be fatal if a recurrent bleed occurs, and clipping or coiling will prevent this.. The standard follow-on test after a negative CT is evidence of blood in the cerebrospinal fluid (CSF). Any test must be sensitive enough to pick up cases of aneurysmal SAH and so allow timely intervention, but specific enough not to expose too many patients to the risk of unnecessary tests,. ...
Routine PET/CT scans are taken while patients are breathing normally. The motions made by breathing can reduce the image quality of the scan. Minimizing the effects of this motion by taking the images and processing the scans differently may improve the image quality.. The PET/CT Scan:. If you agree to take part in this study, an elastic belt will be placed around your lower chest/upper abdomen before your routine PET/CT scan. This belt is used to track your breathing motion. This information will be used to help process the scan.. Your PET/CT scan will be performed as usual. During the scan, researchers will focus on your lower chest/upper abdomen (areas that experience breathing motion). Having to focus on this area might extend the scan by up to 10 minutes.. The additional scan time will not increase your radiation exposure since only PET scanning will be performed.. Length of Study:. Your participation on this study will be complete when your scheduled PET/CT scan is complete.. This is an ...
Introduced in 1970s, Computed tomography (CT) was developed initially as a brain scanner, which is later been used for multiple application. The CT is based on a basic concept: A thin cross-section of the head, a tomographic slice, was examined from multiple angles with a pencil-like x-ray beam. The CT has not only been used for human but also for animals. In many cases, CT imaging can provide valuable information that cannot be obtained with ultrasound and radiography. CT uses x-rays and computer processing to create cross sectional (transverse) slices of internal structures. CT images are not only clear but can isolate a specific internal region. Each CT slice is formatted from multiple x-ray exposures captured as the scan completes a 360 degree rotation. It is important for doctors to know the indications for CT imaging so this modality can be incorporated into a case when financially feasible.. Veterinary Computed Tomography Scanner Market: Drivers and Restraints. The veterinary computed ...
This observer performance study assessed lesion detection in the computed tomography attenuation correction image, as would be produced for myocardial perfusion imaging over a tube current (mA) range. A static anthropomorphic chest phantom containing simulated pulmonary lesions was scanned using the four available mA values (1, 1.5, 2 and 2.5) on a GE Infinia Hawkeye 4. All other computed tomography acquisition parameters remained constant throughout. Twenty-seven cases showing zero to four lesions were produced for a free-response receiver-operating characteristic method. Image observations were completed using our novel web-based ROCView software under controlled conditions. The Jackknife alternative free-response receiver-operating characteristic (JAFROC) figure of merit was used for significance testing, wherein a difference in lesion detection performance was considered significant at P values less than 0.05. Twenty readers with varying computed tomography experience (0-24 years) evaluated ...
TY - JOUR. T1 - Cervical diplomyelia revealed by computed tomography (CT). AU - Giordano, G. B.. AU - Davidovits, P.. AU - Cerisoli, M.. AU - Giulioni, M.. PY - 1982. Y1 - 1982. N2 - An unusual case of cervical diplomyelia diagnosed by computed tomography (ct) is reported. the usefulness of ct examination in the evaluation of spinal dysraphic defects is emphasized, though performed without csf enhancement. visualization of spinal cord splitting in the absence of bony spicula allows the authors to differentiate between diplomyelia and diastematomyelia which have been often described by using both terms interchangeably.. AB - An unusual case of cervical diplomyelia diagnosed by computed tomography (ct) is reported. the usefulness of ct examination in the evaluation of spinal dysraphic defects is emphasized, though performed without csf enhancement. visualization of spinal cord splitting in the absence of bony spicula allows the authors to differentiate between diplomyelia and diastematomyelia ...
TY - JOUR. T1 - Could texture features from preoperative ct image be used for predicting occult peritoneal carcinomatosis in patients with advanced gastric cancer?. AU - Kim, Hae Young. AU - Kim, Young Hoon. AU - Yun, Gabin. AU - Chang, Won. AU - Lee, Yoon Jin. AU - Kim, Bohyoung. PY - 2018/3. Y1 - 2018/3. N2 - Purpose To retrospectively investigate whether texture features obtained from preoperative CT images of advanced gastric cancer (AGC) patients could be used for the prediction of occult peritoneal carcinomatosis (PC) detected during operation. Materials and methods 51 AGC patients with occult PC detected during operation from January 2009 to December 2012 were included as occult PC group. For the control group, other 51 AGC patients without evidence of distant metastasis including PC, and whose clinical T and N stage could be matched to those of the patients of the occult PC group, were selected from the period of January 2011 to July 2012. Each group was divided into test (n = 41) and ...
We will obtain data using multi-slice CT technology to detect subclinical coronary disease in the HIV population. Determination of subclinical cardiovascular disease using noninvasive technology and elucidation of the associated risk factors will help to guide targeted therapy to prevent cardiovascular events in this patient population.. We will investigate the prevalence of coronary plaque lesions and coronary artery calcifications in men and women with HIV disease as determined by 64-row multidetector computed tomography (MDCT) and MDCT coronary angiography in comparison to age-matched control subjects without HIV infection. We hypothesize that evidence of coronary artery calcification and coronary plaque lesions as seen by MDCT will be present in individuals with HIV more than non-HIV control subjects of the same age. We also hypothesize the degree of atherosclerosis will be increased in HIV patients compared to control subjects.. We will evaluate the metabolic and inflammatory factors ...
Computed tomography[edit]. Computed tomography (CT scan) is often used.[22][23] The accuracy of the CT scan depends on whether ... Plain X-ray[edit]. Plain X-rays are often normal or show non-specific findings.[21] ... "Can acute mesenteric ischemia be ruled out using computed tomography? Critically appraised topic ,". Canadian Association of ... Computer tomography (CT) showing dilated loops of small bowel with thickened walls (black arrow), findings characteristic of ...
Computed tomography scan of nasopharynx. *X-ray lateral view of nasopharynx. Detailed nasal examination should always be done ...
X-ray computed tomography (X-ray CT), computerized axial tomography scan (CAT scan),[2] computer aided tomography, computed ... For non-medical computed tomography, see industrial computed tomography scanning. For non-X-ray tomography, see Tomography. ... Main article: History of computed tomography. The history of X-ray computed tomography goes back to at least 1917 with the ... Main article: Operation of computed tomography. Computed tomography operates by using an X-ray generator that rotates around ...
CR = Computed Radiography. *CS = Cystoscopy. *CT = Computed Tomography. *DD = Duplex Doppler. *DF = Digital Fluoroscopy ( ... X-Ray Angiographic Bi-Plane Image Storage 1.2.840.10008. ...
Quantitative computed tomography (QCT) In the past 20 years, Computer Layer (CT) has been widely used in the field of clinical ... Similar to DPA, the basic principle of DXA is to measure the high and low energy X-ray transmission of stable X-ray sources. ... A comparison of plain radiographs with single- and dual-photon absorptiometry and with quantitative computed tomography". ... Adams, Judith E. (2009). "Quantitative computed tomography". European Journal of Radiology. 71 (3): 415-424. doi:10.1016/j. ...
"X-ray computed tomography of two mammoth calf mummies". Journal of Paleontology. 88 (4): 664-675. doi:10.1666/13-092.. ... including computer tomography scans. Additional scans were conducted at the GE Healthcare Institute in Waukesha, Wisconsin and ...
Dose in x-ray computed tomography. Phys Med Biol 2014; 59 R129-R150 [10] Kalender WA, Beister M, Boone JM, Kolditz D, Vollmar ... An integral approach to vertebral bone mineral analysis by X-ray computed tomography. Radiology 1987; 164:419-423 [2] Kalender ... Eur Radiol 2017; 27:1081-1087 [12] The 4th edition of the textbook "Computed Tomography" by WA Kalender, published by Publicis ... Kalender developed volumetric spiral computed tomography; the world's first clinical spiral CT studies were presented at RSNA ...
doi:10.1002/047084289X.rl121.pub2 Lusic, Hrvoje; Grinstaff, Mark W. (2013). "X-ray-Computed Tomography Contrast Agents". ...
