Computed tomography modalities which use a cone or pyramid-shaped beam of radiation.
Tomography using x-ray transmission and a computer algorithm to reconstruct the image.
Photosensitive afferent neurons located primarily within the FOVEA CENTRALIS of the MACULA LUTEA. There are three major types of cone cells (red, blue, and green) whose photopigments have different spectral sensitivity curves. Retinal cone cells operate in daylight vision (at photopic intensities) providing color recognition and central visual acuity.
Radiographic techniques used in dentistry.
Bulbous enlargement of the growing tip of nerve axons and dendrites. They are crucial to neuronal development because of their pathfinding ability and their role in synaptogenesis.
Imaging methods that result in sharp images of objects located on a chosen plane and blurred images located above or below the plane.
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.
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.
A rapid, low-dose, digital imaging system using a small intraoral sensor instead of radiographic film, an intensifying screen, and a charge-coupled device. It presents the possibility of reduced patient exposure and minimal distortion, although resolution and latitude are inferior to standard dental radiography. A receiver is placed in the mouth, routing signals to a computer which images the signals on a screen or in print. It includes digitizing from x-ray film or any other detector. (From MEDLINE abstracts; personal communication from Dr. Charles Berthold, NIDR)
The largest and strongest bone of the FACE constituting the lower jaw. It supports the lower teeth.
The use of a device composed of thermoluminescent material for measuring exposure to IONIZING RADIATION. The thermoluminescent material emits light when heated. The amount of light emitted is proportional to the amount of ionizing radiation to which the material has been exposed.
Materials used as reference points for imaging studies.
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.
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.
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)
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.
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).
Photosensitive proteins expressed in the CONE PHOTORECEPTOR CELLS. They are the protein components of cone photopigments. Cone opsins are classified by their peak absorption wavelengths.
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.
The posterior process on the ramus of the mandible composed of two parts: a superior part, the articular portion, and an inferior part, the condylar neck.
An articulation between the condyle of the mandible and the articular tubercle of the temporal bone.
Computer systems or networks designed to provide radiographic interpretive information.
Tomography using radioactive emissions from injected RADIONUCLIDES and computer ALGORITHMS to reconstruct an image.
The total absence of teeth from either the mandible or the maxilla, but not both. Total absence of teeth from both is MOUTH, EDENTULOUS. Partial absence of teeth in either is JAW, EDENTULOUS, PARTIALLY.
Types of spiral computed tomography technology in which multiple slices of data are acquired simultaneously improving the resolution over single slice acquisition technology.
The closeness of a determined value of a physical dimension to the actual value.
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.
The part of a tooth from the neck to the apex, embedded in the alveolar process and covered with cementum. A root may be single or divided into several branches, usually identified by their relative position, e.g., lingual root or buccal root. Single-rooted teeth include mandibular first and second premolars and the maxillary second premolar teeth. The maxillary first premolar has two roots in most cases. Maxillary molars have three roots. (Jablonski, Dictionary of Dentistry, 1992, p690)
Extraoral body-section radiography depicting an entire maxilla, or both maxilla and mandible, on a single film.
Three-dimensional computed tomographic imaging with the added dimension of time, to follow motion during imaging.
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.
Diseases of the PERIAPICAL TISSUE surrounding the root of the tooth, which is distinguished from DENTAL PULP DISEASES inside the TOOTH ROOT.
The thickest and spongiest part of the maxilla and mandible hollowed out into deep cavities for the teeth.
Screens which absorb the energy in the x-ray beam that has penetrated the patient and convert this energy into a light pattern which has as nearly as possible the same information as the original x-ray beam. The more light a screen produces for a given input of x-radiation, the less x-ray exposure and thus shorter exposure time are needed to expose the film. In most film-screen systems, the film is sandwiched between two screens in a cassette so that the emulsion on each side is exposed to the light from its contiguous screen.
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)
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.
Computer-assisted mathematical calculations of beam angles, intensities of radiation, and duration of irradiation in radiotherapy.
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.
A tooth that is prevented from erupting by a physical barrier, usually other teeth. Impaction may also result from orientation of the tooth in an other than vertical position in the periodontal structures.
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.
The third tooth to the left and to the right of the midline of either jaw, situated between the second INCISOR and the premolar teeth (BICUSPID). (Jablonski, Dictionary of Dentistry, 1992, p817)
The measurement of the dimensions of the HEAD.
A tomographic technique for obtaining 3-dimensional images with transmission electron microscopy.
Break or rupture of a tooth or tooth root.
Either of a pair of compound bones forming the lateral (left and right) surfaces and base of the skull which contains the organs of hearing. It is a large bone formed by the fusion of parts: the squamous (the flattened anterior-superior part), the tympanic (the curved anterior-inferior part), the mastoid (the irregular posterior portion), and the petrous (the part at the base of the skull).
A film base coated with an emulsion designed for use with x-rays.
Methods of creating machines and devices.
X-RAY COMPUTERIZED TOMOGRAPHY with resolution in the micrometer range.
A dead body, usually a human body.
The ratio of radiation dosages required to produce identical change based on a formula comparing other types of radiation with that of gamma or roentgen rays.
The air space located in the body of the MAXILLARY BONE near each cheek. Each maxillary sinus communicates with the middle passage (meatus) of the NASAL CAVITY on the same side.
Moving a patient into a specific position or POSTURE to facilitate examination, surgery, or for therapeutic purposes.
Use of optic and geometric techniques to enhance radiographic image quality and interpretation. It includes use of microfocal X-ray tubes and intensifying fluoroscopic screens.
Reference points located by visual inspection, palpation, or computer assistance, that are useful in localizing structures on or within the human body.
One of a pair of irregularly shaped bones that form the upper jaw. A maxillary bone provides tooth sockets for the superior teeth, forms part of the ORBIT, and contains the MAXILLARY SINUS.
Technique involving the passage of X-rays through oral structures to create a film record while a central tab or wing of dental X-ray film is being held between upper and lower teeth.
The inferior region of the skull consisting of an internal (cerebral), and an external (basilar) surface.
A normal developing tooth which has not yet perforated the oral mucosa or one that fails to erupt in the normal sequence or time interval expected for the type of tooth in a given gender, age, or population group.
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).
Tomography using x-ray transmission.
A dental specialty concerned with the prevention and correction of dental and oral anomalies (malocclusion).
The use of a radiation monitoring device composed of material which emits light after being illuminated. The amount of light emitted is proportional to the amount of IONIZING RADIATION to which the material has been previously exposed.
A variety of conditions affecting the anatomic and functional characteristics of the temporomandibular joint. Factors contributing to the complexity of temporomandibular diseases are its relation to dentition and mastication and the symptomatic effects in other areas which account for referred pain to the joint and the difficulties in applying traditional diagnostic procedures to temporomandibular joint pathology where tissue is rarely obtained and x-rays are often inadequate or nonspecific. Common diseases are developmental abnormalities, trauma, subluxation, luxation, arthritis, and neoplasia. (From Thoma's Oral Pathology, 6th ed, pp577-600)
Photosensitive afferent neurons located in the peripheral retina, with their density increases radially away from the FOVEA CENTRALIS. Being much more sensitive to light than the RETINAL CONE CELLS, the rod cells are responsible for twilight vision (at scotopic intensities) as well as peripheral vision, but provide no color discrimination.
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)
Resorption in which cementum or dentin is lost from the root of a tooth owing to cementoclastic or osteoclastic activity in conditions such as trauma of occlusion or neoplasms. (Dorland, 27th ed)
Radiography of the SALIVARY GLANDS or ducts following injection of contrast medium.
The most posterior teeth on either side of the jaw, totaling eight in the deciduous dentition (2 on each side, upper and lower), and usually 12 in the permanent dentition (three on each side, upper and lower). They are grinding teeth, having large crowns and broad chewing surfaces. (Jablonski, Dictionary of Dentistry, 1992, p821)
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.
A hollow part of the alveolar process of the MAXILLA or MANDIBLE where each tooth fits and is attached via the periodontal ligament.
A tooth from which the dental pulp has been removed or is necrotic. (Boucher, Clinical Dental Terminology, 4th ed)
A procedure consisting of a sequence of algebraic formulas and/or logical steps to calculate or determine a given task.
The total amount of radiation absorbed by tissues as a result of radiotherapy.
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)
The use of pre-treatment imaging modalities to position the patient, delineate the target, and align the beam of radiation to achieve optimal accuracy and reduce radiation damage to surrounding non-target tissues.
Behavior of LIGHT and its interactions with itself and materials.
Either of a pair of bones that form the prominent part of the CHEEK and contribute to the ORBIT on each side of the SKULL.
Devices, usually alloplastic, surgically inserted into or onto the jawbone, which support a single prosthetic tooth and serve either as abutments or as cosmetic replacements for missing teeth.
An abnormal hardening or increased density of bone tissue.
Computer systems or programs used in accurate computations for providing radiation dosage treatment to patients.
Photosensitive proteins expressed in the ROD PHOTORECEPTOR CELLS. They are the protein components of rod photoreceptor pigments such as RHODOPSIN.
The measurement of radiation by photography, as in x-ray film and film badge, by Geiger-Mueller tube, and by SCINTILLATION COUNTING.
CONFORMAL RADIOTHERAPY that combines several intensity-modulated beams to provide improved dose homogeneity and highly conformal dose distributions.
Devices which accelerate electrically charged atomic or subatomic particles, such as electrons, protons or ions, to high velocities so they have high kinetic energy.
The dense rock-like part of temporal bone that contains the INNER EAR. Petrous bone is located at the base of the skull. Sometimes it is combined with the MASTOID PROCESS and called petromastoid part of temporal bone.
Modality of computed tomography in which the patient is irradiated in a spiral path around the body with a cone or pyramid-shaped beam.
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.
Bony outgrowth usually found around joints and often seen in conditions such as ARTHRITIS.
