Tomography, X-Ray Computed: Tomography using x-ray transmission and a computer algorithm to reconstruct the image.Tomography: Imaging methods that result in sharp images of objects located on a chosen plane and blurred images located above or below the plane.Positron-Emission Tomography: 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.Tomography, Optical Coherence: 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, Emission-Computed: Tomography using radioactive emissions from injected RADIONUCLIDES and computer ALGORITHMS to reconstruct an image.Tomography, Spiral Computed: 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.Tomography, Optical: 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.Gamma Rays: 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.Radiography: 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).Multidetector Computed Tomography: Types of spiral computed tomography technology in which multiple slices of data are acquired simultaneously improving the resolution over single slice acquisition technology.Tomography, Emission-Computed, Single-Photon: 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.Cone-Beam Computed Tomography: Computed tomography modalities which use a cone or pyramid-shaped beam of radiation.Electron Microscope Tomography: A tomographic technique for obtaining 3-dimensional images with transmission electron microscopy.Tomography, X-Ray: Tomography using x-ray transmission.Electron Probe Microanalysis: 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.Fluorodeoxyglucose F18: 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)Pneumoconiosis: 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.Elasmobranchii: 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.Tomography Scanners, X-Ray Computed: 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.Skates (Fish): 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.Imaging, Three-Dimensional: 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.Radiation Dosage: 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).Sensitivity and Specificity: 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)Fast Neutrons: Neutrons, the energy of which exceeds some arbitrary level, usually around one million electron volts.Radiology Department, Hospital: Hospital department which is responsible for the administration and provision of x-ray diagnostic and therapeutic services.Reproducibility of Results: 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.Magnetic Resonance Imaging: 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.Wrist Joint: 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).Image Processing, Computer-Assisted: 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.Prospective Studies: 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.Retrospective Studies: 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.Radiation Effects: 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.Predictive Value of Tests: 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.Ultraviolet Rays: 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.Teleradiology: 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)Spectrometry, X-Ray Emission: 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.Dose-Response Relationship, Radiation: The relationship between the dose of administered radiation and the response of the organism or tissue to the radiation.Metacarpophalangeal Joint: The articulation between a metacarpal bone and a phalanx.Aluminum Silicates: 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)Animal Fins: Membranous appendage of fish and other aquatic organisms used for locomotion or balance.Metacarpus: The region of the HAND between the WRIST and the FINGERS.Phantoms, Imaging: 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)Observer Variation: 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).Radiographic Image Interpretation, Computer-Assisted: Computer systems or networks designed to provide radiographic interpretive information.X-Ray Microtomography: X-RAY COMPUTERIZED TOMOGRAPHY with resolution in the micrometer range.Time Factors: Elements of limited time intervals, contributing to particular results or situations.X Chromosome: 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.Cathode Ray Tube: 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.Fluorine Radioisotopes: Unstable isotopes of fluorine that decay or disintegrate emitting radiation. F atoms with atomic weights 17, 18, and 20-22 are radioactive fluorine isotopes.Multimodal Imaging: 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.Craniocerebral Trauma: 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.Pleura: 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.Asbestosis: 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.Lung: Either of the pair of organs occupying the cavity of the thorax that effect the aeration of the blood.Diagnostic Errors: Incorrect diagnoses after clinical examination or technical diagnostic procedures.Emergency Service, Hospital: Hospital department responsible for the administration and provision of immediate medical or surgical care to the emergency patient.Radiometry: The measurement of radiation by photography, as in x-ray film and film badge, by Geiger-Mueller tube, and by SCINTILLATION COUNTING.Cadmium Radioisotopes: 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.Foreign Bodies: Inanimate objects that become enclosed in the body.Dental Technicians: Individuals responsible for fabrication of dental appliances.Follow-Up Studies: 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.Diagnostic Imaging: 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.Radiation Genetics: A subdiscipline of genetics that studies RADIATION EFFECTS on the components and processes of biological inheritance.Cosmic Radiation: 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.Calcaneus: The largest of the TARSAL BONES which is situated at the lower and back part of the FOOT, forming the HEEL.Occupational Diseases: Diseases caused by factors involved in one's employment.Quartz: Quartz (SiO2). A glassy or crystalline form of silicon dioxide. Many colored varieties are semiprecious stones. (From Grant & Hackh's Chemical Dictionary, 5th ed)Bone Diseases, MetabolicAsbestos: 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.Severity of Illness Index: Levels within a diagnostic group which are established by various measurement criteria applied to the seriousness of a patient's disorder.Four-Dimensional Computed Tomography: Three-dimensional computed tomographic imaging with the added dimension of time, to follow motion during imaging.Radiographic Image Enhancement: 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.Brain: 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.Contrast Media: Substances used to allow enhanced visualization of tissues.Arthritis, Rheumatoid: 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.Occupational Exposure: The exposure to potentially harmful chemical, physical, or biological agents that occurs as a result of one's occupation.Treatment Outcome: 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.Radiography, Abdominal: Radiographic visualization of the body between the thorax and the pelvis, i.e., within the peritoneal cavity.Radiation Tolerance: 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.Calcinosis: Pathologic deposition of calcium salts in tissues.Lung Neoplasms: Tumors or cancer of the LUNG.Algorithms: A procedure consisting of a sequence of algebraic formulas and/or logical steps to calculate or determine a given task.Osteoporosis: 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.Radiography, Thoracic: X-ray visualization of the chest and organs of the thoracic cavity. It is not restricted to visualization of the lungs.Spinal Osteophytosis: 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.Fractures, Bone: Breaks in bones.Macula Lutea: 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)Tibia: 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.Coronary Angiography: Radiography of the vascular system of the heart muscle after injection of a contrast medium.Bone and Bones: 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.Equipment Design: Methods of creating machines and devices.Oxygen Radioisotopes: 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.Carbon Radioisotopes: Unstable isotopes of carbon that decay or disintegrate emitting radiation. C atoms with atomic weights 10, 11, and 14-16 are radioactive carbon isotopes.Metallurgy: 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)Cervical Vertebrae: The first seven VERTEBRAE of the SPINAL COLUMN, which correspond to the VERTEBRAE of the NECK.Diagnostic Techniques, Ophthalmological: Methods and procedures for the diagnosis of diseases of the eye or of vision disorders.Spinal DiseasesPrognosis: 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.Femur: The longest and largest bone of the skeleton, it is situated between the hip and the knee.Image Enhancement: 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.Coronary Artery Disease: Pathological processes of CORONARY ARTERIES that may derive from a congenital abnormality, atherosclerotic, or non-atherosclerotic cause.Cerebrovascular Circulation: The circulation of blood through the BLOOD VESSELS of the BRAIN.Bronchography: Radiography of the bronchial tree after injection of a contrast medium.Disease Progression: 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.Vital Capacity: The volume of air that is exhaled by a maximal expiration following a maximal inspiration.X-Rays: 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.Anatomy, Cross-Sectional: 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)Nerve Fibers: 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.Optic Disk: 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.X-Ray Diffraction: 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)Infrared Rays: 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.Emergencies: Situations or conditions requiring immediate intervention to avoid serious adverse results.Hand: The distal part of the arm beyond the wrist in humans and primates, that includes the palm, fingers, and thumb.Knee Joint: A synovial hinge connection formed between the bones of the FEMUR; TIBIA; and PATELLA.Artifacts: 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.EnglandPseudotsuga: 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.Incidental Findings: 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.Optical Phenomena: LIGHT, it's processes and properties, and the characteristics of materials interacting with it.Sensilla: 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.Body Composition: The relative amounts of various components in the body, such as percentage of body fat.Cross-Sectional Studies: 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 Factors: 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.Factor X: 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.Chorioallantoic Membrane: 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.Risk