In computed tomography (CT scanning) an X-ray source and its associated detectors rotate around the subject which itself moves ... Computed tomography or CT scan (previously known as CAT scan, the "A" standing for "axial") uses ionizing radiation (x-ray ... MedPix Medical Image Database Video on X-ray inspection and industrial computed tomography, Karlsruhe University of Applied ... projectional radiography and computed tomography images generally use X-rays created by X-ray generators, which generate X-rays ...
A variety of imaging techniques such as X-ray radiography, ultrasound, computed tomography (CT), nuclear medicine including ... CT imaging uses X-rays in conjunction with computing algorithms to image the body.[5] In CT, an X-ray tube opposite an X-ray ... computed tomography (CT), nuclear medicine including positron emission tomography (PET), and magnetic resonance imaging (MRI). ... single-photon emission computed tomography - SPECT or Positron-emission tomography - PET). In the most modern devices, nuclear ...
"X-ray-Computed Tomography Contrast Agents". Chemical Reviews. 113 (3): 1641. doi:10.1021/cr200358s. PMC 3878741 . PMID 23210836 ...
The Golden S sign can be seen on plain radiographs as well as on computed tomography (CT) scans of the chest. The sign is seen ... He was (twice) president of the Roentgen Ray Society as well as a trustee of the New York Academy of Medicine, and chairman of ... 13 (21). Reinig JW, Ross P (July 1984). "Computed tomography appearance of Golden's "S" sign". J Comput Tomogr. 8 (3): 219-23. ... Golden R (1925). "The effect of bronchostenosis upon the roentgen ray shadow in carcinoma of the bronchus". Am J Roentgenol. ...
Whiting, Bruce R. (3 May 2002). "Signal statistics in x-ray computed tomography". Medical Imaging 2002: Physics of Medical ... There has been applications to insurance claims and x-ray computed tomography. Compound Poisson process Hermite distribution ... "Efficient and accurate likelihood for iterative image reconstruction in x-ray computed tomography". Medical Imaging 2003: Image ... "Properties of preprocessed sinogram data in x-ray computed tomography". Medical Physics. 33 (9): 3290-3303. Bibcode:2006MedPh.. ...
Computed tomography may also be used. Scapular fractures can be detected in the standard chest and shoulder radiographs that ... Lateral view of the left scapula Most fractures of the scapula can be seen on a chest X-ray; however, they may be missed during ... Imaging techniques such as X-ray are used to diagnose scapular fracture, but the injury may not be noticed in part because it ...
Cysts are detected with ultrasound, X-ray computed tomography, or other imaging techniques. Antiechinococcus antibodies can be ...
"Ptychographic X-ray computed tomography at the nanoscale". Nature. 467 (7314): 436-439. Bibcode:2010Natur.467..436D. doi: ... Further Pfeiffer is known for his research in X-ray Ptychography, X-ray tensor tomography, grating-based Neutron ... In 2006 he demonstrated the feasibility of phase sensitive X-ray imaging with conventional, polychromatic X-ray sources and a ... "Six-dimensional real and reciprocal space small-angle X-ray scattering tomography". Nature. 527 (7578): 353-356. Bibcode: ...
September 2010). "Ptychographic X-ray computed tomography at the nanoscale". Nature. 467 (7314): 436-9. Bibcode:2010Natur.467.. ... Progress at X-ray wavelengths was then quick. By 2010, the SLS had developed X-ray ptycho-tomography, now a major application ... In terms of routine analysis, X-ray ptycho-tomography is today the most commonly used technique. It has been applied to many ... In the latter case, the (linear) phase signal is also ideal for high-resolution X-ray ptychographic tomography. The strength ...
Bouyssie, JF; Bouyssie S; Sharrock P; Duran D (1997). "Stereolithographic models derived from x-ray computed tomography. ... 19 (3): 193-9. Winder, RJ; Bibb, R (2009). "A Review of the Issues Surrounding Three-Dimensional Computed Tomography for ...
"X-ray computed tomography of two mammoth calf mummies". Journal of Paleontology. 88 (4): 664-675. doi:10.1666/13-092. van Geel ... The mammoth was transferred to Jikei University School of Medicine in Japan for further study, including computer tomography ...
Fisher, Daniel C. (2014). "X-ray computed tomography of two mammoth calf mummies". Journal of Paleontology. 88 (4): 664-675. ... Newcomb, Raymond Lee (1888). Our lost explorers : the narrative of the Jeannette Arctic Expedition as related by the survivors ...
Roessl, E.; Proksa, R. (2007). "K-edge imaging in X-ray computed tomography using multi-bin photon counting detectors". Phys. ... Dual energy computed tomography versus standard computed tomography". Investig. Radiol. 44: 293-297. doi:10.1097/RLI. ... to measure the concentration of iodine in X-ray images. In the 70's, spectral computed tomography (CT) with exposures at two ... Alvarez, R.E.; Macovski, A. (1976). "Energy-selective reconstructions in X-ray computerized tomography". Phys. Med. Biol. 21 (5 ...
The perforation can often be visualised using computed tomography. White blood cells are often elevated. Surgical intervention ... Gas is easily visualized on x-ray while the patient is in an upright position. ... free air from a perforation can often be seen on plain X-ray. Perforation anywhere along the gastrointestinal tract typically ...
5,000 patient dose measurements from 375 hospitals) Brenner, David J.; Hall, Eric J. (2007). "Computed Tomography - an ... Hart, D.; Wall, B. F. (2002). Radiation Exposure of the UK Population from Medical and Dental X-ray Examinations (PDF). ... Wall, B. F.; Hart, D. (1997). "Revised Radiation Doses for Typical X-Ray Examinations". The British Journal of Radiology. 70 ( ...
... , the distance between passes in the helical scanning pattern of X-ray computed tomography ...
Well-preserved specimens yield details as small as 5 μm through X-ray computed tomography.[15] ...
... is X-ray computed tomography (CT) using radiocontrast. Radiocontrasts for X-ray CT are, in general, iodine-based ... The injection of iodinated contrast agents may sometimes lead to its extravasation Computed tomography of the abdomen and ...
With X-ray micro-computed tomography (micro-CT), no ink can be seen as carbon-based ink is not visible on carbonized papyrus. ... "Analysis Of Herculaneum Papyri With X-ray Computed Tomography" (PDF). S2CID 7667891. Archived from the original (PDF) on 2019- ... ANALYSIS OF HERCULANEUM PAPYRI WITH X-RAY COMPUTED TOMOGRAPHY Center for Visualization & Virtual Environments; U. Kentucky Brun ... 2016). "Enhanced X-ray-phase-contrast-tomography brings new clarity to the 2000-year-old 'voice' of Epicurean philosopher ...
X-ray Computed Micro-Tomography of the Divje Babe 'Flute'*". Archaeometry. 54 (3): 581-590. doi:10.1111/j.1475-4754.2011.00630. ...
Lewin, P.K. "Whole body scan of an Egyptian mummy using X-ray computed axial tomography." Paleopathology Newsletter #22:T 7-8 ( ... Peter Lewin at the Hospital for Sick Children in Toronto, he carried out the world's first computed tomographic (CT) scan of a ...
Computed Tomography Scan (CT scans): x-ray image slices combined to create surface for 3D landmarks ... which is a computed deformation grid that calculates a mapping function between two individuals that measures point differences ... 4] Basically, the TPS interpolation has a template computed grid that is applied to specimens and the differences in shape can ... Principal component scores are computed through an eigendecomposition of a sample's covariance matrix and rotates the data to ...
Alternative methods of scanning include x-ray computed tomography (CT), magnetic resonance imaging (MRI) and functional ... Analytical techniques, much like the reconstruction of computed tomography (CT) and single-photon emission computed tomography ... In modern PET computed tomography scanners, three-dimensional imaging is often accomplished with the aid of a computed ... 2010). "Clinical value of 18F-fluorodihydroxyphenylalanine positron emission tomography/computed tomography (18F-DOPA PET/CT) ...
3D rendering of a computed tomography scan of a leaf. Leaves are the most important organs of most vascular plants.[8] Green ... Esau, Katherine (2006) [1953]. Evert, Ray F (ed.). Esau's Plant Anatomy: Meristems, Cells, and Tissues of the Plant Body: Their ...
... x-ray computed tomography, ultrasonography, and nuclear magnetic resonance tomography. Interventional radiologists can access ...