Positively-charged atomic nuclei that have been stripped of their electrons. These particles have one or more units of electric charge and a mass exceeding that of the Helium-4 nucleus (alpha particle).
A dental specialty concerned with the maintenance of the dental pulp in a state of health and the treatment of the pulp cavity (pulp chamber and pulp canal).
A specialty concerned with the use of x-ray and other forms of radiant energy in the diagnosis and treatment of disease.
Recording of electric potentials in the retina after stimulation by light.
Specialized cells that detect and transduce light. They are classified into two types based on their light reception structure, the ciliary photoreceptors and the rhabdomeric photoreceptors with MICROVILLI. Ciliary photoreceptor cells use OPSINS that activate a PHOSPHODIESTERASE phosphodiesterase cascade. Rhabdomeric photoreceptor cells use opsins that activate a PHOSPHOLIPASE C cascade.
A branch of the external carotid artery which distributes to the deep structures of the face (internal maxillary) and to the side of the face and nose (external maxillary).
The observation, either continuously or at intervals, of the levels of radiation in a given area, generally for the purpose of assuring that they have not exceeded prescribed amounts or, in case of radiation already present in the area, assuring that the levels have returned to those meeting acceptable safety standards.
Presentation devices used for patient education and technique training in dentistry.
Usually a written medical and nursing care program designed for a particular patient.
The SKELETON of the HEAD including the FACIAL BONES and the bones enclosing the BRAIN.
The aftermost permanent tooth on each side in the maxilla and mandible.
Fractures of the lower jaw.
The use of an external beam of PROTONS as radiotherapy.
The facial skeleton, consisting of bones situated between the cranial base and the mandibular region. While some consider the facial bones to comprise the hyoid (HYOID BONE), palatine (HARD PALATE), and zygomatic (ZYGOMA) bones, MANDIBLE, and MAXILLA, others include also the lacrimal and nasal bones, inferior nasal concha, and vomer but exclude the hyoid bone. (Jablonski, Dictionary of Dentistry, 1992, p113)
The space in a tooth bounded by the dentin and containing the dental pulp. The portion of the cavity within the crown of the tooth is the pulp chamber; the portion within the root is the pulp canal or root canal.
Photosensitive protein complexes of varied light absorption properties which are expressed in the PHOTORECEPTOR CELLS. They are OPSINS conjugated with VITAMIN A-based chromophores. Chromophores capture photons of light, leading to the activation of opsins and a biochemical cascade that ultimately excites the photoreceptor cells.
The diversion of RADIATION (thermal, electromagnetic, or nuclear) from its original path as a result of interactions or collisions with atoms, molecules, or larger particles in the atmosphere or other media. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
Fixed or removable devices that join teeth together. They are used to repair teeth that are mobile as a result of PERIODONTITIS.
One of the eight permanent teeth, two on either side in each jaw, between the canines (CUSPID) and the molars (MOLAR), serving for grinding and crushing food. The upper have two cusps (bicuspid) but the lower have one to three. (Jablonski, Dictionary of Dentistry, 1992, p822)
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).
Adjustment of the eyes under conditions of low light. The sensitivity of the eye to light is increased during dark adaptation.
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.
Defects of color vision are mainly hereditary traits but can be secondary to acquired or developmental abnormalities in the CONES (RETINA). Severity of hereditary defects of color vision depends on the degree of mutation of the ROD OPSINS genes (on X CHROMOSOME and CHROMOSOME 3) that code the photopigments for red, green and blue.
Irrigation of the nose with saline or irrigation solutions for diagnostic or therapeutic purposes. It is used to remove irritants, allergens, or microorganisms from the nose.
Malocclusion in which the mandible and maxilla are anteroposteriorly normal as reflected by the relationship of the first permanent molar (i.e., in neutroclusion), but in which individual teeth are abnormally related to each other.
Peculiarities associated with the internal structure, form, topology, or architecture of organisms that distinguishes them from others of the same species or group.
The comparison of the quantity of meaningful data to the irrelevant or incorrect data.
Resorption or wasting of the tooth-supporting bone (ALVEOLAR PROCESS) in the MAXILLA or MANDIBLE.
Biocompatible materials placed into (endosseous) or onto (subperiosteal) the jawbone to support a crown, bridge, or artificial tooth, or to stabilize a diseased tooth.
Diseases affecting or involving the PARANASAL SINUSES and generally manifesting as inflammation, abscesses, cysts, or tumors.
Insertion of an implant into the bone of the mandible or maxilla. The implant has an exposed head which protrudes through the mucosa and is a prosthodontic abutment.
The anatomical frontal portion of the mandible, also known as the mentum, that contains the line of fusion of the two separate halves of the mandible (symphysis menti). This line of fusion divides inferiorly to enclose a triangular area called the mental protuberance. On each side, inferior to the second premolar tooth, is the mental foramen for the passage of blood vessels and a nerve.
The total amount of a chemical, metal or radioactive substance present at any time after absorption in the body of man or animal.
Coagulated exudate isolated from several species of the tropical tree Palaquium (Sapotaceae). It is the trans-isomer of natural rubber and is used as a filling and impression material in dentistry and orthopedics and as an insulator in electronics. It has also been used as a rubber substitute.
Any of the eight frontal teeth (four maxillary and four mandibular) having a sharp incisal edge for cutting food and a single root, which occurs in man both as a deciduous and a permanent tooth. (Jablonski, Dictionary of Dentistry, 1992, p820)
Discrete concentrations of energy, apparently massless elementary particles, that move at the speed of light. They are the unit or quantum of electromagnetic radiation. Photons are emitted when electrons move from one energy state to another. (From Hawley's Condensed Chemical Dictionary, 11th ed)
The upper part of the human body, or the front or upper part of the body of an animal, typically separated from the rest of the body by a neck, and containing the brain, mouth, and sense organs.
Determination, by measurement or comparison with a standard, of the correct value of each scale reading on a meter or other measuring instrument; or determination of the settings of a control device that correspond to particular values of voltage, current, frequency or other output.
Bony cavity that holds the eyeball and its associated tissues and appendages.
Photosensitive proteins in the membranes of PHOTORECEPTOR CELLS such as the rods and the cones. Opsins have varied light absorption properties and are members of the G-PROTEIN-COUPLED RECEPTORS family. Their ligands are VITAMIN A-based chromophores.
The curve formed by the row of TEETH in their normal position in the JAW. The inferior dental arch is formed by the mandibular teeth, and the superior dental arch by the maxillary teeth.
An optical source that emits photons in a coherent beam. Light Amplification by Stimulated Emission of Radiation (LASER) is brought about using devices that transform light of varying frequencies into a single intense, nearly nondivergent beam of monochromatic radiation. Lasers operate in the infrared, visible, ultraviolet, or X-ray regions of the spectrum.
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.
Radiotherapy where there is improved dose homogeneity within the tumor and reduced dosage to uninvolved structures. The precise shaping of dose distribution is achieved via the use of computer-controlled multileaf collimators.
A detailed review and evaluation of selected clinical records by qualified professional personnel for evaluating quality of dental care.
A class of statistical methods applicable to a large set of probability distributions used to test for correlation, location, independence, etc. In most nonparametric statistical tests, the original scores or observations are replaced by another variable containing less information. An important class of nonparametric tests employs the ordinal properties of the data. Another class of tests uses information about whether an observation is above or below some fixed value such as the median, and a third class is based on the frequency of the occurrence of runs in the data. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed, p1284; Corsini, Concise Encyclopedia of Psychology, 1987, p764-5)
Specialized PHOTOTRANSDUCTION neurons in the vertebrates, such as the RETINAL ROD CELLS and the RETINAL CONE CELLS. Non-visual photoreceptor neurons have been reported in the deep brain, the PINEAL GLAND and organs of the circadian system.
The process in which light signals are transformed by the PHOTORECEPTOR CELLS into electrical signals which can then be transmitted to the brain.
A retrogressive pathological change in the retina, focal or generalized, caused by genetic defects, inflammation, trauma, vascular disease, or aging. Degeneration affecting predominantly the macula lutea of the retina is MACULAR DEGENERATION. (Newell, Ophthalmology: Principles and Concepts, 7th ed, p304)
Radiotherapy using high-energy (megavolt or higher) ionizing radiation. Types of radiation include gamma rays, produced by a radioisotope within a teletherapy unit; x-rays, electrons, protons, alpha particles (helium ions) and heavy charged ions, produced by particle acceleration; and neutrons and pi-mesons (pions), produced as secondary particles following bombardment of a target with a primary particle.
Studies to determine the advantages or disadvantages, practicability, or capability of accomplishing a projected plan, study, or project.
Devices for accelerating protons or electrons in closed orbits where the accelerating voltage and magnetic field strength varies (the accelerating voltage is held constant for electrons) in order to keep the orbit radius constant.
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.
That portion of the electromagnetic spectrum in the visible, ultraviolet, and infrared range.
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.
Unstable isotopes of fluorine that decay or disintegrate emitting radiation. F atoms with atomic weights 17, 18, and 20-22 are radioactive fluorine isotopes.
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.
Nerve fibers that are capable of rapidly conducting impulses away from the neuron cell body.
Elements of limited time intervals, contributing to particular results or situations.
Pathologic deposition of calcium salts in tissues.
Mental processing of chromatic signals (COLOR VISION) from the eye by the VISUAL CORTEX where they are converted into symbolic representations. Color perception involves numerous neurons, and is influenced not only by the distribution of wavelengths from the viewed object, but also by its background color and brightness contrast at its boundary.
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.
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.
A collective term for interstitial, intracavity, and surface radiotherapy. It uses small sealed or partly-sealed sources that may be placed on or near the body surface or within a natural body cavity or implanted directly into the tissues.
Sequential operating programs and data which instruct the functioning of a digital computer.