Factors: 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.Dust: Earth or other matter in fine, dry particles. (Random House Unabridged Dictionary, 2d ed)Blood Sedimentation: Measurement of rate of settling of erythrocytes in anticoagulated blood.Angiography: Radiography of blood vessels after injection of a contrast medium.Bone Density: 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.Case-Control Studies: 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.Mutation: 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.Organotechnetium Compounds: Organic compounds that contain technetium as an integral part of the molecule. These compounds are often used as radionuclide imaging agents.Hip Joint: The joint that is formed by the articulation of the head of FEMUR and the ACETABULUM of the PELVIS.Cryoelectron Microscopy: 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.Feasibility Studies: Studies to determine the advantages or disadvantages, practicability, or capability of accomplishing a projected plan, study, or project.Solitary Pulmonary Nodule: 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.Anthropometry: The technique that deals with the measurement of the size, weight, and proportions of the human or other primate body.Thallium Radioisotopes: Unstable isotopes of thallium that decay or disintegrate emitting radiation. Tl atoms with atomic weights 198-202, 204, and 206-210 are thallium radioisotopes.Visual Acuity: 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, Electron, Scanning: 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.Ultrasonography: 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.Equipment Failure Analysis: 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.Cobalt Radioisotopes: Unstable isotopes of cobalt that decay or disintegrate emitting radiation. Co atoms with atomic weights of 54-64, except 59, are radioactive cobalt isotopes.Fluorescein Angiography: 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.Bermuda: 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)Forced Expiratory Volume: 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.Optics and Photonics: 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.TailCrohn Disease: 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.Aortography: Radiographic visualization of the aorta and its branches by injection of contrast media, using percutaneous puncture or catheterization procedures.Solar Activity: Any type of variation in the appearance of energy output of the sun. (NASA Thesaurus, 1994)Optic Nerve Diseases: 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.Coronary Stenosis: Narrowing or constriction of a coronary artery.Referral and Consultation: The practice of sending a patient to another program or practitioner for services or advice which the referring source is not prepared to provide.Pinus ponderosa: A plant species of the genus PINUS that contains isocupressic acid.Myocardial Perfusion Imaging: 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.Coronary Vessels: The veins and arteries of the HEART.Radioisotopes: 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)Osteoarthritis, Knee: 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)Infant, Newborn: An infant during the first month after birth.Skull: The SKELETON of the HEAD including the FACIAL BONES and the bones enclosing the BRAIN.Cohort Studies: 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.Retinal Ganglion Cells: 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.Linear Energy Transfer: 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).Macular Edema: 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)Preoperative Care: 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)Technetium Tc 99m Sestamibi: A technetium imaging agent used to reveal blood-starved cardiac tissue during a heart attack.LondonRetina: 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.Interferometry: 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).Neoplasm Staging: Methods which attempt to express in replicable terms the extent of the neoplasm in the patient.Retinal DiseasesNitrogen Radioisotopes: 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 Tracers: 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)ROC Curve: 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.Copper Radioisotopes: 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.Cystic Fibrosis: 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.Reference Values: 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.Absorptiometry, Photon: 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.Ophthalmoscopy: Examination of the interior of the eye with an ophthalmoscope.Refractometry: 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).Gallium Radioisotopes: 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.Iopamidol: A non-ionic, water-soluble contrast agent which is used in myelography, arthrography, nephroangiography, arteriography, and other radiological procedures.Raclopride: A substituted benzamide that has antipsychotic properties. It is a dopamine D2 receptor (see RECEPTORS, DOPAMINE D2) antagonist.Hematoma: A collection of blood outside the BLOOD VESSELS. Hematoma can be localized in an organ, space, or tissue.Radionuclide Imaging: 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.Mediastinum: 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.Glaucoma: 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)Subtraction Technique: 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).Radius: The outer shorter of the two bones of the FOREARM, lying parallel to the ULNA and partially revolving around it.Heart: The hollow, muscular organ that maintains the circulation of the blood.Environmental Exposure: 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.Cardiac-Gated Imaging Techniques: Timing the acquisition of imaging data to specific points in the cardiac cycle to minimize image blurring and other motion artifacts.Iodine Radioisotopes: Unstable isotopes of iodine that decay or disintegrate emitting radiation. I atoms with atomic weights 117-139, except I 127, are radioactive iodine isotopes.Optical Processes: Behavior of LIGHT and its interactions with itself and materials.Metatarsal Bones: The five long bones of the METATARSUS, articulating with the TARSAL BONES proximally and the PHALANGES OF TOES distally.Fatal Outcome: 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.Relative Biological Effectiveness: 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.Ultrasonography, Interventional: 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.Fundus Oculi: 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)

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)

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 ...
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
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 ...
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.
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?
RiTradiology.com ดูแลรักษาโดยและเป็นของ น.พ.รัฐชัย แก้วลาย. โลโก้ RiTradiology.com เป็นลิขสิทธิ์ของ น.พ.รัฐชัย แก้วลาย. ข้อมูลส่วนตัวของคุณถือเป็นความลับและจะไม่ถูกเผยแพร่ไปยังบุคคลที่สาม. ข้อมูลใน RiTradiology.com ใช้เป็นแนวทาง, ไม่ใช่เพื่อทดแทน, การให้การวินิจฉัย, รักษาและคำแนะนำสำหรับผู้ป่วย. แพทย์ของคุณอาจให้คำแนะนำในการวินิจฉัยหรือรักษาเป็นอย่างอื่นขึ้นกับข้อมูลและสถานการณ์นั้นๆ. ...
... 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...
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 ...
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 ...
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) ...
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.
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
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
{ 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.. ...
A traditional CT scan is an x-ray procedure that combines many x-ray images with the aid of a computer to generate cross-sectional views of the body. Cardiac CT uses the advanced CT technology with intravenous (IV) contrast (dye) to visualize your cardiac anatomy, coronary circulation and great vessels. Cleveland Clinic uses state-of-the-art multi-row detector CT scanners. With multi-slice scanning, it is possible to acquire high-resolution three-dimensional images of the moving heart and great vessels.. A cardiac computed tomography also may be called a coronary CT angiography, MSCT, CT, cardiac CT, coronary CTA or cardiac CAT scan.. ...
X-ray computed tomography, also computed tomography (CT scan) or computed axial tomography (CAT scan), is a medical imaging procedure that utilizes computer-processed X-rays to produce tomographic images or slices of specific areas of the body. These cross-sectional images are used for diagnostic and therapeutic purposes in various medical disciplines.. ...
Objectives Feasibility evaluation of the One-Step Stroke Protocol, which is an interleaved cerebral computed tomography perfusion (CTP) and neck volumetric computed tomography angiography (vCTA)...
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) ...
Bracco Diagnostics Inc. announced today it has partnered with Toshiba Medical Systems Corporation in supporting a landmark clinical trial aimed at assessing the viability of using multislice computed tomography (CT) as a primary diagnostic tool for detecting cardiovascular diseases and disorders, in comparison to cardiac catheterization. The study, named "CorE 64″ for "coronary evaluation on 64″ is the first multi-center clinical study to focus specifically on computed tomography angiography (CTA) using 64-slice CT technology. Patient evaluations are expected to take place for several months, and initial study results are planned for release in 2006.. Braccos contrast agent Isovue®-370, the highest concentration iodine agent approved for CT imaging in the United States, will be provided for non-invasive diagnostic imaging of cardiac patients in conjunction with Toshiba CT technologies, including the AquilionTM CFX 64-slice CT scanner, the 64-row Quantum Detector, as well as SURECardioTM ...
Cardiovascular Disease (CVD) is one of the leading causes of death both in United States and around the globe. The National Heart Lung and Blood Institutes 2007 disease statistics reported that, in 2004, 872,000 deaths or 36% of all deaths in the United States were due to cardiovascular disease.. One of the primary causes of CVD is a condition called coronary artery atherosclerosis, also known as coronary artery disease (CAD). Recent studies have established that the presence of calcified coronary plaques as detected from non-contrast computed tomography (CT) data has a significant predictive value for CAD in both symptomatic and asymptomatic patients. To that end, several risk scores have been developed to quantify the amount of coronary artery calcium (CAC) based on the data collected by CT. However, inspite of the vast amount of CAD-related information available from CT, only a small fraction of it is being used in existing risk scoring strategies. Additionally, most of these scores were ...