Magnetic resonance imaging (MRI) and single-photon emission computed tomography (SPECT) are two of the tests that can identify ... Ryan KJ, Ray CG, eds. (2004). Sherris Medical Microbiology (4th ed.). McGraw Hill. pp. 434-37. ISBN 978-0-8385-8529-0. .. ... Ray JA, Bjork J, Steward CR, Deedon A, Lee X, Kingry LC, Miller TK, Feist MA, Theel ES, Patel R, Irish CL, Petersen JM (May ...
In computed tomography (CT scanning) an X-ray source and its associated detectors rotate around the subject which itself moves ... Computed tomography or CT scan (previously known as CAT scan, the "A" standing for "axial") uses ionizing radiation (x-ray ... In medicine and dentistry, projectional radiography and computed tomography images generally use X-rays created by X-ray ... Video on X-ray inspection and industrial computed tomography, Karlsruhe University of Applied Sciences ...
... (CTLM) is the trademark of Imaging Diagnostic Systems, Inc. (IDSI, United States) for its ... The technology uses laser in the same way computed tomography uses X-Rays, these beams travel through tissue and suffer ... Optical computed tomography for imaging the breast: first look // Proc. SPIE, 2000, Vol. 4082, p. 40-45. ... Retrieved from "" ...
Its most frequently used to work with magnetic resonance imaging (MRI) and computed tomography (CT) data sets. ... In modern scanners, three dimensional imaging is often accomplished with the aid of a CT X-ray scan performed on the patient ... Positron emission tomography (PET) a nuclear medical imaging technique that produces a three-dimensional image or picture of ... When labeled with the isotope fluorine-18 it is used as a radioligand in positron emission tomography (PET) studies of the ...
With Godfrey Hounsfield's invention of computed tomography (CT) in 1971, three-dimensional planning became a possibility and ... Contact x-ray brachytherapy[edit]. Contact x-ray brachytherapy (also called "CXB", "electronic brachytherapy" or the "Papillon ... "Pioneer in X-Ray Therapy". Science. New Series. 125 (3236): 18-19. 4 January 1957. Bibcode:1957Sci...125T..18.. doi:10.1126/ ... Megavoltage x-ray units were first built in the late 1930s but because of cost were limited to a few institutions. One of the ...
"Diagnostic accuracy of laparoscopy following computed tomography (CT) scanning for assessing the resectability with curative ... Bardou M, Le Ray I (december 2013). "Treatment of pancreatic cancer: A narrative review of cost-effectiveness studies". Best ... Castellano D, Grande E, Valle J, Capdevila J, Reidy-Lagunes D, O'Connor JM, Raymond E (2014). "Expert consensus for the ...
MRI or X-ray computed tomography abnormalities. *Oculomotor apraxia. *Microcephaly. *Macrocephaly. *Hyperreflexia ... Cranial computed topography, magnetic resonance imaging, and flurodeoxyglucose positron emission topography are just some of ...
When a high-energy (TeV) gamma photon or cosmic ray interacts with the Earth's atmosphere, it may produce an electron-positron ... If the momentum of the particle is measured independently, one could compute the mass of the particle by its momentum and ... "Cerenkov Luminescence Tomography for In Vivo Radiopharmaceutical Imaging". International Journal of Biomedical Imaging. 2011 ... Hence, observed angles of incidence can be used to compute the direction and speed of a Cherenkov radiation-producing charge. ...
A computed tomography scanner combines an X-ray machine and computer to construct a three dimensional (3D) picture. This has ... Sometimes the term "X-Ray" means these pictures instead of the radiation that makes them. ... than the X-ray is called Gamma radiation (γ-rays). These are all parts of the electromagnetic spectrum. ... Retrieved from "" ...
3D / ECT(英语:emission computed tomography). *SPECT(英语:Single-photon emission computed tomography) *gamma ray: Myocardial ... Quantitative computed tomography(英语:Quantitative computed tomography). *Spiral computed tomography(英语:Spiral computed ... Computed tomography of the heart. *Computed tomography of the abdomen and pelvis(英语:Computed tomography of the abdomen and ... Computed tomography of the head(英语:Computed tomography of the head) ...
Early names for health informatics included medical computing, biomedical computing, medical computer science, computer ... GPs have access to digital x-ray images from secondary care systems. ... "The story behind the development of the first whole-body computerized tomography scanner as told by Robert S. Ledley". Journal ... "Clinical Research Computing: A Practitioner's Handbook. Academic Press. pp. 173-85. doi:10.1016/B978-0-12-803130-8.00009-9. ...
"No effects of short-term GSM mobile phone radiation on cerebral blood flow measured using positron emission tomography". ...
X-ray microtomography. *Electron beam computed tomography. *Cone beam computed tomography. Targets. *Coronary *Calcium scan ...
The reflectivity has advantages over silicon in neutron and high energy X-ray applications.[75] Crystals of high purity ... Germanium is emerging as an important material for spintronics and spin-based quantum computing applications. In 2010, ... "A Bismuth Germanate-Avalanche Photodiode Module Designed for Use in High Resolution Positron Emission Tomography". IEEE ... Diehl, R.; Prantzos, N.; Vonballmoos, P. (2006). "Astrophysical constraints from gamma-ray spectroscopy". Nuclear Physics A. ...
X-ray microtomography. *Electron beam computed tomography. *Cone beam computed tomography. Targets. *Coronary *Calcium scan ...
"Confocal X-ray Fluorescence Imaging and XRF Tomography for Three Dimensional Trace Element Microanalysis". Microscopy and ... Computed tomography of the head. *Quantitative computed tomography. *Spiral computed tomography. *High resolution CT ... Confocal X-ray fluorescence imaging is a newer technique that allows control over depth, in addition to horizontal and vertical ... The signal was visualized by a CRT of an oscilloscope, the cathode ray was moved simultaneously with the objective. A special ...
Computed Body Tomography with MRI Correlation. Philadelphia: Lippincott Williams & Wilkins. pp. 311-324. ISBN 0-7817-4526-8. ... Thymus of a fetus On chest X-ray, the thymus appears as a radiodense (brighter in this image) mass by the upper lobe of the ...
... for his work on X-ray computed tomography (CT). ... Computed tomography. Awards. Nobel Prize in Physiology or ... Although he was mainly working on particle physics, Cormack's side interest in x-ray technology led him to develop the ...
Single-photon emission computed tomography (SPECT) is similar to PET and uses gamma ray-emitting radioisotopes and a gamma ... Computed axial tomographyEdit. Main article: CT head. Computed tomography (CT) or Computed Axial Tomography (CAT) scanning uses ... Positron emission tomographyEdit. Positron emission tomography (PET) and brain positron emission tomography, measure emissions ... the development of radioligands allowed single photon emission computed tomography (SPECT) and positron emission tomography ( ...
Horn Investigated by X-ray Computed Tomography and Histology With Implications for Growth and External Form" (PDF). Journal of ... Ahmad Zafir, Abdul Wahab; Payne, Junaidi; Mohamed, Azlan; Lau, Ching Fong; Sharma, Dionysius Shankar Kumar; Alfred, Raymond; ... and remains visible on x-ray scanners even when the horn is ground to a fine powder.[82][84] ...
Computed Tomography, better known as C.T. Scans or CAT Scans have made an enormous contribution to medicine, however not ... In x-ray facilities, walls surrounding the room with the x-ray generator may contain lead sheets, or the plaster may contain ... It also absorbs gamma rays, which produces X-ray fluorescence. Each subsequent layer absorbs the X-ray fluorescence of the ... X-ray and gamma radiation are best absorbed by atoms with heavy nuclei; the heavier the nucleus, the better the absorption. In ...
X-ray computed tomography (X-ray CT), and positron emission tomography (PET). ... Redirected from Single photon emission computed tomography). Single-photon emission computed tomography (SPECT, or less ... Wikimedia Commons has media related to Single photon emission computed tomography.. *Human Health Campus, The official website ... Single-photon emission computed tomography. A SPECT slice of the distribution of technetium exametazime within a patient's ...
See Flashes in the Sky: Earth's Gamma-Ray Bursts Triggered by Lightning Archived 7 July 2014 at the Wayback Machine ... "cathode ray" matter was subsequently identified by British physicist Sir J.J. Thomson in 1897.[15] ... Positron-emission tomography (PET). Therapy. *Fast-neutron. *Neutron capture therapy of cancer ...