An area approximately 1.5 millimeters in diameter within the macula lutea where the retina thins out greatly because of the oblique shifting of all layers except the pigment epithelium layer. It includes the sloping walls of the fovea (clivus) and contains a few rods in its periphery. In its center (foveola) are the cones most adapted to yield high visual acuity, each cone being connected to only one ganglion cell. (Cline et al., Dictionary of Visual Science, 4th ed)
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.
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.
An oval area in the retina, 3 to 5 mm in diameter, usually located temporal to the posterior pole of the eye and slightly below the level of the optic disk. It is characterized by the presence of a yellow pigment diffusely permeating the inner layers, contains the fovea centralis in its center, and provides the best phototropic visual acuity. It is devoid of retinal blood vessels, except in its periphery, and receives nourishment from the choriocapillaris of the choroid. (From Cline et al., Dictionary of Visual Science, 4th ed)
The adjustment of the eye to variations in the intensity of light. Light adaptation is the adjustment of the eye when the light threshold is increased; DARK ADAPTATION when the light is greatly reduced. (From Cline et al., Dictionary of Visual Science, 4th ed)
Computer-based representation of physical systems and phenomena such as chemical processes.
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).
The use of a heavy ion particle beam for radiotherapy, such as the HEAVY IONS of CARBON.
The use of computers for designing and/or manufacturing of anything, including drugs, surgical procedures, orthotics, and prosthetics.
Any device or element which converts an input signal into an output signal of a different form. Examples include the microphone, phonographic pickup, loudspeaker, barometer, photoelectric cell, automobile horn, doorbell, and underwater sound transducer. (McGraw Hill Dictionary of Scientific and Technical Terms, 4th ed)
Physical motion, i.e., a change in position of a body or subject as a result of an external force. It is distinguished from MOVEMENT, a process resulting from biological activity.
Hereditary, progressive degeneration of the neuroepithelium of the retina characterized by night blindness and progressive contraction of the visual field.
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.
Substances used to allow enhanced visualization of tissues.
In statistics, a technique for numerically approximating the solution of a mathematical problem by studying the distribution of some random variable, often generated by a computer. The name alludes to the randomness characteristic of the games of chance played at the gambling casinos in Monte Carlo. (From Random House Unabridged Dictionary, 2d ed, 1993)
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.
Motion of an object in which either one or more points on a line are fixed. It is also the motion of a particle about a fixed point. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Examination of the interior of the eye with an ophthalmoscope.
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.
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.
The prototypical and most well-studied member of the semaphorin family. Semaphorin-3A is an axon-repulsive guidance cue for migrating neurons in the developing nervous system. It has so far been found only in vertebrates, and binds to NEUROPILIN-1/plexin complex receptors on growth cones. Like other class 3 semaphorins, it is a secreted protein.
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.
The act, process, or result of passing from one place or position to another. It differs from LOCOMOTION in that locomotion is restricted to the passing of the whole body from one place to another, while movement encompasses both locomotion but also a change of the position of the whole body or any of its parts. Movement may be used with reference to humans, vertebrate and invertebrate animals, and microorganisms. Differentiate also from MOTOR ACTIVITY, movement associated with behavior.
The first seven VERTEBRAE of the SPINAL COLUMN, which correspond to the VERTEBRAE of the NECK.
The relationship between the dose of administered radiation and the response of the organism or tissue to the radiation.
Detection and counting of scintillations produced in a fluorescent material by ionizing radiation.
Analytical technique for studying substances present at enzyme concentrations in single cells, in situ, by measuring light absorption. Light from a tungsten strip lamp or xenon arc dispersed by a grating monochromator illuminates the optical system of a microscope. The absorbance of light is measured (in nanometers) by comparing the difference between the image of the sample and a reference image.
X-ray visualization of the chest and organs of the thoracic cavity. It is not restricted to visualization of the lungs.
The use of IONIZING RADIATION to treat malignant NEOPLASMS and some benign conditions.
A statistical technique that isolates and assesses the contributions of categorical independent variables to variation in the mean of a continuous dependent variable.
Radiographic visualization of the body between the thorax and the pelvis, i.e., within the peritoneal cavity.
LIGHT, it's processes and properties, and the characteristics of materials interacting with it.
Radiography of the vascular system of the heart muscle after injection of a contrast medium.
Pieces of glass or other transparent materials used for magnification or increased visual acuity.
Function of the human eye that is used in bright illumination or in daylight (at photopic intensities). Photopic vision is performed by the three types of RETINAL CONE PHOTORECEPTORS with varied peak absorption wavelengths in the color spectrum (from violet to red, 400 - 700 nm).
In tissue culture, hairlike projections of neurons stimulated by growth factors and other molecules. These projections may go on to form a branched tree of dendrites or a single axon or they may be reabsorbed at a later stage of development. "Neurite" may refer to any filamentous or pointed outgrowth of an embryonal or tissue-culture neural cell.
The visually perceived property of objects created by absorption or reflection of specific wavelengths of light.
Methods and procedures for the diagnosis of diseases of the eye or of vision disorders.
Unstable isotopes of carbon that decay or disintegrate emitting radiation. C atoms with atomic weights 10, 11, and 14-16 are radioactive carbon isotopes.
The amount of mineral per square centimeter of BONE. This is the definition used in clinical practice. Actual bone density would be expressed in grams per milliliter. It is most frequently measured by X-RAY ABSORPTIOMETRY or TOMOGRAPHY, X RAY COMPUTED. Bone density is an important predictor for OSTEOPOROSIS.
Studies in which individuals or populations are followed to assess the outcome of exposures, procedures, or effects of a characteristic, e.g., occurrence of disease.
Type of vision test used to determine COLOR VISION DEFECTS.
Pathological processes of CORONARY ARTERIES that may derive from a congenital abnormality, atherosclerotic, or non-atherosclerotic cause.
Organs which might be damaged during exposure to a toxin or to some form of therapy. It most frequently refers to healthy organs located in the radiation field during radiation therapy.
A genus of the Ambystomatidae family. The best known species are the axolotl AMBYSTOMA MEXICANUM and the closely related tiger salamander Ambystoma tigrinum. They may retain gills and remain aquatic without developing all of the adult characteristics. However, under proper changes in the environment they metamorphose.
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).

Correction of patient positioning errors based on in-line cone beam CTs: clinical implementation and first experiences. (1/574)

BACKGROUND: The purpose of the study was the clinical implementation of a kV cone beam CT (CBCT) for setup correction in radiotherapy. PATIENTS AND METHODS: For evaluation of the setup correction workflow, six tumor patients (lung cancer, sacral chordoma, head-and-neck and paraspinal tumor, and two prostate cancer patients) were selected. All patients were treated with fractionated stereotactic radiotherapy, five of them with intensity modulated radiotherapy (IMRT). For patient fixation, a scotch cast body frame or a vacuum pillow, each in combination with a scotch cast head mask, were used. The imaging equipment, consisting of an x-ray tube and a flat panel imager (FPI), was attached to a Siemens linear accelerator according to the in-line approach, i.e. with the imaging beam mounted opposite to the treatment beam sharing the same isocenter. For dose delivery, the treatment beam has to traverse the FPI which is mounted in the accessory tray below the multi-leaf collimator. For each patient, a predefined number of imaging projections over a range of at least 200 degrees were acquired. The fast reconstruction of the 3D-CBCT dataset was done with an implementation of the Feldkamp-David-Kress (FDK) algorithm. For the registration of the treatment planning CT with the acquired CBCT, an automatic mutual information matcher and manual matching was used. RESULTS AND DISCUSSION: Bony landmarks were easily detected and the table shifts for correction of setup deviations could be automatically calculated in all cases. The image quality was sufficient for a visual comparison of the desired target point with the isocenter visible on the CBCT. Soft tissue contrast was problematic for the prostate of an obese patient, but good in the lung tumor case. The detected maximum setup deviation was 3 mm for patients fixated with the body frame, and 6 mm for patients positioned in the vacuum pillow. Using an action level of 2 mm translational error, a target point correction was carried out in 4 cases. The additional workload of the described workflow compared to a normal treatment fraction led to an extra time of about 10-12 minutes, which can be further reduced by streamlining the different steps. CONCLUSION: The cone beam CT attached to a LINAC allows the acquisition of a CT scan of the patient in treatment position directly before treatment. Its image quality is sufficient for determining target point correction vectors. With the presented workflow, a target point correction within a clinically reasonable time frame is possible. This increases the treatment precision, and potentially the complex patient fixation techniques will become dispensable.  (+info)

Cone-beam micro-CT system based on LabVIEW software. (2/574)

Construction of a cone-beam computed tomography (CBCT) system for laboratory research usually requires integration of different software and hardware components. As a result, building and operating such a complex system require the expertise of researchers with significantly different backgrounds. Additionally, writing flexible code to control the hardware components of a CBCT system combined with designing a friendly graphical user interface (GUI) can be cumbersome and time consuming. An intuitive and flexible program structure, as well as the program GUI for CBCT acquisition, is presented in this note. The program was developed in National Instrument's Laboratory Virtual Instrumentation Engineering Workbench (LabVIEW) graphical language and is designed to control a custom-built CBCT system but has been also used in a standard angiographic suite. The hardware components are commercially available to researchers and are in general provided with software drivers which are LabVIEW compatible. The program structure was designed as a sequential chain. Each step in the chain takes care of one or two hardware commands at a time; the execution of the sequence can be modified according to the CBCT system design. We have scanned and reconstructed over 200 specimens using this interface and present three examples which cover different areas of interest encountered in laboratory research. The resulting 3D data are rendered using a commercial workstation. The program described in this paper is available for use or improvement by other researchers.  (+info)