Computerized Tomography (CT) is a quick, non-invasive test that uses X-rays to capture images in sections as it moves around the body. A computer reassembles the image "slices" to produce clear and detailed images of the scanned area in a matter of seconds. The more slices a CT scanner can produce, the more information that can be captured.. CTA stands for computerized tomographic angiography and is a test that combines a conventional CT scan with the technique of angiography to create images of blood vessels in the body. Physicians may order a CTA to help diagnose a narrowing or blockage of arteries, an aneurysm, a pulmonary embolism or other vascular condition.. Advanced software enables the scanner to also be used for cardiac calcium scoring and imaging of the entire vascular system, possibly reducing the need for some other diagnostic procedures.. ...
Computed Tomography (CT or CAT) Scan of the Brain (Head CT Scan, Intracranial CT Scan) Procedure Overview What is a CT or CAT scan of the brain? 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 m ...
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Welcome to the Student Studyspace for The Norton Anthology of World Literature, Third Edition. This free student website helps students understand individual works and appreciate the places, sounds, and sights of literature. The site features a variety of review material, including: more than 50 multiple-choice reading comprehension quizzes on widely-taught individual works, 28 interactive maps, bulleted summaries of the anthology introductions, timelines, and literary places.. More information on this book.. ...
Please include your name, student number, and a detailed explanation of your situation in all email correspondence with the advisor.. Students can subscribe to the World Literature undergraduate email list for regular WL updates, upcoming event notifications and more.. Email [email protected]!. ...
Recent studies have shown that low-dose chest CT scans can detect lung cancers in high-risk populations (age ,50yo, ,30 pack-years of tobacco use), and can lower cancer mortality. Unfortunately, the vast majority of positive findings on these CT scans are benign (,95%). Currently, an inordinate amount of expensive follow-up testing is required for these patients to try to prove who among them truly has a cancer.. Several new emerging non-invasive and potentially cheaper tests are now being investigated to help differentiate patients with cancers versus just benign lung nodules. These new tests include a new type of sputum analysis, a breath analysis, a blood test measuring certain tumor markers, a blood test looking for auto-antibodies, and a standard PET/CT scan. Each of these tests have different sensitivity and specificity rates when looking for lung cancer, and it is unclear which test is best.. This study will employ a panel of all 5 of these non-invasive tests on an initial cohort of 50 ...
A computed tomography (CT) scan uses X-rays to make pictures of the head and face.. During the test, you will lie on a table that is attached to the CT scanner, which is a large doughnut-shaped machine. Your head will be positioned inside the scanner. The CT scanner sends X-rays through the head. Each rotation of the scanner provides a picture of a thin slice of the head and face. One part of the scanning machine can tilt to take pictures from different positions. All of the pictures are saved as a group on a computer. They also can be printed.. In some cases, a dye called contrast material may be put in a vein (IV) in your arm or into the spinal canal. The dye makes structures and organs easier to see on the CT pictures. The dye may be used to check blood flow and look for tumors, areas of inflammation, or nerve damage.. A CT scan of the head can give some information about the eyes, facial bones, air-filled cavities (sinuses) within the bones around the nose, and the inner ear. If these areas ...
Computed tomography (CT or CAT scan) 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 tissue. While much information can come from a standard X-ray, MRI captures much more detail about internal organs and other structures. In a CT scan, an X-ray beam moves in a circle around the body. This provides 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) form on a monitor. CT scans may be done with or without "contrast." Contrast refers to a substance taken by mouth or injected into an intravenous (IV) line that causes the particular ...
The central theme of the CORE-320 Multicenter Trial Labs research is to support the Coronary Artery Evaluation Using 320-Row Multidetector CT Angiography (CORE 320) study, a multi-center multinational diagnostic study with the primary objective to evaluate the diagnostic accuracy of 320-MDCT for detecting coronary artery luminal stenosis and corresponding myocardial perfusion deficits in patients with suspected CAD compared with the reference standard of conventional coronary angiography and SPECT myocardial perfusion imaging ...
Fig 1. A 61-year-old male patient with right hemiparesis imaged at 2.3 hours and 3 days. Abnormal areas are outlined on CBV (A), CBF (B), and follow-up CT (C) images. After coregistration, we defined 3 regions on CBF maps (D): region 1 (red), "infarct core"-abnormal on CBV, CBF, and follow-up CT images; region 2 (blue), "penumbra that infarcts"-normal on CBV but abnormal on CBF and follow-up CT images; and region 3 (green) "penumbra that recovers"-abnormal on CBF but normal on CBV and follow-up CT images. ...
We found that the total mean attenuation values of PAs were significantly higher in group A than in group B (532.7 ± 243 HU vs. 380.6 ± 232 HU, respectively) (Table 2). Additionally, total DLP and effective dose values were significantly lower in group A than in group B. Twenty-one patients (21%) in both groups were detected for PTE.. Pulmonary angiography is the gold standard in the diagnosis of PTE and the sensitivity and specificity of this technique has been reported to be 90% and 94%, respectively (13). Pulmonary angiography is an invasive procedure and is not widely available. On the other hand, CTPA is a non-invasive radiological imaging method using an multi-detector CT (MDCT) device with high sensitivity and specificity, low false negativity or false positivity ratios. CTPA is used widely in daily clinical applications for PTE diagnosis in many clinics (14).. One disadvantage of CTPA is the health risk associated with the radiation dose and amount of CM used. The radiation dose ...
OUTLINE: Low-dose CT scans are analyzed retrospectively for the natural progression of undetermined lung nodules. Nodule dimension will be evaluated according to maximum diameter and volume, when feasible. Volume measurements are performed using an automatic and semi-automatic computer-aided diagnosis (CAD) system. Lesion-specific and person-specific analysis are performed by measure of average change in size of the target lesions or number of lesions. ...
Definition : Computed tomography scanning systems that use a magnetically rotating electron beam and stationary tungsten "target" rings rather than a standard x-ray tube to generate x-rays. Because there is no mechanical motion, the scan times can be very short, on the order of 50 ms each or less. These systems are mainly designed to allow transaxial imaging of the beating heart, but due to their very rapid image acquisition, they can also be used in quantification of coronary artery calcification and pericardial disease, as well as in uses in which motion could affect image acquisition (e.g., pediatric, geriatric, or trauma patients).. Entry Terms : "CT Scanners, Electron Beam" , "CT Scanners, Ultra Fast" , "Scanners, Computed Tomography, Cine" , "Ultra-Fast Computed Tomography Systems" , "Scanning Systems, Computed Tomography, Ultra-Fast" , "Cine Computed Tomography Systems" , "Scanning Systems, Computed Tomography, Cine" , "Electron Beam Computed Tomography Systems". UMDC code : 16899 ...
A CT Angiogram involves an injection of x-ray dye through a vein in the arm to enhance the vessels, which are then imaged using the CT scanner.
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.
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.
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.
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.
Why Low Dose CT Vs. Standard CT or a Chest X-ray?. Standard CT scans of the chest provide more detailed pictures than chest x-rays and are better at finding small abnormalities in the lungs. Low-dose CT of the chest uses lower amounts of radiation than a standard chest CT but it is more than the dose from a chest x-ray. So LDCT is a balance, offering the detail closer to standard CT with the radiation dose closer to a chest x-ray.. Do all imaging centers provide Low Dose CT Lung Cancer Screening?. No. Not all imaging centers have Low Dose CT scanners. Screening should only be done at facilities that have the right type of CT scanner and have developed a proper Low Dose CT imaging protocol specific for Lung Cancer Screening. University Medical Imaging was the first to provide Low Dose CT to the Rochester Community in 2006 and is the community leader in reduced dose CT.. Is this test right for me?. Low Dose CT Lung Cancer Screening is not recommended for everyone. Individuals interested in ...