Computed tomography angiography, magnetic resonance angiography, invasive angiography. Treatment. Anticoagulation, angioplasty ... At that point, radiocontrast is injected and its downstream flow captured on fluoroscopy (continuous X-ray imaging).[16] The ... More modern methods involve computed tomography (CT angiography) and magnetic resonance imaging (MR angiography). They use ...
Radiology is concerned with imaging of the human body, e.g. by x-ray, x-ray computed tomography, ultrasonography, and nuclear ... magnetic resonance tomography. *Interventional radiology is concerned with using imaging of the human body, usually from CT, ...
... is a nondestructive technique for visualizing interior features within solid objects, and for ... X-ray Computed Tomography (CT) Instrumentation - How Does It Work?. The elements of X-ray tomography are an X-ray source, a ... What is X-ray Computed Tomography (CT). X-ray Computed Tomography (CT) is a nondestructive technique for visualizing interior ... For more information about X-ray Computed Tomography (CT) follow the links below.. The University of Texas CT Lab web site ...
... a global leader in X-ray analytical instrumentation, is pleased to announce the next ... X-ray Computed Tomography for Geology ApplicationsPress Release: Rigaku Presents New Webinar: X-ray Computed Tomography for ... X-ray computed tomography (CT) is a technique used to image objects-including rocks, meteorites or fossils-non-destructively in ... X-ray computed tomography (CT) is a technique used to image objects-including rocks, meteorites or fossils-non-destructively in ...
Dynamic computed tomography (CT) imaging aims at reconstructing image sequences where the dynamic nature of the living human ...
The division x-ray imaging and computed tomography of the DKFZ aims at improving x-ray and CT imaging in all aspects, with a ... X-ray computed tomography (CT), based on the measurement of x-ray attenuation from a multitude of view angles around the ... Division of X-Ray Imaging and Computed Tomography. Prof. Dr. Marc Kachelrie © ... Besides clinical computed tomography, several other medical CT modalities are in use, today. Interventional studies, for ...
We employ state-of-the-art, 3D, non-destructive microCT (X-ray) technologies and innovative image analysis techniques to ... Technical advance: Extracting multiple interacting root systems using X-ray CT. Description. Using X-ray CT, 3D geometries of ... Find out about our X-ray CT services for academic and business projects ... X-ray) technologies and innovative image analysis techniques to explore and quantify the internal architecture of biomaterials ...
Assessment of Localized Deformations in Sand Using X-Ray Computed Tomography. (Received 12 November 1998; accepted 19 January ... Title Assessment of Localized Deformations in Sand Using X-Ray Computed Tomography. Symposium , Committee D18 ... The internal fabric and localized deformation patterns of triaxial sand specimens were investigated using computed tomography ( ...
This study presents a systematic method to examine the characteristics of the REV using X-ray computed tomography images. The 3 ... Representative Elementary Volume Analysis of Sands Using X-Ray Computed Tomography. (Received 14 December 2005; accepted 20 ... Title Representative Elementary Volume Analysis of Sands Using X-Ray Computed Tomography. Symposium , Committee D18 ...
X-ray tomography. X ray tomography or CT scanning is an increasingly used technique for non-destructive three dimensional ... Lately science and industry also show a growing interest in X ray tomography. After all, tomography is more than only imaging. ... The result of a tomography is a virtual 3D presentation of the scanned object, both in- and outside. You can produce any slice ... Thanks to the rapid development of both the X-ray tubes as the detectors, we can image objects with continuously better ...
This paper describes a statistical image reconstruction method for X-ray computed tomography (CT) that is based on a physical ...
Present commercial x-ray computed tomography (CT) scanners are capable of producing single cross section images of the head, ... Present commercial x-ray computed tomography (CT) scanners are capable of producing single cross section images of the head, ... Robb, R. A., Ritman, E. L., Harris, L. D., and Wood, E. H., "Dynamic Three-Dimensional X-Ray Computed Tomography of the Heart, ... Gilbert B.K., Robb R.A., Krueger L.M. (1980) Ultra High-Speed Reconstruction Processors for X-Ray Computed Tomography of the ...
Micro Computed Tomography System (µCT) - Zeiss Versa 610 X-Ray Microscope. The high resolution Zeiss Versa 610 µCT system is ...
Gamma-Ray Computed Tomography in Soil Science: Some Applications, Computed Tomography Luca Saba, IntechOpen, DOI: 10.5772/23863 ... Gamma-Ray Computed Tomography in Soil Science: Some Applications, Computed Tomography Luca Saba, IntechOpen, DOI: 10.5772/23863 ... ... ...
... as a computed tomography (CT) contrast agent with tumor targeting capability through in vitro... ... AuNP-DG: Deoxyglucose-Labeled Gold Nanoparticles as X-ray Computed Tomography Contrast Agents for Cancer Imaging. ... To study the feasibility of using 2-deoxy-d-glucose (2-DG)-labeled gold nanoparticle (AuNP-DG) as a computed tomography (CT) ...
... which generates a high voltage to be applied to the X-ray tube, an X-ray detector (23) having a plurality of X-ray detection ... which reconstructs an image on the basis of an output from the X-ray detector, a tube current determining unit (41, 42) which ... element lines, a scanogram generating unit (43) which generates a scanogram on the basis of an output from the X-ray detector, ... An X-ray computed tomography apparatus includes an X-ray tube (10), a high voltage generator (21) ...
36 MATERIALS SCIENCE; microstructure; oxides; porous materials; solid oxide fuel cells; X-ray computed tomography. OSTI ... Synchrotron X-ray nano computed tomography based simulation of stress evolution in LiMn 2O 4 electrodes ... Here in this paper, we use a combination of micro- and nano-scale x-ray computed tomography to study device features and assess ... Here in this study, synchrotron X-ray nano-computed tomography at Advanced Photon Source in Argonne National Laboratory has ...
Using High-Resolution X-Ray Computed Tomography," Copeia, 107(2), 239-243, (1 May 2019) Include:. ... prepared by high-resolution x-ray computed tomography. ... Using High-Resolution X-Ray Computed Tomography. Fidélis Júnio ... Using High-Resolution X-Ray Computed Tomography," Copeia 107(2), 239-243, (1 May 2019). ...
Diagnostic Test: Computed Tomography Scan - 50% Dose Reduction. *Diagnostic Test: Computed Tomography Scan - 70% Dose Reduction ... Prospective Evaluation of MyocaRdial PerFUSion ComputEd Tomography Trial. *Coronary Disease. *Device: computed tomography ... Number of detected venous thromboembolism (VTE) based on Computed Tomography Angiography (CTA) plus Computed Tomography ... Procedure: Positron Emission Tomography and Computed Tomography Scan. Interventional. *Sidney Kimmel Cancer Center at Thomas ...
... a combination of X-ray diffraction (XRD) and computed tomography (CT). Reconstructed 3D images showing the spatial mineral ... X-ray computed tomography (CT) based on attenuation contrast and/or phase contrast is increasingly used in palaeontology, owing ... Examples of these methods are small-angle X-ray scattering computed tomography (SAXS-CT)21,22, coherent diffractive imaging ( ... Harding, G., Kosanetzky, J. & Neitzel, U. X-ray diffraction computed tomography. Medical physics 14, 515-525 (1987). ...
These are designed for X-ray imaging experiments, especially computed tomography, at the medium-length beamline at the SPring-8 ... Comparison of lens- and fiber-coupled CCD detectors for X-ray computed tomography. ... For most of the tests an X-ray energy of 15-25 keV was used. The X-ray flux was measured with an air-filled ionization chamber ... The conversion gain was measured using a 21 keV X-ray beam of size 20 mm × 20 mm. The X-ray flux was divided by integrated ...
... compressed sensing for x-ray computed tomography is a research project within Engineering at the University of Southampton. ... compressed sensing for x-ray computed tomography Currently Active: Yes. X-ray computed tomography (XCT) is a technique that ... For example, in XCT, three-dimensional images are constructed from a set of x-ray projections, taken at several angels around ...
... North Star Imaging, Inc. (NSI). 9, Rogers, MN [USA]. ... 4D X-ray Computed Tomography allows users to reconstruct a complete 3D CT model that includes time and motion, creating a truly ... is currently offering this cutting-edge NDT technology in both their new X-ray Computed Tomography Systems (XView CT) or as an ... North Star Imaging is pleased to announce a new add-on device for NSI X-ray & Computed Tomography (CT) systems ...