On-line target position localization in the presence of respiration: a comparison of two methods. (3/574)

PURPOSE: To compare two "four-dimensional" methods for image-guided target localization in the presence of respiration. METHODS AND MATERIALS: Four-dimensional image guidance was performed with two methods. A respiration-correlated computed tomography (RCCT) was acquired on a CT simulator, and an average CT (AVG-CT) image was generated from the RCCT. A respiration-correlated cone-beam CT (RC-CBCT) and a free-breathing cone-beam CT (FB-CBCT) were acquired. The "RCCT method" consisted of calculating the mean target position on both the RCCT and RC-CBCT, registering the RCCT to the RC-CBCT, and determining the shift in the mean target position from the planned mean position. The "AVG-CT method" consisted of registering the AVG-CT to the FB-CBCT. The ability of each to measure the shift in the mean target position was compared, both in a respiratory phantom and in 8 patients. RESULTS: In phantom, the RCCT and AVG-CT methods were able to measure the true mean target position to within 0.15 cm and 0.10 cm, respectively. In the patient study, the mean error between the methods was 0.13 cm (left-right), 0.14 cm (anterior-posterior), and 0.10 cm (cranio-caudal). The error was not observed to vary with tumor position or magnitude of tumor motion. CONCLUSIONS: Respiration may impact the on-line image guidance process. The RCCT method enables localization of the mean tumor position and measurement of changes in the motion pattern, whereas the AVG-CT method is simple, fast, and easily implemented. We found the methods to be nearly equivalent in detecting shifts in the mean tumor position.  (+info)

Development of three-dimensional FE modeling system from the limited cone beam CT images for orthodontic tipping tooth movement. (4/574)

Previously, numerous three-dimensional finite element (FE) models of the dentoalveolar complex have been developed and stress analyses of orthodontic tooth movements were reported. Most of the models were, however, developed based on average anatomical data, but not on individual data. The aim of this study, therefore, was to investigate dentoalveolar stress distribution by lingual and distal tipping tooth movements using FE models of individual teeth based on the limited cone beam CT (3DX) images. Three extracted teeth (lower canine, upper molar, and lower molar) were used to test the three-dimensional reconstruction procedure in terms of accuracy and reproducibility in linear dimensions and sizes. From the stress analysis of the three different models, the equivalent stress in tipping movement concentrated at the cervical region of the PDL and bone crest in all teeth. It was suggested that the FE modeling technique based on 3DX in this study is recommended for the individual determination of optimal orthodontic force for effective tooth movement.  (+info)

Balancing radiation dose and image quality: clinical applications of neck volume CT. (5/574)

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Monte Carlo investigations of megavoltage cone-beam CT using thick, segmented scintillating detectors for soft tissue visualization. (6/574)

Megavoltage cone-beam computed tomography (MV CBCT) is a highly promising technique for providing volumetric patient position information in the radiation treatment room. Such information has the potential to greatly assist in registering the patient to the planned treatment position, helping to ensure accurate delivery of the high energy therapy beam to the tumor volume while sparing the surrounding normal tissues. Presently, CBCT systems using conventional MV active matrix flat-panel imagers (AMFPIs), which are commonly used in portal imaging, require a relatively large amount of dose to create images that are clinically useful. This is due to the fact that the phosphor screen detector employed in conventional MV AMFPIs utilizes only approximately 2% of the incident radiation (for a 6 MV x-ray spectrum). Fortunately, thick segmented scintillating detectors can overcome this limitation, and the first prototype imager has demonstrated highly promising performance for projection imaging at low doses. It is therefore of definite interest to examine the potential performance of such thick, segmented scintillating detectors for MV CBCT. In this study, Monte Carlo simulations of radiation energy deposition were used to examine reconstructed images of cylindrical CT contrast phantoms, embedded with tissue-equivalent objects. The phantoms were scanned at 6 MV using segmented detectors having various design parameters (i.e., detector thickness as well as scintillator and septal wall materials). Due to constraints imposed by the nature of this study, the size of the phantoms was limited to approximately 6 cm. For such phantoms, the simulation results suggest that a 40 mm thick, segmented CsI detector with low density septal walls can delineate electron density differences of approximately 2.3% and 1.3% at doses of 1.54 and 3.08 cGy, respectively. In addition, it was found that segmented detectors with greater thickness, higher density scintillator material, or lower density septal walls exhibit higher contrast-to-noise performance. Finally, the performance of various segmented detectors obtained at a relatively low dose (1.54 cGy) was compared with that of a phosphor screen similar to that employed in conventional MV AMFPIs. This comparison indicates that for a phosphor screen to achieve the same contrast-to-noise performance as the segmented detectors approximately 18 to 59 times more dose is required, depending on the configuration of the segmented detectors.  (+info)

In vivo comparison of conventional and cone beam CT synthesized cephalograms. (7/574)

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Asymmetric vascular stent: feasibility study of a new low-porosity patch-containing stent. (8/574)

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Purpose: Compressed sensing (CS)-based iterative reconstruction (IR) techniques are able to reconstruct cone-beam CT (CBCT) images from undersampled noisy data, allowing for imaging dose reduction. However, there are a few practical concerns preventing the clinical implementation of these techniques. On the image quality side, data truncation along the superior-inferior direction under the cone-beam geometry produces severe cone artifacts in the reconstructed images. Ring artifacts are also seen in the half-fan scan mode. On the reconstruction efficiency side, the long computation time hinders clinical use in image-guided radiation therapy (IGRT). Methods: Image quality improvement methods are proposed to mitigate the cone and ring image artifacts in IR. The basic idea is to use weighting factors in the IR data fidelity term to improve projection data consistency with the reconstructed volume. In order to improve the computational efficiency, a multiple graphics processing units (GPUs)-based ...
Purpose: Due to the limited number of projections at each phase, the image quality of a four-dimensional cone-beam CT (4D-CBCT) is often degraded, which decreases the accuracy of subsequent motion modeling. One of the promising methods is the simultaneous motion estimation and image reconstruction (SMEIR) approach. The objective of this work is to enhance the computational speed of the SMEIR algorithm using adaptive feature-based tetrahedral meshing and GPU-based parallelization. Methods: The first step is to generate the tetrahedral mesh based on the features of a reference phase 4D-CBCT, so that the deformation can be well captured and accurately diffused from the mesh vertices to voxels of the image volume. After the mesh generation, the updated motion model and other phases of 4D-CBCT can be obtained by matching the 4D-CBCT projection images at each phase with the corresponding forward projections of the deformed reference phase of 4D-CBCT. The entire process of this 4D-CBCT reconstruction ...
DOI: 10.11607/jomi.3524 Purpose: To evaluate the influence of the milliamperage settings on cone beam computed tomography (CBCT) images for qualitative and quantitative preoperative implant planning. Materials and Methods: Eight dry mandibles were scanned under different milliamperage values (2, 4, 6.3, 8, 10, 12, and 15 mA) available for selection on the Kodak 9000 CBCT unit. Cross-sectional slices of incisor, canine, premolar, first molar, and second molar regions were analyzed by three oral radiologists. A subjective image quality evaluation of the anatomical structures and an objective evaluation using bone height measurements compared with the real measurements obtained in the mandible were performed. After 30 days, 25% of the sample was reevaluated to obtain the reproducibility of the results. Results: The weighted-kappa coefficient and intraclass correlation coefficient for intra- and interobserver agreement varied between moderate and substantial agreement for the image quality ...
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We investigate lesion detectability and its trends for different noise structures in single-slice and multislice CBCT images with anatomical background noise. Anatomical background noise is modeled using a power law spectrum of breast anatomy. Spherical signal with a 2 mm diameter is used for modeling a lesion. CT projection data are acquired by the forward projection and reconstructed by the Feldkamp-Davis-Kress algorithm. To generate different noise structures, two types of reconstruction filters (Hanning and Ram-Lak weighted ramp filters) are used in the reconstruction, and the transverse and longitudinal planes of reconstructed volume are used for detectability evaluation. To evaluate single-slice images, the central slice, which contains the maximum signal energy, is used. To evaluate multislice images, central nine slices are used. Detectability is evaluated using human and model observer studies. For model observer, channelized Hotelling observer (CHO) with dense difference-of-Gaussian ...
Conebeam CT (CBCT) is an imaging technique that employs a divergent x-ray source and usually a large-area flat-panel detector to form a cone-shaped exposure to the imaged object. Such a configuration guarantees the volume coverage of one large object and achieves the volumetric imaging within one single scan. The first CBCT scanner entered the market in 1996 as the dental scanner by NewTom Corp. Subsequently, CBCT was extended to multiple clinical applications, including implantology, orthopedics, interventional radiology, and radiation oncology.
Differences between IG using 4D-CBCT as gold standard and the two IG techniques using 3D-CBCT were 3.6 mm (IG-3D) and 1.9 mm (IG-ITV) on average. These uncertainties of 3D CBCT IG appear especially large when compared to the average base-line shift of 4.9 mm in our study, the reason for performing soft-tissue IG. Korreman et al. estimated the residual uncertainty of the IG procedure to 20 % of the initial motion [5], which is optimistic based on our results. Differences in the tumor position between 4D-CBCT and 3D-CBCT based IG increased with increasing motion magnitude of the pulmonary targets and increased with worse image quality scores of 3D-CBCT. These results clearly indicate that 3D-CBCT is not fully sufficient for full motion integration into IG.. This finding of improved accuracy using 4D-CBCT compared to 3D-CBCT is in contrast to the study by Hugo et al. [7], which could be explained by two reasons. First, our study is based on a larger number of patients and poor image quality of the ...