Why Low Dose CT Vs. Standard CT or a Chest X-ray?. Standard CT scans of the chest provide more detailed pictures than chest x-rays and are better at finding small abnormalities in the lungs. Low-dose CT of the chest uses lower amounts of radiation than a standard chest CT but it is more than the dose from a chest x-ray. So LDCT is a balance, offering the detail closer to standard CT with the radiation dose closer to a chest x-ray.. Do all imaging centers provide Low Dose CT Lung Cancer Screening?. No. Not all imaging centers have Low Dose CT scanners. Screening should only be done at facilities that have the right type of CT scanner and have developed a proper Low Dose CT imaging protocol specific for Lung Cancer Screening. University Medical Imaging was the first to provide Low Dose CT to the Rochester Community in 2006 and is the community leader in reduced dose CT.. Is this test right for me?. Low Dose CT Lung Cancer Screening is not recommended for everyone. Individuals interested in ...
Heart disease, in the news recently because of former President Bill Clinton s quadruple coronary artery bypass surgery, is one of the leading causes of death worldwide. According to SNM members Simona Ben-Haim, M.D., and Ora Israel, M.D., "combined positron emission tomography and computed tomography may be helpful in the detection of early abnormalities in the arterial wall." They said, "These abnormalities may be the cause of future severe cardiovascular events … the PET/CT scan may be potentially useful in early detection of disease, prevention, monitoring response to therapy and prognosis." This preliminary study, which took more than three years, could establish a role for nuclear medicine as a noninvasive imaging tool for atherosclerosis, providing both functional and anatomical information. The results of the study, one of the first of its kind, are detailed in "Evaluation of 18F-FDG Uptake and Arterial Wall Calcifications Using 18F-FDG PET/CT." While the results are exciting, the two ...
... is a medical imaging technology that combines multiple X-ray images with the aid of a computer to generate slices or cross-sectional images of specific areas of the human body. The CT scan is a very detailed imaging procedure, and it often provides physicians with the most complete picture of whats happening inside a patients body. This makes it particularly useful and widely used in diagnosing cancer. Compared to other diagnostic tests, however, CT scans deliver a relatively high dose of radiation to the patient.. The technologist places the patient on a special motorized table that moves the patient through a circular opening in the CT imaging system while an x-ray source and detector within the housing rotate around the patient.. Often, a radio-opaque chemical substance, called a contrast agent, is given to the patient - by mouth, injected into a vein, given by enema, or given in all three ways - before the CT scan is done. The contrast agent is used to highlight ...
Since 2004, the Prevent Cancer Foundation has hosted a series of annual workshops focused on the application of high resolution CT imaging data to lung cancer drug development. This unique forum brings together key leaders in lung cancer early detection and development of new therapies for management of early-stage disease:
An 88-year-old woman presented to our clinic with a long-term history of cough, dyspnea, and fatigue. She had no history of smoking or biomass exposure. Her medical history revealed that she was treated with an antibiotic for three months eight years ago, but she did not recall the name of the drug or the indication. The results of routine blood testing and physical examination were unremarkable however, renal function test results were poor. The C-reactive protein level was 23 mg/L. Cardiac enzymes were at normal levels. Chest X-ray revealed a right hilar lobulated mass. Intravenous contrast could not be infused due to high creatinine levels. Non-contrast-enhanced multidetector computed tomography (MDCT) of the chest showed a well-delineated, nodular, hypodense mass with fluid attenuation in the right pulmonary artery (Figure 1) and multiple millimetric, hypodense lesions filling the upper lobe branches and surrounding the parenchyma (Figure 2, 3). The right ventricle volume and main pulmonary ...
An 88-year-old woman presented to our clinic with a long-term history of cough, dyspnea, and fatigue. She had no history of smoking or biomass exposure. Her medical history revealed that she was treated with an antibiotic for three months eight years ago, but she did not recall the name of the drug or the indication. The results of routine blood testing and physical examination were unremarkable however, renal function test results were poor. The C-reactive protein level was 23 mg/L. Cardiac enzymes were at normal levels. Chest X-ray revealed a right hilar lobulated mass. Intravenous contrast could not be infused due to high creatinine levels. Non-contrast-enhanced multidetector computed tomography (MDCT) of the chest showed a well-delineated, nodular, hypodense mass with fluid attenuation in the right pulmonary artery (Figure 1) and multiple millimetric, hypodense lesions filling the upper lobe branches and surrounding the parenchyma (Figure 2, 3). The right ventricle volume and main pulmonary ...
These specialized tests use the CT scanner to take pictures of the brain as a contrast dye is injected into your bloodstream. The dye helps to produce a more detailed image of the blood vessels in the brain.. CT angiography is a less invasive alternative to conventional angiography because the dye is injected through a needle into a vein in your arm or hand. Conventional angiography requires a long, thin tube called a catheter be inserted through an incision in your groin or arm and guided through your arteries to the head.. CT angiography is more accurate than normal CT at determining where the blockage is, how much brain tissue is permanently damaged, and how well smaller vessels are routing blood flow around the blockage.2. A perfusion CT scan uses the dye to produce a map of all the blood in your brain. This can help doctors identify the location of reduced blood flow that is responsible for stroke symptoms. Certain types of perfusion CT can also measure how quickly your blood is moving in ...
CT systems use a series of X-ray imagbes to create an image volume datasetthatcan slices or 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 souce CT), and interative reconstruction dose reduction software.
CT systems use a series of X-ray imagbes to create an image volume datasetthatcan slices or 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 souce CT), and interative reconstruction dose reduction software.
When your pet requires a CT scan, they will need to be sedated them using anesthesia. It is administered by a trained technician and overseen by a veterinarian. The sedation is to help your pet remain calm and still throughout the procedure, as any slight movement will corrupt the quality of the images. At Maxvets, CT scans are overseen by our board-certified veterinary radiologists, and Dr. Sudhir Singh.. Your pets are moved inside the scanner once they are calm and relaxed under sedation. It looks as in the picture. We have a multi-slice GE Computer tomography machine. Sometimes a contrast dye may be used intravenously to accentuate soft tissues and blood vessels.. The process begins with the X-rays inside the scanner starts spinning and capturing the images used to build an internal picture. These X-ray images are sent to the computer and after complex image processing inside it are displayed on the monitor. The resulting image resembles as actual organ. This process is mostly in real ...
1In clinical practice, the use of SAFIRE may reduce CT patient dose depending on the clinical task, patient size, anatomical location, and clinical practice. A consultation with a radiologist and a physicist should be made to determine the appropriate dose to obtain diagnostic image quality for the particular clinical task. The following test method was used to determine a 54 to 60% dose reduction when using the SAFIRE reconstruction software. Noise, CT numbers, homogenity, low-contast resolution and high contrast resolution were assessed in a Gammex 438 phantom. Low dose data reconstructed with SAFIRE showed the same image quality compared to full dose data based on this test. Data on file. ...
1In clinical practice, the use of SAFIRE may reduce CT patient dose depending on the clinical task, patient size, anatomical location, and clinical practice. A consultation with a radiologist and a physicist should be made to determine the appropriate dose to obtain diagnostic image quality for the particular clinical task. The following test method was used to determine a 54 to 60% dose reduction when using the SAFIRE reconstruction software. Noise, CT numbers, homogenity, low-contast resolution and high contrast resolution were assessed in a Gammex 438 phantom. Low dose data reconstructed with SAFIRE showed the same image quality compared to full dose data based on this test. Data on file. ...