Tag: X-ray computed tomography. AAMC recognized for high-quality, rapid care for heart attacks. EOA Staff , February 17, 2015 ...
X-ray micro-computed tomography (XμCT) allows a non-destructive and three-dimensional (3D) study of otherwise complex and ... through X-ray micro-computed tomography.. Koddenberg T1, Krause KC2, Krause A3. ... Image analysis; Silica particles; Syncarpia glomulifera; Three-dimensional imaging; Turpentine wood; X-ray micro-computed ... In this study, XμCT was introduced and tested for examining X-ray dense silica particles in the Australian turpentine wood ( ...
Guarin will summarize the use of x-ray computed tomography at KTH for advanced characterization of the internal microstructure ... Particular attention will be given to emphasize how x-ray computed tomography results can provide enhanced understanding of ... Docent lecture: Advanced materials characterization with x-ray computed tomography for road infrastructure innovation and ...
... Funded by ... X-ray computed tomography (XCT) as widely used in modern Medicine and Diagnosis has only recently been identify as powerful ...
Mineralization of Sialoliths Investigated by Ex Vivo and In Vivo X-ray Computed Tomography ... Mineralization of Sialoliths Investigated by Ex Vivo and In Vivo X-ray Computed Tomography ... Correlative analysis of the same specimens was performed by in vivo and ex vivo helical computed tomography (HCT) and ex vivo ... Sialoliths were characterized in detail by X-ray computed microtomography (μCT) in combination with atomic emission ...
And at Duke University (Durham, NC), the schools X-ray micro computed tomography equipment is arguably among the worlds most ... the XTH 225 ST micro CT X-ray machine from Nikon Metrology (Brighton, MI) along with Nikons 3D reconstruction software was ... When is an X-ray machine not an X-ray machine? Answer: When its a bridge. ... Understanding the Metrology Language for X-ray Computed Tomography. Multi-Sensor Metrology with X-ray Computed Tomography. ...
Iterative image reconstruction (IIR) for x-ray computed tomography (CT) has been heavily investigated in recent years.1 It is ... This requirement can place a prohibitively high computational burden for IIR applied to x-ray computed tomography (CT), ... Analysis of iterative region-of-interest image reconstruction for x-ray computed tomography. ... "Analysis of iterative region-of-interest image reconstruction for x-ray computed tomography," Journal of Medical Imaging 1(3), ...
Home » Multi-Sensor Metrology with X-ray Computed Tomography. NDT Multi-Sensor Metrology with X-ray Computed Tomography. X-ray ... Multi-Sensor Metrology with X-ray Computed Tomography. Quality 101: X-Ray Tomography--the Basics. The Basics of X-Ray ... The principle of X-ray CT. X-ray computed tomography is an appropriate technology for complete acquisition of components ... Understanding the Metrology Language for X-ray Computed Tomography. Related Products. The Little Encyclopedia of GD&T - Author ...
  • With hundreds of major innovations to their credit, Rigaku companies are world leaders in X-ray spectrometry, diffraction, and optics, as well as small molecule and protein crystallography and semiconductor metrology. (
  • Here, we report studies of two fossil bone samples, specifically the tibia of a 300-million-year-old tetrapod, Discosauriscus austriacus , and the humerus of a 370-million-year-old lobe-finned fish, Eusthenopteron foordi , using XRD-CT - a combination of X-ray diffraction (XRD) and computed tomography (CT). (
  • Sialoliths were characterized in detail by X-ray computed microtomography (μCT) in combination with atomic emission spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. (
  • XRD (X-ray diffraction) analysis was also conducted to investigate the frozen state. (
  • Murase N, Uetake Y, Sato Y, Irie K, Ueno Y, Hirauchi T, Kawahara T, Hirai M. Frozen State of Sephadex ® Gels of Different Crosslink Density Analyzed by X-ray Computed Tomography and X-ray Diffraction. (
  • Fiber orientation evolution under both monotonic tensile and stress relaxation tests was tracked using in-situ X-ray diffraction. (
  • Qualitative and quantitative analyses to determine iron sulphides in roofing slates are usually conducted using transmitted and reflected light microscopy, and X-ray diffraction techniques. (
  • The results obtained by tomographic observations were subsequently verified by optical microscopy, X-ray powder diffraction and scanning electron microscopy, as well as energy-dispersive X-ray spectroscopy analyses. (
  • A significant challenge for recent X-ray computed tomographic imaging apparatuses is to realize both an improvement in image quality and a decrease in dosage. (
  • Tomographic analysis of siliceous particulates in Australian turpentine wood (Syncarpia glomulifera) through X-ray micro-computed tomography. (
  • Despite these benefits, comparative examination through scanning electron microscopy and energy-dispersive X-ray spectroscopy is necessary to verify silica particles in tomographic images. (
  • This requirement can place a prohibitively high computational burden for IIR applied to x-ray computed tomography (CT), especially when high-resolution tomographic volumes are required. (
  • Both the capabilities and availability of high resolution X-ray tomographic imaging has increased dramatically over the last decade. (
  • The mathematical theory behind computed tomographic reconstruction dates back to 1917 with the invention of the Radon transform by Austrian mathematician Johann Radon, who showed mathematically that a function could be reconstructed from an infinite set of its projections. (
  • Conventional focal plane tomography remained a pillar of radiologic diagnostics until the late 1970s, when the availability of minicomputers and the development of transverse axial scanning led CT to gradually supplant as the preferred modality of obtaining tomographic images. (
  • The first production X-ray CT machine (in fact called the "EMI-Scanner") was limited to making tomographic sections of the brain, but acquired the image data in about 4 minutes (scanning two adjacent slices), and the computation time (using a Data General Nova minicomputer) was about 7 minutes per picture. (
  • The skull specimen was first examined physically, followed by Micro Focus X-ray Computed Tomography μ CT) to determine the morphology and trajectory of the impacted and ectopically erupting teeth. (
  • The division x-ray imaging and computed tomography of the DKFZ aims at improving x-ray and CT imaging in all aspects, with a special focus on cancer detection and tumor characterization. (
  • X ray tomography or CT scanning is an increasingly used technique for non-destructive three dimensional imaging. (
  • After all, tomography is more than only imaging. (
  • X-ray imaging detectors with an identical phosphor and a CCD chip but employing lens- and fiber-coupling between them have been compared. (
  • These are designed for X-ray imaging experiments, especially computed tomography, at the medium-length beamline at the SPring-8 synchrotron radiation facility. (
  • North Star Imaging, Inc. (NSI) (Rogers, MN) has developed and now offers the latest groundbreaking Industrial X-ray technology 4-Dimensional X-ray Computed Tomography (4D CT). (
  • North Star Imaging, Inc. is currently offering this cutting-edge NDT technology in both their new X-ray Computed Tomography Systems (XView CT) or as an upgrade to almost any existing X-ray system, regardless of the manufacturer. (
  • Objects appearing in the x-ray projections such as the patient couch, which have no relevance to the imaging task, must also be accounted for in the reconstruction volume. (
  • Spectral computed tomography is an emerging imaging method that involves using recently developed energy discriminating photon-counting detectors (PCDs). (
  • Energy sensitive X-ray imaging detectors are produced by connecting a semiconductor sensor to a spectroscopic pixel readout chip. (
  • As an example, X-ray imaging can detect etching or layout errors, shorts caused by faulty interconnects and poor metallization of contact holes. (
  • High-resolution YXLON X-ray imaging is widely used in failure analysis and production quality testing of electronic components, such as solder joint inspection. (
  • Phase contrast X-ray computed tomography (PCI-CT) has recently emerged as a novel imaging technique that allows visualization of cartilage soft tissue, subsequent examination of chondrocyte patterns, and their correlation to osteoarthritis. (
  • Professor Sinclair's talk will consider a number of recent examples of life science utilisation of such techniques, particularly in terms of projects associated with the Southampton µ-VIS X-ray Imaging Centre. (
  • Small-angle x-ray scattering (SAXS) imaging is an emerging medical tool that can be used for in vivo detailed tissue characterization and has the potential to provide added contrast to conventional x-ray projection and CT imaging. (
  • The new advances in the field of 3D imaging including X-ray computed tomography (XCT) and Focused-ion beam/Scanning electron microscopy (FIB-SEM), have enabled the 3D visualization of the electrode's active particles and structures. (
  • X-ray micro computed tomography has been used in the last decades as a non-destructive imaging tool to study in volume the structure of granules and tablets [ 1 ]. (
  • Imaging local cerebral blood flow by Xenon-enhanced computed tomography . (