C-arm cone-beam computed tomography (CT)-guided transthoracic lung core needle biopsy (CNB) is a safe and accurate procedure for the evaluation of patients with pulmonary nodules. This article will focus on the clinical features related to CNB in terms of diagnostic performance and complication rate. Moreover, the concept of categorizing pathological diagnosis into 4 categories, which could be used for clinical management, follow-up, and quality assurance is also introduced. We retrospectively collected data regarding 375 C-arm cone-beam CT-guided CNBs from January 2010 and June 2014. Clinical and radiological variables were evaluated in terms of success or failure rate. Pathological reports were inserted in 4 homogenous groups (nondiagnostic--L1, benign--L2, malignant not otherwise specified--L3, and malignant with specific histotype--L4), defining for each category a hierarchy of suggested actions. The sensitivity, specificity, and positive and negative predictive value and accuracy for ...
C-arm cone-beam computed tomography (CT)-guided transthoracic lung core needle biopsy (CNB) is a safe and accurate procedure for the evaluation of patients with pulmonary nodules. This article will focus on the clinical features related to CNB in terms of diagnostic performance and complication rate. Moreover, the concept of categorizing pathological diagnosis into 4 categories, which could be used for clinical management, follow-up, and quality assurance is also introduced. We retrospectively collected data regarding 375 C-arm cone-beam CT-guided CNBs from January 2010 and June 2014. Clinical and radiological variables were evaluated in terms of success or failure rate. Pathological reports were inserted in 4 homogenous groups (nondiagnostic--L1, benign--L2, malignant not otherwise specified--L3, and malignant with specific histotype--L4), defining for each category a hierarchy of suggested actions. The sensitivity, specificity, and positive and negative predictive value and accuracy for ...
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The purpose of this study was to assess the structural characteristics of styloid process (SP) by cone-beam computed tomography (CBCT) examination in a patient population suffering from orofacial pain. The second aim was to assess the prevalence of elongated SP and its relation to gender, site and subjective symptoms in the study population. Clinical and radiographic records of 208 patients were evaluated retrospectively. Radiological examinations including measurements of the structure, length, and medial angulations of SP were performed on CBCT images. Out of 208 patients, 96 (46%) had not-elongated SP, 28 (13%) had left side, 16 (8%) had right side, and 68 (33%) had bilateral elongation of SP. The patients with elongated SP had significantly decreased angle values. There were no statistically significant differences in length values of SP between males and females in both groups. Significantly increased prevalence of symptoms except headache was observed in patients with elongated SP. This study
According to a new report published by Allied Market Research, titled, CBCT Systems Market: Global Opportunity Analysis and Industry Forecast, 2017-2023, the global CBCT systems market was valued at $536 million in 2016, and is projected to reach $1,041 million by 2023, growing at a CAGR of 9.9% from 2017 to 2023. Dental application segment held more than four-fifths share of the total market in 2016.. Cone beam computed tomography (CBCT) systems are a special type of x-ray equipment. These systems are used by medical professionals to reconstruct a 3D image of various regions of patients anatomy such as dental, oral and maxillofacial region, and ears, nose and throat.. Request for Summary of Report at https://www.alliedmarketresearch.com/request-free-sample/2274. Rise in geriatric population, wide range of applications of CBCT systems in dental practice and upsurge in number of patients suffering from dental diseases are expected to drive the market growth. Moreover, expanding application of ...
Dr. Mark Taff & Dr. Brad Levine specializes in using the Cone Beam, CT Scan and 3-D Imaging for advanced views below the surface. Schedule your appointment today to see Dr. Mark Taff & Dr. Brad Levine and get a closer look at your oral health.
Obtaining high-resolution CT scans for clinical applications is challenging, However, it could help better understand and treat such bone diseases as osteoporosis. High-resolution peripheral computed tomography (HR-pQCT) is considered the best technique in vivo. However, a breakthrough for clinical practice is lacking due to a relatively long acquisition time, which inhibits scanning of large field of view (FOV) in vivo. A promising alternative is the high-resolution cone-beam computed tomography (CBCT), which is already the gold standard in many dental and maxillofacial applications. The top high-resolution CBCT scanners on the market (eg., Newtom 5G) feature a fast scanning time (18 à 31s), a large FOV (12x12x8cm3) and a low radiation dosage, in addition to a high resolution (voxel size down to 75µm). Yet, CBCT is impaired by the presence of image artefacts that reduce image contrast, leading to it being currently used for qualitative evaluation only ...
For most offline calibration methods, a specific phantom scanning is often required before the following imaging tasks. Its time-consuming and unable to be applied to the unstable systems. Some online approaches dont have such drawbacks but their accuracy cannot fulfil requirements compared with the offline ones. This paper proposes an Epipolar geometry consistency based online geometric calibration for cone beam CT(CBCT). Four parameters: the detector skew, rotation axis, mid-plane and the source to detector distance are employed for geometrical modeling of CBCT in this paper. A cost function is built by exploiting the Epipolar geometry consistency among the projective views. By taking advantage of the simplex-simulated annealing algorithm(SIMPSA) algorithm to minimize the cost function, we can obtain the geometric parameters of our practical CBCT systems for image reconstruction. In simulation, different noise levels are added to projection images respectively and the experimental results ...
CBCT Systems Market was worth $536 million in 2016, and is estimated to reach $1,041 million by 2023, growing at a CAGR of 9.9% during the study period.
REFERENCES. 1. Farman AG, Scarfe WC. Development of imaging selection criteria and procedures should precede cephalometric assessment with cone-beam computed tomography. Am J Orthod Dentofacial Orthop. 2006;130(2):257-65. [ Links ] 2. Schulze D, Heiland M, Thurmann H, Adam G. Radiation exposure during midfacial imaging using 4- and 16-slice computed tomography, cone-beam computed tomography systems and conventional radiography. Dentomaxillofac Radiol. 2004;33(2):83-6. [ Links ] 3. Silva MA, Wolf U, Heinicke F, Bumann A, Visser H, Hirsch E. Cone-beam computed tomography for routine orthodontic treatment planning: a radiation dose evaluation. Am J Orthod Dentofacial Orthop. 2008;133(5):640.e1-5. [ Links ] 4. Tsiklakis K, Donta C, Gavala S, Karayianni K, Kamenopoulou V, Hourdakis CJ. Dose reduction in maxillofacial imaging using low dose Cone-beam CT. Eur J Radiol. 2005;56(3):413-7. [ Links ] 5. Scarfe W, Farman A. What is cone-beam CT and how does it work? Dent Clin North Am. 2008;52(4):707-30. [ ...
Exact Interior Reconstruction with Cone-Beam CT. . Biblioteca virtual para leer y descargar libros, documentos, trabajos y tesis universitarias en PDF. Material universiario, documentación y tareas realizadas por universitarios en nuestra biblioteca. Para descargar gratis y para leer online.
We present a detailed derivation of the phase-retrieval formula based on the phase-attenuation duality that we recently proposed in previous brief communication. We have incorporated the effects of x-ray source coherence and detector resolution into the phase-retrieval formula as well. Since only a single image is needed for performing the phase retrieval by means of this new approach, we point out the great advantages of this new approach for implementation of phase tomography. We combine our phase-retrieval formula with the Feldkamp-Davis-Kresss (FDK) cone-beam reconstruction algorithm to provide a three-dimensional phase tomography formula for soft tissue objects of relatively small sizes, such as small animals or human breast. For large objects we briefly show how to apply Katsevichs cone-beam reconstruction formula to the helical phase tomography as well.. ©2005 Optical Society of America. Full Article , PDF Article ...
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Patient is aware of fee payable on the day to Taverham Dental Health Clinic- £75 OPG/ £250 CBCT scan. Our files will be exported as a DICOM file and bundled with the Sirona viewer, which can be sent electronically, posted on a USB or simply collected by your patient. Taverham Dental Health Clinic does not routinely report on CBCT scans. To comply with the IR(ME)R 2000 regulations all CBCT scans are required to be reviewed and reported in the clinical notes by the referring practitioner or by a radiologist. The operator at Taverham Dental Health Clinic will take a scan with the lowest dose, smallest field of view, and the best resolution according to the area of interest and clinical indications, in line with IR(ME)R and ALARP. The age, anatomy and physical build of the patient are all dependant factors ...
Dental cone beam CT emits less radiation and provides a more complete picture than CT and CAT scans. Hospital CTs work by taking a series of parallel X-ray images of the head, from top to bottom. That leaves gaps between each image, which have to be filled by the computers educated guesses, and that many X-rays come with a lot of radiation.. A cone beam CT circles the head, which overlaps each image or slice, leaving no gaps. The radiation is also much weaker. The most radiation hits the the area of interest, which is where the images overlap to construct the 3D model. This is how CBCT is able to provide a more complete image with less radiation exposure. ...
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diagnostic imaging method in which a computer is used to generate a three-dimensional image of the internal of an object using a series of two-dimensional X-ray image slices taken around a single axis of rotation. Cone Beam refers to the type of X-Ray projection and is important because it allows users to image a small well defined volume such as the lower face and mouth at low radiation dosage. Thats the definition, but what does it mean in the real world of dental diagnostics? One of the most important concepts to understand with Cone Beam CT is that the user is imaging a volume (like a model), not just a single plane (like a photo). However in actual use it is even better. That is because the user can not only view the model from any angle but the user can view inside the model as if the jaws and teeth were sliced with a band saw to expose a cross section. These band saw slices can be made at any angle, at any depth and can be viewed as a series of slices as if the user was slowly passing ...
For the past decade, some dental offices have changed their view of radiography, literally. Cone Beam Computerized Tomography (CBCT) scanners presented the opportunity to obtain a 3-dimensional view of the mouth, that improved diagnosis, facilitated treatment planning and enhanced opportunities for patient education. Before in-office CBCTs became available, many patients who needed 3-D scans were referred out to hospital or imaging centers to obtain medical CTs. This was not only inconvenient and time consuming, but also exposed dental patients to more radiation than was necessary for dental treatment. Recently, articles have appeared cautioning the public about the increased health risks from medical CT scans. While it is worthwhile to take precautions to avoid exposure to unnecessary radiation, it is also important to avoid confusing radiation exposure statistics of medical CTs with those of dental CBCT scans.. ...