The X500-CT is a five-axis universal Computed Tomography (CT) system designed for the inspection of medium size objects. The moderate scan envelope of the 500 Series makes it ideally suited for multiple small objects and larger objects up to 24" in size.. ...
Computerized tomography (CT) combines a series of X-ray views taken from multiple different angles to produce cross sectional images of the body. The Multislice CT scanner allows faster capture of images than traditional scanners, so that motion artifact is minimized. This results in clearer, more accurate images. Children and elderly patients who often need to be sedated in standard scanners can often complete their studies at MCAI without the need for costly and potentially complicated anesthesia ...
CT scans are much more detailed than regular X-Rays and can identify many conditions that can escape detection on other imaging tests.
I am looking for computer tomography SW. I would greatly appreciate if someone could give me any relevant information e.g. a phone number or a person to contact with from a company or research group. Thank you! George Kossioris, CMU ...
Learn more about PET/CT Scan at Reston Hospital Center DefinitionReasons for TestPossible ComplicationsWhat to ExpectCall Your Doctorrevision ...
Rapid sequence CT imaging provides information about the vascular anatomy (CT angiography), locates major vessels encased by tumor, and eliminates the possibility of avascular lesions in the differential diagnosis of a head and neck tumor. Furthermore the use of density-time curves allows arterial and venous time. The patterns of density-time curves are characteristic for various lesions. For glomus complex tumors, regardless of the size and location, dynamic CT easily differentiates them from most of the simulating lesions. Angiography therefore is occasionally necessary for verification. Dynamic CT has a risk of complications the same as that of any intravenous injection of contrast material. Cerebral angiography via the femoral approach has been reported to have a risk of major complications of 0.28% and of minor complications of 6.25%.
Computed tomography, also commonly referred to as a CAT scan, is a medical imaging method that provides detailed 3-D images of areas inside the body. CT uses a thin beam of x-rays to take a series of cross-sectional pictures of specific organs or areas inside the body from multiple different angles. The CTs computer then analyzes the pictures and constructs a three dimensional image of the area of interest. During some CT scans, a contrast medium, or "dye", is used to outline blood vessels or highlight organs of the body so that they can be seen more easily.. CT images of internal organs, bones, soft tissue and blood vessels typically provide greater detail than traditional x-rays, particularly of soft tissues and blood vessels.. Using specialized equipment and expertise to create and interpret CT scans of the body, radiologists can more easily diagnose problems such as cancer, cardiovascular disease, infectious disease, appendicitis, trauma and musculoskeletal disorders.. ...
... (CT) is a special x-ray technology in which a computer is used to create highly detailed cross sectional images of a portion of the body. In conventional radiography, the x-ray tube remains stationary as an image is generated. In CT, the x-ray tube rotates around the patient and generates axial slices (like the slices in a loaf of bread). CT is especially good in evaluating bone (fractures, infections, tumors) and vertebral lesions such as calcified disks. Neurological computed tomography scans can be used to diagnose fractures, deformities, disease or degenerative conditions. Good quality CT and/or MR imaging is required to completely identify a lesion and its interaction with surrounding tissue (see CT vs MRI). These "blue prints" are especially important prior to surgery to help provide the surgeon with an accurate picture of the problem. During a CT scan, general anesthesia is administered in order to keep patients still while skilled technicians monitor the patient ...
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). NSIs patent pending product is something never seen before and is considered the future of industrial 3D X-ray inspection.. 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. Because this is an X-ray Computed Tomography process, both the internal and external structures of an object are obtained. This new and exciting technology makes it possible to study form, structure and now - function.. 4D Computed Tomography inspection is revolutionary for in situ testing applications such as compression, traction and similar processes. This technology also opens the door for evaluating the effects that temperature or chemicals have on an object over a period of time. Additionally, studies in hydrodynamics, process and quality, ...
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I had a CT Scan done last week with found scattered nodules 3 mm to 6 mm in size with ground-glass opacities + moderate emphysema. Does this mean I have lung cancer? I am 56 years old and have only s...
Learn more about Electron-Beam Computed Tomography at Grand Strand Medical Center DefinitionReasons for TestPossible ComplicationsWhat to ExpectCall Your Doctorrevision ...
Learn more about Electron-Beam Computed Tomography at TriStar Centennial DefinitionReasons for TestPossible ComplicationsWhat to ExpectCall Your Doctorrevision ...
Best diet for 21 year old female - Im a 21 year old female, Im 114lbs. I would like to be 125lbs., and eat healthier. My diet now consists of nothing but pop and junk food. Pls help! Eat whole foods. Congrats! You're bound to develop serious health issues if you don't improve your diet. Totally stop pop- you might try kombucha as a healthy alternative. Snack on nuts. Have a salad every day. Emphasize veggies, beans, fruits and whole grains. Can also have chicken, eggs, cheese- preferably organic. Satisfy sweet cravings with fruit and dark chocolate. See http://tinyurl. Com/ktampgg for more info
Computed tomography (CT or CAT scan) 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 tissue. While much information can come from a standard X-ray, MRI captures much more detail about internal organs and other structures.. In a CT scan, an X-ray beam moves in a circle around the body. This provides 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) form on a monitor.. CT scans may be done with or without "contrast." Contrast refers to a substance taken by mouth or injected into an intravenous (IV) line that causes the ...
some people worry about getting this test because radiation is known as a possible cause of cancer. know that the chances of getting cancer from a ct scan are very low.
The Report France Computed Tomography (CT) Systems Market Outlook to 2022 provides information on pricing, market analysis, shares, forecast, and company profiles for key industry participants. - MarketResearchReports.biz
Cardiac imaging by multi-slice computed tomography (MSCT) is a recently developed technique for assessing the function of the heart and coronary arteries non-invasively.
HRCT; Thin-section CT scan High-resolution computed tomography (HRCT) chest scan is a powerful diagnostic tool for the evaluation of lung parenchyma. It can identify a wide array of findings that...
You may want to ask your healthcare provider about the amount of radiation used during a CT scan and the risks tied to your particular situation. Radiation from CT scans varies. But it may be up to 100 times greater than a normal chest X-ray. It is a good idea to keep a record of your radiation exposure, such as previous CT scans and other types of X-rays, so that you can inform your healthcare provider. Risks linked to radiation exposure may be related to the total number of X-ray exams and treatments over a long period.. If you are pregnant or think that you may be, tell your healthcare provider. Radiation exposure during pregnancy may lead to birth defects. If its necessary for you to have a CT scan of the bones, special precautions will be taken to reduce the radiation exposure to the fetus.. Nursing mothers should talk with their provider about whether to delay breastfeeding after receiving contrast. There are conflicting recommendations on this topic.. If contrast dye is used, there is a ...
We are investigating the role that texture features can play in characterizing the trabecular bone micro-architecture of the proximal femur or tibia, and spinal vertebrae, as visualized through multi-detector CT (MDCT) or MRI. We are particularly interested in using such texture features, indicative of local topology or geometry of underlying bone tissue structures, as quantitative measures for predicting bone strength.. Learn more about Characterization of Trabecular Bone Micro-architecture for Bone Strength Estimation. ...
Plain film x-ray is the most common diagnostic radiological modality used in hospitals today. The radiation is created when an electric current is generated from a high voltage generator causing electrons to
Chesapeake Regional offers a 256-slice CT. Compared to conventional CT scanners, our state-of-the-art 256-slice CT scanners offer improved image quality and speed.
CT Scan Protocols, CT Protocols by Manufacturer- GE, Siemens, Phillips, Toshiba. Slice Counts- Dual Source, 320 slice, 256 slice, 128 slice, 64 slice, 16 slice, 4 slice, single detector.