  • Gamma and X-ray computed tomography (CT) is an imaging technique based on the computation of a large number of transmission measurements of gamma or X-photons. (
  • Non‐invasive imaging of roots with high resolution X‐ray micro‐tomography. (
  • Three dimensional imaging of plant roots in situ with x‐ray computed tomography. (
  • X-ray and neutron computed tomography (CT) have been used successfully for the non-destructive imaging of artifact in art conservation. (
  • The high-performance ROFEX ( RO ssendorf F ast E lectron beam X -ray tomography)imaging technique has been developed at Helmholtz-Zentrum Dresden-Rossendorf for the noninvasive investigation of dynamic processes. (
  • We describe a powerful new imaging modality for terahertz radiation, T-ray reflection computed tomography. (
  • According to one embodiment, an X-ray computed tomography imaging apparatus includes a gantry, and a column. (
  • An x-ray fluorescence computed tomography using a pinhole collimator (p-XFCT) for medical use depicts the 3-D distribution of imaging agent by collecting the x-ray fluorescence photons emitted from the imaging agent accumulated in an organ using a pinhole collimator and a 2-D detector. (
  • In-depth analysis of medical imaging services based on scans such as MRI, X-ray, ultrasound, CT scan, mammography, and others is carried out in the report. (
  • Computed Tomography Imaging. (
  • uted Axial Tomography) is a invaluable medical diagnostic imaging tool, which Uses a combination of X-ray s and computer technology. (
  • The data published with this paper is obtained during fatigue testing of a unidirectional non-crimp fabric based glass fibre composite by means of ex-situ X-ray CT and in-situ transilluminated white light imaging experiments. (
  • X-ray computed tomography (CT) is a method that permits non-destructive imaging and quantification of inner beneficial properties of gadgets. (
  • 6] S. Lou, X. Jiang, W. Zeng, H. Abdul-Rahman, P. J. Scott, Investigation of the compatibility of XCT measurement data to surface topography analysis, Dimensional X-ray Computed Tomography Conference, 2016. (
  • Interventional studies, for example, are often carried out under C-arm CT guidance, where a flat detector and a small x-ray source rotate around the patient. (
  • Oral and maxillofacial surgery, as well as the planning of dental implants, often relies on the so-called digital volume tomography (DVT), which is a dedicated flat detector CT system for the patient head. (
  • The UGCT scanners have a modular construction: it is possible to choose the best X-ray source, magnification and detector for each scan. (
  • During this period, signals are repeatedly read from an X-ray detector 11 at a predetermined cycle. (
  • Apart from the higher transmittance, the fiber-coupled detector has a few characteristics that require attention when it is used for computed tomography, which are browning of the fiber, discontinuity in the image, image distortion, and dark spots in the chicken-wire pattern. (
  • It is common to construct an area X-ray detector with a scintillator, which converts X-rays to visible light, and a camera to observe the scintillation. (
  • The capabilities of the CCD such as its good linearity, fast readout and high sensitivity make it a competitive X-ray detector. (
  • Originally developed for medical technology, this process places the object on a rotary table between an X-ray source and a detector. (
  • Using multiple slide axes, separate positioning of the X-ray detector and other sensors is possible. (
  • By changing the distance between the work piece and the detector, and the work piece and the X-ray source, different magnifications and measurement ranges can be obtained Either precise acquisition of small parts at high magnification or rapid acquisition of larger parts at lower magnification is possible. (
  • A prototype Medipix based silicon detector is calibrated using X-ray fluorescence. (
  • The system consists of an X-ray tube, a detector made of a GOS scintillator and an EBCCD camera, the movement axes, a vertical moving axis for the tube, a horizontal-vertical axis for the detector, and a rotating platform for the globe. (
  • In an X-ray computed-tomography apparatus of an embodiment, a reconstruction processing unit reconstructs image data based on projection data that is generated from output of an X-ray detector. (
  • Contrary to conventional tomography systems, the ROFEX systems do not achieve this by mechanical rotation of the object or source-detector-compound. (
  • In an X-ray scanning apparatus mounted with a photon counting type radiation detector, a data processing device of the X-ray scanning apparatus includes a. (
  • In 1961, he built a prototype in which an X-ray source and a mechanically coupled detector rotated around the object to be imaged. (
  • A multi-sensor coordinate measure machine with X-ray computed tomography can make accurate measurements during the first out of tool inspection, as well as for the full first article inspection. (
  • Measurements of BMD by DXA of the lumbar spine, hip (and subregions), and forearm (and subregions), quantitative computed tomography (QCT) of the spine and hip (n = 59), and radiographs of the thoracolumbar spine were performed on all subjects to assess prevalent vertebral fractures. (
  • Cross-sectional studies have shown that measurements of bone mineral density (BMD) by dual x-ray absorptiometry (DXA) and QCT predict incident fracture and are strongly associated with prevalent fracture ( 5-7 ). (
  • This technique enables measurements at isolated high-energy ranges, in which the dominating undergoing interaction between the x-ray and the sample is the incoherent scattering. (
  • In this paper we consider the task of classifying materials into explosives and non-explosives according to features obtainable from Multi-Energy X-ray Computed Tomography (MECT) measurements. (
  • X-ray computed tomography (CT), based on the measurement of x-ray attenuation from a multitude of view angles around the patient, is the workhorse of the radiologist. (
  • Ultrafast X-ray computed tomography has been primarily developed for the non-invasive measurement of the phase distribution within two-phase flows in vertical pipes. (
  • In this Thesis, I present the use of X-ray computed tomography (XCT) for surface measurement, for the purpose of verification and process improvement in an AM context. (
  • 4D Computed Tomography inspection is revolutionary for in situ testing applications such as compression, traction and similar processes. (
  • To relate to in situ field conditions, the results of these two laboratory mixes were supplemented with X-ray CT results of field cores from in-service perpetual pavement (PP) sections. (
  • It is difficult to obtain low-dose three-dimensional images of a long sample with high spatial resolution in a single scan using conventional X-ray micro-CT technique because the synchrotron X-ray beam is prolate. (
  • Spiral scanning is induced into synchrotron X-ray micro-CT (SR -CT) to resolve this problem. (
  • Long having been central tools in geological research, X-ray analytical techniques have become more powerful with small spot excitation, mapping and standardless quantitative analysis. (
  • While traditional Earth-Science approaches typically apply physical and/or chemical analytical techniques, X-ray computed tomography (XCT) as widely used in modern Medicine and Diagnosis has only recently been identify as powerful tool to add quantitative 3D-morphometric information of core samples to study the archive of Earth history or its natural resources. (
  • Initially, trabecular bone, with its high surface area and high turnover rate, is most affected by glucocorticoids, with reports of an 8% loss of trabecular bone as measured by quantitative computed tomography (QCT) in patients initiating prednisone therapy at a dosage of 10 mg/day for 6 months ( 4 ). (
  • An overview of X-ray CT data analysis techniques starting with basic image processing and leading to traditional segmentation, machine learning based segmentation and quantitative analysis. (
  • A methodology for obtaining visual and quantitative root structure information from X-ray computed tomography data acquired in-soil is presented. (
  • The overall goal of this procedure is to extract quantitative information on plant roots from in-soil X-ray computed tomography data. (
  • High-resolution X-ray computed tomography offers the potential to surmount these inherent problems and allow quantitative analysis in three-dimensions. (
  • The gray levels in a CT slice image correspond to X-ray attenuation, which reflects the proportion of X-rays scattered or absorbed as they pass through each voxel. (
  • X-ray attenuation is primarily a function of X-ray energy and the density and composition of the material being imaged. (
  • This decrease is characterized by Beer's Law, which describes intensity reduction as a function of X-ray energy, path length, and material linear attenuation coefficient. (
  • A specialized algorithm is then used to reconstruct the distribution of X-ray attenuation in the volume being imaged. (
  • where I 0 and I are the initial and final X-ray intensity, µ is the material's linear attenuation coefficient (units 1/length) and x is the length of the X-ray path. (
  • This complicates absolute calibration, as effective attenuation is a function of both the X-ray spectrum and the properties of the scan object. (