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There is a growing interest in minimally invasive implant therapy as a standard prosthodontic treatment, providing complete restoration of occlusal function. A new treatment method (CADDIMA), which combines both computerized tomographic (CT) and optical laser-scan data for planning and design of surgical guides, implant abutments, and prosthetic devices, is described. Imaging using a NewTom 3G cone beam CT scanner and a modified laser triangulation scanner D200c is discussed, as are impression and surgical guide fabrication, which allow for flapless, precise implant placement and an accurate provisional prosthesis. The new approach gives the operator full control over the design of the implant prosthesis for planning of proper occlusal relations and shows promise for further evaluation ...
This study evaluated the potential impact of different visualisation methods of cone-beam computed tomography (CBCT) on the accuracy of linear measurements of calcified structures, and assessed their interchangeability. High resolution (0.125 mm voxel) CBCT scans were obtained from eight cadaveric heads. The distance between the alveolar bone ridge and the incisal edge was determined for all mandibular incisors and canines, both anatomically and with measurements based on the following five CBCT visualisation methods: isosurface, direct volume rendering, multiplanar reformatting (MPR), maximum intensity projection of the volume of interest (VOIMIP), and average intensity projection of the volume of interest (VOIAvIP). All radiological methods were tested for repeatability and compared with anatomical results for accuracy, and limits of agreement were established. Interchangeability was evaluated by reviewing disparities between the methods and disclosing deterministic differences. Fine intra- ...
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Scattered photons highly degrade the quality of X-ray images and their effect has become more important due to the increasing interest in cone-beam geometry for the acquisition of CT (CBCT) and micro-CT data. The random nature of scatter events and the great i Scattered photons highly degrade the quality of X-ray images and their effect has become more important due to the increasing interest in cone-beam geometry for the acquisition of CT (CBCT) and micro-CT data. The random nature of scatter events and the great influence of the sample suggest that the most accurate methods for their estimation are Monte Carlo (MC) techniques, but their use is usually hampered by the large computation time required to obtain an acceptable estimation of the scattered radiation. We present an approach for scatter correction in CBCT by MC estimation, speeding up the computation by means of general purpose graphic processing units (GPGPU) and developing a framework for the automatic correction and reconstruction ...
Objective: To determine the accuracy of volumetric analysis of teeth in vivo using cone-beam computed tomography (CBCT). Materials and Methods: The physical volume (Vw) of 24 bicuspids extracted for orthodontic purposes (16 were imaged with the I-CAT and 8 with the CB MercuRay) were determined using the water displacement technique. Corresponding pretreatment CBCT image data were uploaded into Amira 4.0 for segmentation and radiographic volume (Va). All measurements were performed twice by two observers. The statistical difference between Vw and Va was assessed using a paired Hest. The intraobserver and interobserver reliability were determined by calculating Pearson correlation coefficients and intraclass correlation coefficients. Results: The overall mean Vw of teeth specimens was 0.553 +/- 0.082 cm(3), while the overall mean Va was 0.548 +/- 0.079 cm(3) (0.529 +/- 0.078 cm(3) for observer 1 and 0.567 +/- 0.085 cm(3) for observer 2). There were statistically significant differences between Va ...
Dr. Mone uses advanced dental technology including the Cone Beam CT Scan for a more precise placement of dental implants in Braintree, MA. Call to learn more!
PRIMARY OBJECTIVES:. I. Establish the technical feasibility of MRI for performing functional soft-tissue targeting of radiotherapy in the pelvis and thorax. (Group I) II. Acquire clinical MR imaging data to evaluate image quality tradeoffs and operational parameter settings. (Group I) III. Validate the selection of MRI technique factors by comparing visibility of soft tissue structures in MRIs, cone beam (CB)CTs and fan beam (FB)CTs of the same patient. (Group II) IV. Assess the feasibility of using deformable image registration to map contours from FBCT to MRI, CBCT to MRI, MRI to MRI and vice versa. (Group II) V. Compare morphologic and functional changes in target and normal structures, visualized on MRI, CBCT and FBCT images, in response to radiation therapy and identify opportunities for treatment adaptation. (Group II). OUTLINE:. Patients undergo MRI and FBCT at baseline, within the first 3 weeks of radiotherapy and between week 4 and 6 of radiotherapy. Patients with lung cancer may ...
Planmed, based in Helsinki, Finland, is releasing an upgraded new version of its popular Planmed Verity CBCT (Cone Beam Computed Tomography) extremity
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This clinical trial studies magnetic resonance imaging (MRI), cone beam computed tomography (CT), and fan beam CT in detecting soft tissue in patients w
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Intraoperative cone-beam computed tomography and multi-slice computed tomography in temporal bone imaging for surgical treatment.: CBCT provides comparable imag
Cone-beam (CB) computed tomography (CT) is widely used in the field of medical imaging for guidance. Inspired by Betrams directional interpolation (BDI) methods, directional sinogram interpolation (DSI) was implemented to generate more CB projection
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Tyler, TX (PRWEB) March 29, 2014 -- Patients of Dr. Loyd Dowd can now benefit from the detailed three-dimensional images produced by the Cone Beam CT scan
A cone beam CT scan involves a special type of x-ray that allows us to see the details of your oral and facial health. This scan is more than just a typical x-ray, since it allows us to identify nerve pathways, soft tissue and bone before providing you with treatment. This gives us a clear view of your oral health so that treatment is easier and more effective for you. The scan takes just seconds in our office and provides us with a highly detailed image ...
The report EMEA 3D CBCT/Cone Beam CT Systems Market by Application (Dental (Oral and Maxillofacial Surgery, Implantology, Orthodontic, Endodontic) and Non-Dental (Radiology, ENT)), End User (Hospitals and [read full press release…]. ...
Planmeca PlanScan is a powder-free system that utilizes blue-laser technology to capture high-quality data for more precise prosthetics. This plug-and-play technology gives users the freedom to simultaneously scan and collaborate at multiple workstations. ...
CBCT in dentistry recommended uses and comparisons of the different CBCT units available. CBCT research comparing different machines.
What is Dental Cone Beam CT?. Dental cone beam computed tomography (CT) is a special type of x-ray machine used in situations where regular dental or facial x-rays are not sufficient. It is not used routinely because the radiation exposure from this scanner is significantly more than regular dental x-rays. This type of CT scanner uses a special type of technology to generate three dimensional (3-D) images of dental structures, soft tissues, nerve paths and bone in the craniofacial region in a single scan. Images obtained with cone beam CT allow for more precise treatment planning.. Metal objects, including jewelry, eyeglasses, dentures and hairpins, may affect the CT images and should be left at home or removed prior to your exam. You may also be asked to remove hearing aids and removable dental work. You may be asked to remove any piercings, if possible. Cone beam CT is not the same as conventional CT. However, dental cone beam CT can be used to produce images that are similar to those produced ...
X-ray computed tomography (CT) is instrumental in medicine, industry and homeland security, which depicts internal structures of an object from its shadows projected in a fan-beam or cone-beam from an x-ray source along a appropriate trajectory. We published the first paper on spiral conebeam CT in 1991 to solve the long object problem. Now, spiral conebeam scanning has been widely used in modern CT scanners, in which conebeam rotation and table translation are simultaneously performed, and spiral cone-beam CT remains a major area in CT research and development ...
This report (HPA-RPD-065) provides guidance on 2 important areas of radiation protection related to dental cone beam CT equipment.
Recently, several computed tomography (CT) machines with multirow detectors have been introduced on the market. Although the projections are obtained from a cone beam rather than a fan beam, multislice reconstruction algorithms in contemporary machines are firmly rooted in two-dimensional (2D) reconstruction of planar objects. Short-scan algorithms are dominating and these are preferably classified according to how redundant data are handled, using parallel rebinning, complementary rebinning, or Parker weighting. In the long run, truly 3D cone-beam algorithms are likely to take over, however. It has proved to be quite a challenge to design an algorithm that is both practical and exact under the constraints set by helical source path geometry. All attempts in this direction are readily seen to be derivatives of Grangeats algorithm. Alternative research efforts have been building on the nonexact algorithm by Feldkamp et al. (J Opt Soc Am 1: 612-619, 1984). These algorithms strive for simplicity ...
In recent years the development of cone-beam reconstruction algorithms has been an active research area in x-ray computed tomography (CT), and significant progress has been made in the advancement of algorithms. Theoretically exact and computationally efficient analytical algorithms can be found in the literature. However, in single photon emission computed tomography (SPECT), published cone-beam reconstruction algorithms are either approximate or involve iterative methods. The SPECT reconstruction problem is more complicated due to degradations in the imaging detection process, one of which is the effect of attenuation of gamma ray photons. Attenuation should be compensated for to obtain quantitative results. In this paper, an analytical reconstruction algorithm for uniformly attenuated cone-beam projection data is presented for SPECT imaging. The algorithm adopts the DBH method, a procedure consisting of differentiation and backprojection followed by a finite inverse cosh-weighted Hilbert transform.
Methods: Different kV-CBCT acquisition modes with different tube voltage (kV) and exposure (mAs) were studied: pelvis and pelvis obese with a Varian Truebeam™ (unit 1), pelvis and low dose thorax with a Varian Clinac 2100CD (unit 2). Using the TomoTherapy® Cheese phantom (Gammex RMI, Middleton, WI) for HU to electron density (de) calibration curve, and the NEMA body water phantom for HU uniformity, noise and mean water number analysis, were investigated. From the FBCT and kV-CBCT HU differential histograms, frequency peaks representing water, air, lung, soft tissue and bone were compared. Results: For unit 2, streaking and ring artifacts are much greater than for unit 1 as well as HU uniformity is deteriorated. Noise values are comparable between units but standard deviation is twice at unit 2. Peaks observed in the differential histograms are broader in kV-CBCT than those of FBCT especially for high tissue density. kV-CBCT uniformity is more degraded than in FBCT because CBCT is more ...