ECG-gated computed tomography (CT) enables motion analysis of implanted stent grafts. In 2011, Klein et al. developed algorithms to estimate stent graft motion by means of segmentation and image registration. In this project, Kleins method is further developed, validated and applied to clinical data in order to investigate the dynamic behavior of stent grafts and their interaction with aortic wall during the cardiac cycle and over time. In collaboration with the Medisch Spectrum Twente hospital, the LSPEAS trial is conducted. Patients included is the trial receive ECG-gated CT scans at standardized time points during follow-up. Figure 4 provides an example of motion estimation of the proximal dual ring of the Anaconda™ stent graft. In March 2017, the LSPEAS F-EVAR national multicenter trial was launched. Patients with complex abdominal aneurysms who undergo fenestrated EVAR (Figure 3) are included. Motion and configurational changes of stented branch vessels are investigated. ...
Binary tomography -- the process of identifying faulty network links through coordinated end-to-end probes -- is a promising method for detecting failures that the network does not automatically mask (e.g., network "blackholes"). Because tomography is sensitive to the quality of the input, however, naive end-to-end measurements can introduce inaccuracies. This paper develops two methods for generating inputs to binary tomography algorithms that improve their inference speed and accuracy. Failure confirmation is a per-path probing technique to distinguish packet losses caused by congestion from persistent link or node failures. Aggregation strategies combine path measurements from unsynchronized monitors into a set of consistent observations. When used in conjunction with existing binary tomography algorithms, our methods identify all failures that are longer than two measurement cycles, while inducing relatively few false alarms. In two wide-area networks, our techniques decrease the number of ...
In the majority of cases, IAD is recognised and treated during PCI by positioning a coronary stent to seal the intimal tear. Patients experience variable degrees of chest/back pain and hypotension. Emergency CT-angiography within a few hours is required for diagnostic confirmation and staging. Similarly to spontaneous aortic syndromes, when available ECG-gated multidetector CT techniques greatly improve assessment of acute aortic abnormalities by eliminating the pulsation artifacts in the ascending aorta. As in this case, in IAD very high attenuation corresponding to CM injected during PCI is seen accumulating in the false lumen, which typically appears non-circulating, provided that the entry defect is occluded spontaneously or by stent placement. Conversely, an enhancing false lumen indicates the presence of an ongoing communication with the true aortic lumen. According to Dunning et al., IAD is graded as class I (limited to the ipsilateral aortic cusp), II (extending ≤4 cm up the aorta) and ...
10.1055/b-0039-168054 Part 1 Hepatobiliary Case 1Rocky C. Saenz Fig. 1.1 Unenhanced axial CT image (a) demonstrates a hypodense mass within the left lobe. The mass demonstrates peripheral nodular enhancement on arterial phase imaging with a central hypodense scar (b). On venous phase imaging (c), the mass is hyperdense to surrounding hepatic parenchyma. On delayed imaging…
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
BackgroundOsteosarcoma is the most common pediatric malignant bone tumor, frequently surgically managed with limb salvage rather than amputation. Local recurrences are seen in up to 9% of osteosarcoma patients, with CT and MRI imaging often limited by metal artifacts.ObjectiveTo describe the [F-18]2-fluoro-2-deoxyglucose (FDG) PET/CT appearance of local osteosarcoma recurrences with correlation to findings on other imaging modalities.Materials and methodsA retrospective review of pediatric osteosarcoma patients imaged with FDG PET/CT was performed in patients with pathologically proven local recurrences. FDG PET/CT findings were reviewed and correlated with available comparison imaging studies.ResultsTen local osteosarcoma recurrences in eight pediatric osteosarcoma patients were imaged with FDG PET/CT. All eight patients had a local recurrence after limb salvage; two patients had a second local recurrence after amputation. All local recurrences were seen with FDG PET/CT, demonstrating solid (n=5) or
Looking for online definition of positron emission tomography scanner in the Medical Dictionary? positron emission tomography scanner explanation free. What is positron emission tomography scanner? Meaning of positron emission tomography scanner medical term. What does positron emission tomography scanner mean?
The efficacy of preoperative positron emission tomography-computed tomography (PET-CT) for detection of lymph node metastasis in cervical and endometrial cancer : clinical and pathological factors influencing it(審査報告)The efficacy of preoperative positron emission tomography-computed tomography (PET-CT) for detection of lymph node metastasis in cervical and endometrial cancer : clinical and pathological factors influencing it(審査報告) ...
Subdural hematomas, whose absorption values approximate those of adjacent brain, are not visualized in routine computed tomography. While unilateral chronic isodense subdural hematomas as a result of indirect signs of a space-occupying lesion are easily recognizable on computed tomography (CT) and clearly diagnosed on the angiogram, bilateral chronic isodense subdural hematomas may cause considerable difficulty. see Bilateral isodense chronic subdural hematoma Two clues indicating the presence of such "isodense" subdural hematomas are: (1) unilateral effacement of cerebral sulci on the convexities, and (2) midline shift or mass effect on the ventricles in the absence of abnormal areas of diminished or increased density in the brain. Nine cases were detected on pre- and postcontrast studies in 2,500 CT scans of the brain over a 10 month period. Delayed CT scanning 4-6 hr after intravenous contrast injection showed enhancement of the subdural hematoma in three of seven cases 1). The time that a ...
To identify patients with spontaneous subarachnoid hemorrhage for whom CT angiography alone can exclude ruptured aneurysms. An observational retrospective review was carried out of all consecutive patients with non-traumatic subarachnoid hemorrhage who underwent both CT angiography and catheter angiography to exclude an aneurysm. CT angiography negative cases (no aneurysm) were classified according to their CT hemorrhage pattern as aneurismal, perimesencephalic or as no-hemorrhage. Two hundred and forty-one patients were included. A CT angiography aneurysm detection sensitivity and specificity of 96.4% and 96.0% were observed. All 35 cases of perimesencephalic or no-hemorrhage out of 78 CT angiography negatives also had negative angiography findings. CT angiography is self-reliant to exclude ruptured aneurysms when either a perimesencephalic hemorrhage or no-hemorrhage pattern is identified on the CT within a week of symptom onset.
Abstract: Bronchogenic cysts are rare congenital lesions of the bronchial tree which are mostly asymptomatic. Rarely when the size is large it can compress on the adjacent structures in the mediastinum. We report a rare case of 10 month old baby presented with recurrent lower respiratory tract infection, was suspected to have a pericardial cyst on echocardiography. On further imaging it was confirmed to be a large bronchogenic cyst from the carina compressing on the left atrium and the left bronchus causing congenital lobar emphysema of the left lung. In view of compression of the adjacent structures patient was sent for surgery. Though congenital bronchogenic cysts involving pericardium and intracardiac tissues have been reported but mediastinal bronchogenic cysts compressing on left bronchus causing congenital lobar emphysema have rarely been reported. Key words: Bronchogenic cyst, Congenital lobar emphysema.. ...
OBJECTIVE: To compare radiation doses delivered at prospectively ECG-triggered sequential- (SEQ), retrospectively ECG-gated spiral- (RETRO) and prospectively ECG-triggered high-pitch spiral- (HP) computed tomography coronary angiography (CTCA) protocols, as well as catheter coronary angiography (CCA) using an anthropomorphic phantom. MATERIALS AND METHODS: An anthropomorphic Alderson phantom equipped with 50 thermoluminescent dosimeters (TLDs) was scanned using different CTCA protocols and an uncomplicated diagnostic CCA examination was simulated. Absorbed doses were experimentally determined and effective doses calculated using the dose-length product (DLP) for CTCA and the dose-area product (DAP) for CCA, as well as according to International Commission on Radiation Protection (ICRP) publications 60 and 103. RESULTS: Effective organ doses were significantly lower for HP protocols (100kV: 0.17±0.26mSv; 120kV: 0.26±0.39mSv) compared to SEQ protocols (100kV: 0.50±0.79mSv; 120kV: 0.90±1.41mSv; ...