  • The dominant physical processes responsible for X-ray attenuation for most laboratory X-ray sources are photoelectric absorption and Compton scattering. (
  • In general for geological materials, the photoelectric effect is the dominant attenuation mechanism at low X-ray energies, up to approximately 100-150 keV, after which Compton scatter predominates. (
  • The variance of the image noise in computed X-ray transmission tomography (CT) due to quantum noise is in a first approximation a nonlinear function of X-ray attenuation. (
  • High resolution X-ray computed tomography (HRXCT) is a non-destructive method which uses contrasts of X-ray attenuation in a series of contiguous radiographs with different view angles to reconstruct the 3D distribution of areas of different densities within a large variety of materials. (
  • Due to their similar X-ray attenuation coefficients and densities, the roots of different plants appear as similar greyscale intensity values in µCT image data. (
  • These arise because of the higher linear attenuation of most materials at lower energy which shifts the mean energy of the X-ray spectrum towards higher energies as the beam passes through the object. (
  • Measuring root traits in barley (Hordeum vulgare ssp vulgare and ssp spontaneum) seedlings using gel chambers, soil sacs and X‐ray microtomography. (
  • In a well-calibrated system using a monochromatic X-ray source (i.e. synchrotron or gamma-ray emitter) this equation can be solved directly. (
  • Gamma-Ray Computed Tomography in Soil Science: Some Applications, Computed Tomography Luca Saba, IntechOpen, DOI: 10.5772/23863. (
  • Gamma ray tomography is well suited to determination of phase fraction distributions (gas, liquid, solid) in heavy and dense industrial devices and machines, such as axial compressors, pumps, hydro-dynamic couplings, thermal hydraulic facilities, pipelines, reactors, distillation columns and other components of larger process plants. (
  • For that we developed and operate a high resolution and transportable gamma-ray computed tomography scanner. (
  • Functional principle and setup of the HZDR gamma-ray computed tomography scanner. (
  • Gamma-ray computed tomography to evaluate changes in the structure of a clayey soil due to agricultural traffic. (
  • The objective of this study was to investigate the sensibility of the gamma-ray CT technique as a method for assessing the structural deformations to soils compacted by agricultural machinery traffic and to characterize the soil bulk density and porosity modifications with millimetric resolution. (
  • Both investigations of the use of low-flux neutron CT at the Royal Military College in Kingston compared to high-flux neutron CT at the Advanced Neutron Tomography And Radiography Experimental System (ANTARES) at FRM-II in Garching, Munich and the use of megavoltage gamma ray computed tomography at Kingston General Hospital in Kingston successfully imaged the corroded metal artifacts. (
  • The present invention relates to an X-ray computed tomography apparatus including an X-ray tube and multi-slice X-ray detectors. (
  • In a conventional apparatus, the intensity of X-ray generated during a helical scan is maintained at a constant value. (
  • Microfocus X-ray computed tomography (CT) scanning is a three-dimensional (3D) non-destructive technique that is useful in many research and technology fields. (
  • The analysis was based on the X-ray Computed Tomography (X-ray CT) scanning tests and subsequent image analyses. (
  • X-ray CT scanning tests were conducted on cylindrical HMA samples (150 mm diameter) that were gyratory laboratory-moulded to two different heights of 110 and 164 mm. (
  • In this docent lecture, Dr. Guarin will summarize the use of x-ray computed tomography at KTH for advanced characterization of the internal microstructure of materials, as a tool for the development of innovative and sustainable road infrastructure. (
  • Computed tomography requires radiographic projections from different angles. (
  • In this study A . colombia is redescribed based on external morphology and a detailed osteological description of the skull, prepared by high-resolution x-ray computed tomography. (
  • Fidélis Júnio Marra Santos and Roberto E. Reis "Redescription of the Blind Snake Anomalepis colombia (Serpentes: Anomalepididae) Using High-Resolution X-Ray Computed Tomography," Copeia 107(2), 239-243, (1 May 2019). (
  • Current µ-focus X-Ray systems offer high resolution and advanced detail detectability. (
  • The dark-field CT results are compared with and verified by applying high-resolution absorption X-ray computed tomography and a subsequent data-evaluation pipeline to determine fibre length and fibre orientation of each fibre in the investigated volume. (
  • The purpose of this study is to present a novel algorithm to combine high-resolution X-ray Computed Tomography (HRXCT) and Double-Pulse Laser-Induced Breakdown Spectroscopy (DP LIBS) for geological samples' analysis. (
  • Although it was commercialized in 70's, with the recent development of high resolution (down to 20 nm) laboratory and synchrotron radiation tomography has been revolutionized. (
  • High resolution computed tomography scanned images are acquired and the image quality is improved using digital image processing techniques. (
  • Adderley WP, Simpson I & MacLeod G (2001) Testing High-resolution X-ray Computed Tomography for the Micromorphological Analyses of Archaeological Soils and Sediments, Archaeological Prospection, 8 (2), pp. 107-112. (
  • This paper demonstrates this and presents a test of the high-resolution computed tomography method against conventional thin-section micromorphology. (
  • Because this is an X-ray Computed Tomography process, both the internal and external structures of an object are obtained. (
  • The latter is needed for angle-synchronized computed tomography of rapidly rotating structures, such as in pumps or stirred vessels. (
  • In order to determine axial velocities of structures within the object of investigation the ROFEX systems comprise a second tomography plane, which is driven intermittently to the first one, if required. (
  • Quantifying the structures of aerated foods, and understanding the dynamic processes and formulation/ingredient effects that contribute to these structures, remain challenges to which X-Ray Computed Tomography (XCT) offers valuable insights. (
  • The results show promising applications of phase-contrast X-ray computed tomography for non-destructive testing and evaluation of fibre-reinforced polymers. (
  • The applications of Computed Tomography (CT) are vast, spanning several industries and disciplines. (
  • X-ray dual spectral CT (DSCT) scans the measured object with two different x-ray spectra, and the acquired rawdata can be used to perform the material decomposition of the object. (
  • Similar to two-dimensional (2D) X-ray inspections, this 3D technology allows the investigation of almost any material down to 1 micron spatial resolution and higher. (
  • These include improved signal (and contrast) to noise ratio, reduced X-ray dose to the patient, improved spatial resolution and, through use of several energy bins, the ability to distinguish multiple contrast agents. (
  • It's possible to install different peripheral equipment to the scanners, allowing the creation of certain experimental conditions during the scans, greatly improving the possibilities of X-ray CT research. (
  • Also searched for Computed tomography , CT Scans , and Computerized tomography . (
  • This paper presents the evaluation of an image quality measure for X-ray computed tomography (XCT) scans. (
  • of balance.Tests:CT scan (Computed tomography (CT) scans are completed with the use of a 360-degree x-ray beam and computer production of images. (
  • 4D X-ray Computed Tomography allows users to reconstruct a complete 3D CT model that includes time and motion, creating a truly dynamic volumetric dataset. (
  • Correlative analysis of the same specimens was performed by in vivo and ex vivo helical computed tomography (HCT) and ex vivo μCT. (
  • The sample significantly absorbs X-ray photons, thus demonstrating that the Nd 3+ -doped Ba 0.3 Lu 0.7 F 2.7 nanospheres are good candidates as contrast agents in computed tomography. (
  • At BL20B2, an X-ray beam with a cross section of 300 mm (width) by up to 30 mm (height) is available. (
  • As the beam quality used during an examination has a central role for both dosimetry and image quality, a toolkit was developed that can be used to model x-ray spectra emerging from an x-ray tube in Paper IV. (
  • The X-ray source is a reduced power source and a beam hardening filter of reduced size is positioned proximal to the X-ray source so the scanner uses a relatively soft X-ray beam. (
  • By using conventional X-ray computed tomography, a three-dimensional distribution of the X-ray absorption coefficient can be detected. (
  • However, the operational flexibility of these devices is restricted by their inability to record sufficient x-ray transmission data to reconstruct more than a single 5-15mm thick cross section of tissue during one scan and the relatively long duration (2-60s) for each scan. (
  • X-ray computed tomography (CT) images of transaxial cross sections of the body can be used to determine tissue volumes. (
  • This X-ray intensity control is effective in a single-slice scan shown in FIG. 1B. (