This report (HPA-CRCE-010) outlines measures for protection from radiation doses from dental cone beam computed tomography (CBCT) examinations.
Materials and methods Cone beam CT (CBCT) was performed using a flat panel detector angiography system. Datasets were reconstructed from 620 projection images acquired over a 200° arc (rotation time 20.7 s) at 80 kVp and a total of 260 mAs. To maximize spatial resolution, projection images were obtained using a small detector format (22 cm) and reconstructions were performed without pixel binning.. A contrast injection protocol was optimized in a porcine model for balance between stent visualization host vessel opacification. Three different intracranial stents were deployed in the internal maxillary arteries of two Yorkshire swine. Selective CBCT angiography was performed at contrast concentrations between 10 and 30% (Iopamidol 51%, by volume in normal saline) and flow rates between 0.5 and 3.5 ml/s. The CBCT datasets were reviewed and the optimal combination of parameters was used for clinical testing.. The clinical study was approved by our institutional review board. 57 CBCT examinations of ...
The BEC model was developed by the AAP to address emerging clinical topics in periodontology for which there is insufficient evidence to arrive at definitive conclusions. Using current high-quality published literature and the expert opinion of periodontal thought leaders, the BEC model aims to provide clinicians with reasonable applications of newer technologies, such as CBCT.. As new technologies emerge, it often takes many years for sufficient high-quality evidence to allow clinicians to appropriately incorporate the technology into patient care, said Kenneth Kornman, DDS, PhD, editor of the Journal of Periodontology. The BEC reports are designed to bridge the gaps and provide evidence summaries and expert interpretations that guide clinical use now. We anticipate that the BEC reports will help us apply new technologies in a focused manner to help improve the health of our patients.. Introduced just over 20 years ago, CBCT technology provides a beneficial tool for periodontists to use in ...
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A new method to reduce artifacts (MAR), produced by high-density objects, especially metal implants (MI), in X-ray CBCT is presented. MIs located in the field of view (FOV) result in artifacts influencing clinical diagnostics and treatments. The novel method reduces metal artifacts by virtually replacing MIs by tissue objects of the same shape. This corrected data can be reconstructed with significantly reduced artifacts. After reconstruction, the segmented 3D MIs were re-inserted into the corrected 3D volume. The method was developed for mobile C-arm CBCTs, where misalignments between original 2D data and forward projections must be adjusted before correction ...
Cone Beam CT of the Head and Neck An Anatomical Atlas PDF Download | Chung How Kau, Kenneth Abramovitch, Sherif Galal Kamel, Marko Bozic Cone Beam CT of the Head and Neck presents normal anatomy of the head using photographs of cadavers
WaterMed provides quality and cheap dental x-ray machine. All CBCT machine enjoys excellent technical support. The portable dental x-ray machine is hot-selling for its features, while The dental x-ray unit is well-known for its cost performance.
Materials and methods: Two registration methods based on optical flow estimation have been programmed to run on a graphics programming unit (GPU). One of these methods by Horn & Schunck is tested on a 4DCT thorax data set with 10 phases and 41 landmarks identified per phase. The other method by Cornelius & Kanade is tested on a series of six 3D cone beam CT (CBCT) data sets and a conventional planning CT data set from a head and neck cancer patient. In each of these data sets 6 landmark points have been identified on the cervical vertebrae and the base of skull. Both CBCT to CBCT and CBCT to CT registration is performed. Results: For the 4DCT registration average landmark error was reduced by deformable registration from 3.5 ± 2.0 mm to 1.1 ± 0.6 mm. For CBCT to CBCT registration the average bone landmark error was 1.8 ± 1.0 mm after rigid registration and 1.6 ± 0.8 mm after deformable registration. For CBCT to CT registration errors were 2.2 ± 0.6 mm and 1.8 ± 0.6 mm for rigid and deformable
Due to low radiation dose, cone-beam computed tomography is growing in importance. In image reconstruction, a stack of cross-sectional images can be recons
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Planmeca MAKES STRATEGIC INVESTMENT IN E4D TECHNOLOGIES. Helsinki, Finland, December 23, 2013 - Planmeca, the worlds largest privately owned dental imaging company and equipment manufacturer, announced today that it has made a non-controlling, strategic investment in E4D Technologies, LLC, developer of the E4D CAD/CAM Restorative System. This strategic investment reinforces Planmecas on-going commitment to help dental providers improve patient care by offering a comprehensive portfolio of integrated digital dental solutions for dentists and dental laboratories.. Planmeca will co-develop CAD/CAM products with E4D Technologies and offer these products in North America under the brand names Planmeca PlanScan-E4D Technologies and PlanMill-E4D Technologies. Henry Schein, Inc. will continue to be the exclusive distributor in the U.S., Canada, Australia, and New Zealand. In addition, Planmeca will expand distribution of the E4D system to more than 120 additional international markets under the ...
In point-based rigid-body registration, target registration error (TRE) is an important measure of the accuracy of the performed registration. The registrations accuracy depends on the fiducial localization error (FLE) which, in turn, is due to the
Compressive Sensing (CS) theory has great potential for reconstructing Computed Tomography (CT) images from sparse-views projection data and Total Variation- (TV-) based CT reconstruction method is very popular. However, it does not directly incorporate prior images into the reconstruction. To improve the quality of reconstructed images, this paper proposed an improved TV minimization method using prior images and Split-Bregman method in CT reconstruction, which uses prior images to obtain valuable previous information and promote the subsequent imaging process. The images obtained asynchronously were registered via Locally Linear Embedding (LLE). To validate the method, two studies were performed. Numerical simulation using an abdomen phantom has been used to demonstrate that the proposed method enables accurate reconstruction of image objects under sparse projection data. A real dataset was used to further validate the method.
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INTRODUCTION: The purpose of this study was to propose a protocol for safe bicortical placement of mini-implants by measuring the interradicular spaces of the maxillary teeth and the bone quality.. METHODS: Cone-beam computed tomography data were obtained from 50 adults. Three-dimensional reconstructions and measurements were made with SimplantPro software (Materialise, Leuven, Belgium). For each interradicular site, the bone thicknesses and interradicular distances at the planes 1.5, 3, 6, and 9 mm above the cementoenamel junction were measured. Standard bone units were defined to evaluate the influences of bone density and the different placement patterns on the stability of the mini-implants.. RESULTS: The safe interradicular sites in the maxilla for bicortical placement of 1.5-mm-diameter mini-implants were in all planes between the first and second premolars, and between the second premolar and the first molar. The safe palatal sites were between the first and second molars, and the safe ...
PLX3000A Panoramic Imaging Digital CBCT Dental system Usage of PLX3000A dental CBCT system with 3D imaging system PLX3000A is widely used for dental CT diagnostic with 12cm*15cm flat panel detector, mainly for oral and maxillofacial surgeries,...
To provide a comprehensive assessment of patient setup accuracy in 6 degrees of freedom (DOFs) using 2-dimensional/3-dimensional (2D/3D) image registration with on-board 2-dimensional kilovoltage (OB-2DkV) radiographic images we evaluated cranial head and neck KN-93 (HN) and thoracic and abdominal sites KN-93 under clinical conditions. axis. The windows/level adjustments for optimal visualization of the bone in OB-2DkV and DRRs were performed prior to registration. Ideal patient alignment at the isocenter was calculated and used as an initial registration position. In 3D/3D registration cone-beam CT (CBCT) was aligned to simCT on bony structures using a bone density filter in 6DOF. Included in this retrospective study were 37 patients treated in 55 fractions with frameless stereotactic radiosurgery or stereotactic body radiotherapy for cranial and paraspinal cancer. A cranial phantom was used to serve as a control. In all cases CBCT images were acquired for patient setup with subsequent OB-2DkV ...
Quantitative three-dimensional assessment of buccal alveolar bone thickness with dental cone-beam computed tomography, Salmeh Kalbassi, Foong Weng Chiong, Hwang Yee Cheau, Wong Hun
was created late 2016 to investigate the potential of the technology, to test and validate research hypotheses and to promote the use of validated measurement methods. The CBCT scanner is mounted on a C-arm in the IR suite, which offers real time imaging with a stationary patient. This eliminates the time needed to transfer a patient from the angiography suite to a conventional computed tomography scanner and facilitates a broad spectrum of applications of CBCT during IR procedures. The clinical applications of CBCT in IR include treatment planning, device or implant positioning and assessment, intra-procedural localization, and assessment of procedure endpoints. CBCT is useful as a primary and supplemental form of imaging. It is an excellent adjunct to DSA and fluoroscopy for soft tissue and vascular visibility during complex procedures. The use of CBCT before fluoroscopy potentially reduces patient radiation exposure. Chemoembolization for Hepatocellular Carcinoma: CBCT with contrast confirms ...
PubMed journal article A Cone-Beam Computed Tomographic Study on Mandibular First Molars in a Chinese Subpopulatio were found in PRIME PubMed. Download Prime PubMed App to iPhone or iPad.
In this work several algorithms for diaphragm detection in 2D views of cone-beam computed tomography (CBCT) raw data are developed. These algorithms are tested on 21 Siemens megavoltage CBCT scans of lungs and the result is compared against the diaphragm apex identified by human experts. Among these algorithms dynamic Hough transform is sufficiently quick and accurate for motion determination prior to radiation therapy. The diaphragm was successfully detected in all 21 data sets, even for views with poor image quality and confounding objects. Each CBCT scan analysis (200 frames) took about 38 seconds on a 2.66 GHz Intel quad-core 2 CPU. The average cranio-caudal position error was 1.707 ± 1.117 mm. Other directions were not assessed due to uncertainties in expert identification.