TY - JOUR. T1 - Liver abscess after percutaneous radiofrequency ablation for hepatocellular carcinomas. T2 - Frequency and risk factors. AU - Choi, Dongil. AU - Lim, Hyo K.. AU - Kim, Min Ju. AU - Kim, Suk Jung. AU - Kim, Seung Hoon. AU - Lee, Won Jae. AU - Lim, Jae Hoon. AU - Paik, Seung Woon. AU - Yoo, Byung Chul. AU - Choi, Moon Seok. AU - Kim, Seonwoo. PY - 2005/1/1. Y1 - 2005/1/1. N2 - OBJECTIVE. The purpose of this study was to clarify the frequency and risk factors of liver abscess formation after percutaneous radiofrequency ablation in patients with hepatocellular carcinoma. MATERIALS AND METHODS. Over a 4-year period, 603 patients with 831 hepatocellular carcinomas measuring 5 cm or less in maximum diameter who underwent a total of 751 percutaneous radiofrequency ablation procedures were enrolled in this study. We retrospectively reviewed the medical records and analyzed the overall frequency of liver abscess, risk factors for abscess, and clinical features of the patients. The ...
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 ...
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 ...
"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 ...
CR = Computed Radiography. *CS = Cystoscopy. *CT = Computed Tomography. *DD = Duplex Doppler. *DF = Digital Fluoroscopy ( ... X-Ray Angiographic Bi-Plane Image Storage 1.2.840.10008.5.1.4.1.1.12.3 ...
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 ...
Cysts are detected with ultrasound, X-ray computed tomography, or other imaging techniques. Antiechinococcus antibodies can be ...
X-ray Computed Tomography. Phys Med Biol 2006; 51: R29-R43 Kalender WA, Kyriakou Y. Flat-detector computed tomography (FD-CT). ... Dose in x-ray computed tomography. Phys Med Biol 2014; 59 R129-R150 Kalender WA, Kolditz D, Steiding C, Ruth V, Lück F, Rößler ... Eur Radiol 2016; DOI 10.1007/s00330-016-4459-3 And a well-received text book on CT; Computed tomography. Fundamentals, System ... The development and introduction of volumetric spiral computed tomography was a particular focus of his work. The combination ...
... , 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] ...
... was used as a radio contrast agent for X-ray computed tomography imaging studies. Its use was discontinued due ... doi:10.1002/047084289X.rl121.pub2 Lusic, Hrvoje; Grinstaff, Mark W. (2013). "X-ray-Computed Tomography Contrast Agents". ...
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 ...
Cormack is best known for his work on X-ray computed tomography (CT). He won the Nobel Prize in Physiology or Medicine in 1979 ... Even though he was mostly working on particle physics, he had a side interest in x-ray technology which led him to develop the ...
... computed tomography, fluoroscopy, magnetic resonance, mammography, molecular imaging ultrasound, and x-ray equipment; and ... Schenectady, USA, energy industry software and training),[71] CTI Molecular Imaging (Positron emission tomography and molecular ...
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 ...
Computed tomography scan (CT or CAT scan): A diagnostic image created after a computer reads x-rays. It can show the shape and ... X-ray: Although traditional plain X-rays are limited in their ability to image soft tissues such as discs, muscles, and nerves ... Myelogram: An x-ray of the spinal canal following injection of a contrast material into the surrounding cerebrospinal fluid ... X-ray can still play a relatively inexpensive role in confirming the suspicion of the presence of a herniated disc. If a ...
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 ... Golden R (1925). "The effect of bronchostenosis upon the roentgen ray shadow in carcinoma of the bronchus". Am J Roentgenol. 13 ... "Computed tomography appearance of Golden's "S" sign". J Comput Tomogr. 8 (3): 219-23. doi:10.1016/0149-936X(84)90065-1. PMID ...
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 ...
... is X-ray computed tomography (CT) using radiocontrast. Radiocontrasts for X-ray CT are, in general, iodine-based. ... Selected Topics on Computed Tomography. ISBN 9789535111023. License: CC-BY-3.0. Chapter 1: "Computed Tomography in Abdominal ... Computed tomography of the abdomen and pelvis#Contrast administration Webb, W. Richard; Brant, Wiliam E.; Major, Nancy M. (2014 ... Bolus tracking is a technique used in computed tomography imaging, to visualise vessels more clearly. A small bolus of radio- ...
X-ray-Computed Tomography Contrast Agents, Chem. Rev. 2013, 113 pp. 1641-1666. ...
Model-based image reconstruction in X-ray computed tomography (PhD thesis). Utrecht University. Zbijewski, W.; Beekman, F.J. ( ... Zbijewski research is focused on Computed tomography system optimization, algorithm development, and clinical applications, ... Cone beam computed tomography (CBCT), image reconstruction in CT, and applications of CT and CBCT in orthopedics. He is faculty ... Zbijewski is an American biomedical engineering and medical physics working in the fields of Computed tomography (CT), ...
These cysts are visible in CT scans (X-ray computed tomography). However, many pancreatic cysts are benign (see Pancreatic ... These include computerized tomography (CT), endoscopic ultrasound (EUS), and magnetic resonance cholangiopancreatography (MRCP ...
Chest X-rays and X-ray computed tomography (CT) can reveal areas of opacity (seen as white), indicating consolidation. CAP does ... Additional tests include X-ray computed tomography, bronchoscopy or lung biopsy. Major complications of CAP include: Sepsis, ... Syrjälä H, Broas M, Suramo I, Ojala A, Lähde S (August 1998). "High-resolution computed tomography for the diagnosis of ... Abscess: A pocket of fluid and bacteria may be seen on an X-ray as a cavity in the lung. Abscesses, typical of aspiration ...
Diagnosis can be made using chest X-ray; the lesion shows up as a small, round area filled with air. Computed tomography can ...
... microscopy Phase-contrast X-ray imaging Quantitative phase contrast microscopy Refractive index X-ray computed tomography ... "Phase-contrast X-ray computed tomography for observing biological soft tissues". Nature Medicine. 2 (4): 473-475. doi:10.1038/ ... In X-ray tomography, the same physical principles can be used to increase image contrast by highlighting small details of ... Synchrotron X-ray tomography can employ phase contrast imaging to enable imaging of the interior surfaces of objects. In this ...
Influence of x-ray Compton scattering in cone beam computed tomography (CBCT). Image registration methods for minimally ... Cone beam computed tomography (CBCT) systems for image-guided radiation therapy (IGRT). Cone beam computed tomography (CBCT) ... Cone beam computed tomography (CBCT) systems on mobile C-arms for image-guided surgery. Cone beam computed tomography (CBCT) ... cone beam computed tomography (CBCT), and computed tomography (CT) systems; image-guided surgery; multi-modality medical image ...
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) ...
With computed axial tomography, computers construct cross-sections from x-ray data. A 3-D view of a beverage-can stove with a ... To render each such picture, a ray of sight (also called a projection line, projection ray or line of sight) towards the object ... Third-angle projection: The points of interest are projected in the opposite direction of the ray of sight; the points are ... as determined by the ray of sight; the plane of projection acts like the top of a table over which the points of interest are ...
... 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 ...
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 © dkfz.de ... 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 ...
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 ... www.intechopen.com/embed/computed-tomography-special-applications/gamma-ray-computed-tomography-in-soil-science-some- ... www.intechopen.com/embed/computed-tomography-special-applications/gamma-ray-computed-tomography-in-soil-science-some- ...
... 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 ...
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 ...
... 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 ( ...
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 ...
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 ...
Quantitative computed tomography of the lumbar spine, not dual x-ray absorptiometry, is an independent predictor of prevalent ... Clinical Use of Quantitative Computed Tomography and Peripheral Quantitative Computed Tomography in the Management of ... Correlations of dual-energy x-ray absorptiometry, quantitative computed tomography, and single photon absorptiometry with ... BMD = bone mineral density; DXA = dual x-ray absorptiometry; QCT = quantitative computed tomography. ...