  • As shown in FIG. 2B, however, X-ray intensity cannot be satisfactorily optimized for a multi-slice scan (also called a volume scan). (
  • It is an object of the present invention to further optimize X-ray intensity in a multi-slice scan. (
  • 2. A system according to claim 1, wherein the X-ray generating means includes a source of X-rays operable at a rated power of less than about 12 kW, but sufficient to perform a scan. (
  • 3. A system according to claim 1, wherein the X-ray generating means includes an anode and a cathode, means for maintaining the anode at a potential different from the cathode and means for generating a current between the cathode and the anode so that the rated power is sufficient to perform a scan, but less than 12 kW. (
  • CT Scan is a special type of x-ray used as a detailed cross section of a specific area of the body. (
  • Another test to determine if it is indeed cancer is the less common CT scan: "An x-ray machine linked to a computer takes a series of detailed pictures of your organs. (
  • For example, in XCT, three-dimensional images are constructed from a set of x-ray projections, taken at several angels around the object. (
  • X-ray projections for a honeybees scanned in the Micro CT. (
  • However, the number of the fluorescent x-ray photons are restricted by the pinhole, leading to acquisition of low S/N projections due to the photon starvation. (
  • A simple method to evaluate the X-ray-exposure-to-accuracy performance of the CT system was developed and applied. (
  • Although there is a general understanding that the fiber-coupling is more efficient (brighter) than the lens-coupling, the lens-coupling is still widely used for computed tomography (CT) at synchrotron radiation facilities. (
  • Computed Tomography (CT) is widely used to check the mechanical form and fit of assemblies. (
  • Computed tomography (CT) is the preferred way for 3-dimensional analysis of state-of-the-art semiconductor packaging solutions, such as System-in-a-Package, as well as general complex assemblies. (
  • Our X-ray (DR) and computer tomography (CT) system is designed to meet the requirements for safe, reliable, non-destructive testing of electronic, microelectronic, electromechanical and other small products. (
  • Recovering complete plant root system architectures from soil via X‐ray mu‐Computed Tomography. (
  • This study presents a systematic method to examine the characteristics of the REV using X-ray computed tomography images. (
  • Present commercial x-ray computed tomography (CT) scanners are capable of producing single cross section images of the head, thorax, or abdomen which exhibit both high spatial and halftone resolution as described by Brooks and DiChiro (1976). (
  • A series of X-ray images of the object are taken at numerous rotary table positions. (
  • A mathematical process allows reconstruction of the spatial contour of the component from the X-ray images. (
  • X-ray images taken around a single rotation of the specimen. (
  • High quality X-ray images in oblique view allow for the detailed observations. (
  • X-ray images help identify material defects and quality characteristics that influence the shape of the solder joint. (
  • X-ray images provided new insights into the interplay of pharmaceutical ingredients and the importance of excipient surface structure on drug release overtime. (
  • Visual tracking for the recovery of multiple interacting plant root systems from X‐ray μCT images. (
  • RooTrak: Automated recovery of three‐dimensional plant root architecture in soil from x‐ray microcomputed tomography images using visual tracking. (
  • Project DIR3CT aims at improving the image quality of CBCT images by deep learning (DL) the 3D reconstruction from X-ray images end-to-end. (
  • NSI s patent pending product is something never seen before and is considered the future of industrial 3D X-ray inspection. (
  • A number of X-ray CT application examples of geological samples will be discussed, including the analysis of cracks, pores, inclusions, and phase quantification of rocks and drill cores. (
  • By means of a Talbot-Lau X-ray interferometer differential phase contrast tomography can be realized. (
  • X-ray computed tomography (XCT) is a technique that uses x-rays to image the three dimensional structure of objects. (
  • X-ray micro-computed tomography (XμCT) allows a non-destructive and three-dimensional (3D) study of otherwise complex and opaque wood tissues. (
  • Neutron-, gamma- and X-ray three-dimensional computed tomography at the Budapest research reactor site. (
  • In this study we used soil 2D zymography and X-ray computed tomography (μCT) to assess the relationship between enzymes and pores. (
  • Housed at the Shared Materials Instrumentation Facility (SMIF) at Duke's Pratt School of Engineering, the XTH 225 ST micro CT X-ray machine from Nikon Metrology (Brighton, MI) along with Nikon's 3D reconstruction software was installed in March 2013 and envisioned from the start as a shared university resource. (
  • These results suggest the potential for improved detection performance relative to conventional dual-energy X-ray systems. (
  • To study the feasibility of using 2-deoxy- d -glucose (2-DG)-labeled gold nanoparticle (AuNP-DG) as a computed tomography (CT) contrast agent with tumor targeting capability through in vitro experiments. (
  • X-ray computed tomography experiments are carried out on powder samples of the latter composition. (
  • The observation of the ice grains was carried out by using synchrotron radiation-sourced X-ray CT (computed tomography). (
  • Synchrotron radiation-based X-ray micro computed tomography was used for the evaluation of eventual changes in the microstructure of the matrix tablets during dissolution and after long-term storage. (
  • To our knowledge X-ray micro computed tomography has not been used yet for the evaluation of the microstructure of lipid matrix tablets before and during dissolution, and after storage at 40° and 75 % relative humidity. (
  • Thanks to the rapid development of both the X-ray tubes as the detectors, we can image objects with continuously better resolution. (
  • In this thesis, the applicability of such detectors to X-ray Computed Tomography (CT) is studied. (
  • Although these hybrid components are often found within X-ray absorbing housings of tungsten and copper, which absorb X-rays to a high degree, high-contrast microfocus YXLON X-ray systems and detectors can be successful in solder joint inspection. (
  • The disclosed CT scanner includes an X-ray source and an array of X-ray detectors fixed to a reduced geometry disk which is supported for rotation about an isocenter of the disk. (
  • The scanner further includes circuitry for compensating for non-linearities and channel-to-channel variation in the X-ray detectors. (
  • The newest webinar in the series, "X-ray Computed Tomography for Materials and Life Science" will cover analysis of geological samples. (
  • We employ 'state-of-the-art', 3D, non-destructive microCT (X-ray) technologies and innovative image analysis techniques to explore and quantify the internal architecture of biomaterials and support research into environmental sustainability and global food security. (
  • In this study, the X-ray Computed Tomography (X-ray CT) scanner and subsequent image analysis techniques were used to characterise the AV distribution (i.e. (
  • In the paper, the X-ray CT scanner and the concepts of image analysis are described first, followed by the experimental design plan and the laboratory test results including the effects of the AV distribution on the DT test failure mode. (
  • However, this paper presents X-ray computed micro-tomography as a new laboratory method in this field, which also allows for 3D visualization and analysis of iron sulphide distribution in roofing slates. (
  • Recent research has shown this complex suite of processes can now be observed in a natural environment (i.e. soil) through the use of X-ray micro Computed Tomography (µCT), which allows non-destructive analysis of plant root systems. (
  • Besides clinical computed tomography, several other medical CT modalities are in use, today. (
  • Using X-ray CT, 3D geometries of soil structure and pore spaces can now be used as parameters in numerical simulations that calculate their hydraulic properties. (
  • We present a technique, based on a visual tracking approach, which exploits knowledge of the shape of root cross-sections to automatically recover 3D descriptions of multiple, interacting root architectures growing in soil from X-ray µCT data. (
  • during this ebook, a variety of purposes of X-ray CT within the geosciences are illustrated by way of papers overlaying quite a lot of disciplines, together with petrology, soil technology, petroleum geology, geomechanics and sedimentology. (
  • Due to the low X-ray contrast difference between carbon fibers and epoxy resin matrix, these fiber bundles are not detectable by means of conventional absorption contrast. (
  • It is important to find cracks, open solder joints or voids via X-ray inspection. (
  • YXLON X-ray inspection technology is used in the production of multilayer printed circuit boards to measure the position offset and minimal residual ring width. (
  • The ball-grid array (BGA) shown in below figure is a form of component in which the solder joints are hidden between the component and circuit board As a result, X-ray technology offers the only way to perform a complete quality inspection of the solder joints. (