... we will see demonstrations of micro-computed tomography, X-ray ... ... In this module, we will see demonstrations of micro-computed tomography, X-ray photoelectron spectroscopy, and optical ... Micro Computed Tomography: Measurement Demonstration. To view this video please enable JavaScript, and consider upgrading to a ... X-ray projections for a honeybees scanned in the Micro CT. A computer then ...
Key Words: µ-Focus Computed Tomography, µCT, Fast Scanning, Quality Assurance, Production, High-Power-Target ... Current µ-focus X-Ray systems offer high resolution and advanced detail detectability. However, current CT systems suffer from ... Computed tomography (CT) is the preferred way for 3-dimensional analysis of state-of-the-art semiconductor packaging solutions ... THE CT REVOLUTION: HIGH-SPEED µ-FOCUS X-RAY COMPUTED TOMOGRAPHY FOR SEMICONDUCTOR AND SMT APPLICATIONS. Authors: Dr. Jens Peter ...
... Dataset homepage ... imaged in Eocene Paris amber using X-Ray Computed Tomography. Zootaxa 1623: 47-53, DOI: 10.5281/zenodo.179249 Taxonomic ... imaged in Eocene Paris amber using X-Ray Computed Tomography. Plazi.org taxonomic treatments database. Checklist dataset https ...
  • 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. (sintef.no)
  • Measuring root traits in barley (Hordeum vulgare ssp vulgare and ssp spontaneum) seedlings using gel chambers, soil sacs and X‐ray microtomography. (currentprotocols.com)
  • The aim of the paper was to present an overview on the applicability and relevance of X-ray microtomography in the study of mineralised tissues of the teeth. (viamedica.pl)
  • X-ray microtomography offers within the analysis of mineralised tissues - complex structures of bone, teeth and biomedical materials, turn out to be indispensable since it opens new opportunities for cognitive and implementation research. (viamedica.pl)
  • X-ray microtomography study to validate the efficacies of caries removal in primary molars by hand excavation and chemo-mechanical technique. (viamedica.pl)
  • A comparison of the mineral content of enamel and dentine in human premolars and enamel pearls measured by X-ray microtomography. (viamedica.pl)
  • Here we demonstrate that, even in the absence of X-ray contrast agents, X-ray computed microtomography (microCT) and nanotomography (nanoCT) can circumvent these problems by rapidly resolving compositionally discrete 3D tissue regions (such as the collagen-rich adventitia and elastin-rich lamellae in intact rat arteries) which in turn can be segmented due to their different X-ray opacities and morphologies. (salford.ac.uk)
  • 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. (qualitymag.com)
  • 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. (wiley.com)
  • 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 ). (wiley.com)
  • 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. (spiedigitallibrary.org)
  • Comparison of the cross-section averaged solids concentrations obtained by X-ray computed tomography with those inferred from differential pressure measurements confirms the high accuracy of the applied method. (fraunhofer.de)
  • Such a system is used used for measurements on small objects and in micro-fluidic applications (crystallisation processes, capillary flows, micro structure tomography). (hzdr.de)
  • 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. (superlectures.com)
  • 4D Computed Tomography inspection is revolutionary for in situ testing applications such as compression, traction and similar processes. (ndt.net)
  • 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. (scielo.org.za)
  • Additionally, X-ray CT allows visualisation of plant roots in situ without the need for traditional invasive methods such as root washing. (nottingham.ac.uk)
  • 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. (dkfz.de)
  • 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. (qualitymag.com)
  • 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. (hzdr.de)
  • In the frame of research in thermal fluid dynamics we use X-ray radiography and tomography techniques for the measurement of gas and liquid hold-up in chemical vessels and experimental flow loops. (hzdr.de)
  • 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. (hud.ac.uk)
  • 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 ). (wiley.com)
  • 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. (rigaku.com)
  • Gamma-ray computed tomography to evaluate changes in the structure of a clayey soil due to agricultural traffic. (thefreelibrary.com)
  • A simple method to evaluate the X-ray-exposure-to-accuracy performance of the CT system was developed and applied. (avhandlingar.se)
  • This paper aims to evaluate microfocus X-ray computed tomography (μCT) as a technique that can link petrography and petrophysics. (lyellcollection.org)
  • This mapping allows anatomical information to be incorporated into bioluminescence tomography (BLT) reconstruction procedures and, when applied using sources visible to both optical and anatomical modalities, can be used to evaluate the accuracy of those reconstructions. (edu.au)
  • Microfocus X-ray computed tomography (CT) scanning is a three-dimensional (3D) non-destructive technique that is useful in many research and technology fields. (journals.co.za)
  • The analysis was based on the X-ray Computed Tomography (X-ray CT) scanning tests and subsequent image analyses. (scielo.org.za)
  • 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. (scielo.org.za)
  • Spiral scanning is induced into synchrotron X-ray micro-CT (SR -CT) to resolve this problem. (iphy.ac.cn)
  • NSI s patent pending product is something never seen before and is considered the future of industrial 3D X-ray inspection. (ndt.net)
  • It is important to find cracks, open solder joints or voids via X-ray inspection. (accelonix.nl)
  • 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. (accelonix.nl)
  • 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. (accelonix.nl)
  • 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. (accelonix.nl)
  • X-ray electronics inspection systems respond to a growing demand for flexible, detailed and affordable inspection to cope with the demands of ever-smaller electrical components and comply with tighter quality standards. (atlantechusa.com)
  • Objectives: Primary: to investigate the precision and reliability of a knee bone mineral density (BMD) assessment protocol that uses an existing dual energy X-ray absorptiometry (DXA) forearm acquisition algorithm in individuals with spinal cord injury (SCI). (northwestern.edu)
  • 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. (iospress.com)
  • The procedures we propose make possible the mapping of two-dimensional (2-D) bioluminescence image (BLI) data onto a skin surface derived from a three-dimensional (3-D) anatomical modality [magnetic resonance (MR) or computed tomography (CT)] dataset. (edu.au)
  • Correlative analysis of the same specimens was performed by in vivo and ex vivo helical computed tomography (HCT) and ex vivo μCT. (sintef.no)
  • 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. (springer.com)
  • The Vision Lab , an fun and exciting research group at the University of Antwerp, has an open position for a PhD student to work on developing innovative image reconstruction methods for X-ray Computed Tomography (CT). (sciencecareers.org)
  • Iterative reconstruction methods in X-ray CT. (wikipedia.org)
  • 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. (springer.com)
  • In a well-calibrated system using a monochromatic X-ray source (i.e. synchrotron or gamma-ray emitter) this equation can be solved directly. (carleton.edu)
  • 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. (thefreelibrary.com)
  • 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. (journals.co.za)
  • 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. (wikipedia.org)
  • Current µ-focus X-Ray systems offer high resolution and advanced detail detectability. (smta.org)
  • 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. (ndt.net)
  • 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. (rsc.org)
  • 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. (smta.org)
  • 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. (accelonix.nl)
  • Recovering complete plant root system architectures from soil via X‐ray mu‐Computed Tomography. (currentprotocols.com)
  • In the present study, it was hypothesized that there are computed tomography (CT) characteristics that can identify which of these children are most likely to need operative intervention. (isharonline.org)
  • 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. (nottingham.ac.uk)
  • Thanks to the rapid development of both the X-ray tubes as the detectors, we can image objects with continuously better resolution. (ugent.be)
  • 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. (scielo.org.za)
  • 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. (scielo.org.za)
  • This can either be used to increase the image quality at the same X-ray exposure level, or to lower the patient X-ray dose whilst maintaining the same image quality. (wikipedia.org)
  • X-ray tomography enables a non-invasive superposition-free visualisation of the density distribution in an object. (hzdr.de)
  • Finally we apply microCT to another human organ (skin) to visualise the cell-rich epidermis and extracellular matrix-rich dermis and to show that conventional histological and immunohistochemical staining protocols are compatible with prior X-ray exposure. (salford.ac.uk)