Villa Verde hospital invests in technology and expertise in order to enhance their services to citizens and professionals.. Finally, also in Reggio Emilia it is possible to perform a 1.5 Tesla MRI using the latest fully digitized equipment. This equipment features innovative technology, tunnels wider and shorter than the previous generation of instruments and is considerably less noisy.. This type of non-invasive instrument can display with extreme precision the nervous system, skeleton, joints and internal organs without the use of radiation. A few days ago the Villa Verde polyclinic hospital - a healthcare provider of the national health system - started using their 1.5 Tesla machine, one of the most modern and technical advanced on the market today to perform comprehensive examinations with significantly better image quality, opening new horizons for clinical applications for organ systems that were difficult to evaluate before.. The Radiology staff of Villa Verde polyclinic hospital has also ...
Implant placing procedure. During the first meeting, the correct diagnosis is established based on CBCT scans or digital orthopan images, and a thorough specialist examination is performed. The patient is presented with the various dental care solutions of the situation at hand, taking into account his or her wishes.. The next stage after the clinical inspection is the planning of oral rehabilitation or the implanting intervention itself and familiarising the patient with the procedures.. The intervention is quick and painless - it takes approximately 20 minutes under local anaesthesia. The surgeon places a titanium screw into the jawbone, sutures the wound and lets the implant to bond (osseointegrates) with the bone.. The time to heal depends on the state of the patients bones and complexity of the intervention, but it usually takes from 3 to 6 months. During this period, a temporary crown or teeth can be made upon the patients request. When the bone heals, we proceed and manufacture the ...
Methods: CBCT images are commonly degraded by scattered radiations originating in the patient's body, and so the CT numbers of the CBCT images depend on data acquisition conditions and the patient size. However, the anatomical shape of each organ is not likely affected by scattered radiations, and so we used only the shape of major organs such as lungs and bones in the CBCT images, and replaced these CT numbers with those of the multi-slice CT (MSCT) images that were used for dose calculation in a treatment planning. As regards this alternative CT number we adopted the median of MSCT numbers in a segmented region of a major organ each corresponding to that in the CBCT images. We evaluated the validity of our segmented region (SR) method with images of eight patients with lung diseases. The number of irradiation beams was four. In this evaluation we used the distance-to-agreement (DTA) and γ analysis, and the dose-volume-histogram (DVH) analysis ...
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20. Introduction to Cone Beam Computed Tomography. Ernest W. N. Lam. This technology, first described in 1998 for applications in dentistry (Mozzo et al., 1998), employs a cone-shaped X-ray beam emanating from a point source coupled with a planar digital sensor. During image acquisition, both the radiation source and sensor rotate around the patient, who is stationary. There are two classes of cone beam systems currently, ones that employ small fields of view with dimensions of less than 8 cm, and large fields of view with dimensions of greater than 8 cm upward to 30 cm.. Unlike intraoral digital imaging, the anatomy of the area imaged is recreated in three dimensions rather than two. The three-dimensional (3D) elements that recreate the anatomy are referred to as cube-shaped volume elements or voxels. Small field of view systems (Figure 20.1) employ pixel dimensions as low as 0.076 mm while the larger field machines employ pixel dimensions of between 0.20 mm and 0.40 mm.. ...
There is strong evidence to support the hypothesis that increasing radiation dose to the prostate will increase the probability of cure. A major difficulty in pursuing dose escalation is the toxicity induced in the surrounding normal tissues. These normal tissues are irradiated as a consequence of planning margins used to guarantee the delivery of the prescribed dose to the entire clinical target volume prostate and seminal vesicles. The margins are constructed from clinical knowledge of uncertainties in daily patient positioning and organ motion. In these investigations, a new imaging technology, cone-beam computed tomography CT was developed to localize the prostate and surrounding tissues on a daily basis, allowing the radiation field to be applied with great precision. By increasing precision, more conformal treatment fields can be applied, reducing the dose to surrounding normal tissues and allowing the safe pursuit of dose escalation. This new imaging modality, flat-panel based cone-beam CT, has
Introduction Since the first introduced use of cone beam computed tomography (CBCT) in the maxillo¬facial region it has been increasingly popular. In contrast to 2D imaging modalities such as periapical and panoramic radiographic techniques, CBCT provides some valuable information from...
Press release - Transparency Market Research - Cone Beam Computed Tomography (CBCT) Market - Positive long-term growth outlook 2023 - published on openPR.com
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An X-ray projection exposure apparatus includes a mask stage configured to hold a mask having a predetermined pattern thereon, a substrate stage configured to hold a substrate, and an X-ray source that emits exposing X-rays and detection light having a wavelength different from the exposing X-rays for use in detecting a position of at least one of the mask and the substrate. The apparatus further includes an X-ray illumination optical system configured to direct the exposing X-rays and the detection light towards the mask, an X-ray projection and focusing optical system for receiving the exposing X-rays that have interacted with the mask, and projecting and focusing an image of the predetermined pattern on the mask onto the substrate, and a detector for detecting the detection light that has interacted with the mask to derive the position of the at least one of the mask and the substrate.
Cleveland, OH (PRWEB) February 12, 2015 -- Plexar Associates, Inc. announces the completion and peer review submittal of a detailed compilation report:
Despite Dr. Christensens blunt evaluation of the state of the U.S. implant business, the atmosphere throughout the discussion that followed was that of a lively and cordial scholarly debate, peppered with humorous asides. When the efficacy of mini-implants was being discussed, M. Nader Sharifi, DDS, expressed his approval for the devices accordingly: Theres a risk of dropping the tiny screw into the patients mouth, but the greatest risk is dropping it on the floor, asking the staff to bring it into sterilization, and then requesting the other one.. Through it all, Dr. Christensen, who practices in a predominantly lower-income region, kept the dialogue rooted in actionable solutions. Were back to boutique dentistry. Lets talk about real people, he chided one panelist.. Balancing those realms drove the discussion about the usage of cone-beam CT (CBCT) for even a single implant. While the panel agreed that CBCT allows for a more informed procedure, only about five of the roughly three ...
H. Salehi, M. Mahdian, H. Alnajjar, and A. Tadinada, Utilizing Optical Coherence Tomography and Cone Beam Computed Tomography for Oral Tissues Characterization: ex vivo Study, in Biomedical Optics 2016, OSA Technical Digest (online) (Optical Society of America, 2016), paper JTu3A.52 ...
Authors: Jorge NR Martins, Moataz-Bellah AM Alkhawas, Zaher Altaki, Gianmarco Bellardini, Luiza Berti, Carlos Boveda, Antonis Chaniotis, Daniel Flynn, Jose Antonio Gonzalez, Jojo Kottoor, Miguel Seruca Marques, Adam Monroe, Hani F Ounsi, Peter Parashos, Gianluca Plotino, Magnus E Ragnarsson, Ruben Rosas Aguilar, Fabio Santiago, Hussein C Seedat, Walter Vargas, Murilo von Zuben, Yuerong Zhang, Yongchun Gu, Antonio Ginjeira
Cone beam computed tomography imaging represents a paradigm shift for enhancing diagnosis and treatment planning. Questions regarding cone beam computed tomographys associated legal responsibility are addressed, including cone beam tomography necessity, recognition of pathosis in the scans entire volume, adequate training, informed consent and/or refusal and current court status of cone bean computed tomography. Judicious selection and prudent use of cone beam computed tomography technology to protect and promote patient safety and efficacious treatment complies with the standard of care.. ...
CBVT, or Cone Beam Volumetric Tomography, is a compact, fast and safe way of acquiring 3D dental imaging. No appointment needed, just bring your referral.
October 9, 2008 -- X-ray imaging in dentistry is rapidly moving toward 3D, and it is time for general dentists to take note. The first FDA-approved cone-beam CT (CBCT) system was in the year 2000, but since that time many competitors have entered the marketplace. Discuss ...
Cone Beam Computed Tomography. Semin Orthod 2009;15:1-84. Lemke HU, Vannier MW, Inamura K, Farman AG, Doi K (editors). Computer ... Farman is founder and chair of the International Congress on Computed Maxillofacial Imaging (CMI) that has its 17th Annual ...
Cone beam computed tomography (CBCT) is useful in diagnosing DI. It provides clinicians a detailed 3D image and could aid ... "Diagnosis and endodontic treatment of type II dens invaginatus by using cone-beam computed tomography and splint guides for ...
"Comparison of gray values of cone-beam computed tomography with hounsfield units of multislice computed tomography: An in vitro ... Cone beam computed tomography: Bone density and the Hounsfield scale. Diagnostic radiology physics: a handbook for teachers and ... HU-based differentiation of material applies to medical-grade dual-energy CT scans but not to cone beam computed tomography ( ... ISBN 978-1-936366-69-9. De Vos, W.; Casselman, J.; Swennen, G.R.J. (June 2009). "Cone-beam computerized tomography (CBCT) ...
Radiation Oncology: Medical imaging, 4D Cone beam computed tomography, 4D MRI. Radiology: Computer-Aided Diagnosis, Distributed ... and Ubiquitous computing. Motai has two children, Yamato and Yurika. They both go to Maggie L. Walker Governor's School. ... Fundamentals of robotic vision and data-intensive computing. Adaptive Prediction: Kalman filter bank, Optimized prediction, ...
Patel, S.; Brown, J.; Pimentel, T.; Kelly, R. D.; Abella, F.; Durack, C. (2019). "Cone beam computed tomography in Endodontics ...
Mah, P.; Reeves, T. E.; McDavid, W. D. (2010). "Deriving Hounsfield units using grey levels in cone beam computed tomography". ... Cybermed has become the first in the world to introduce cone beam CT image processing software as well as first in Korea to ... "Anthropometric analysis of maxillary anterior buccal bone of Korean adults using cone-beam CT". The Journal of Advanced ...
... cone-beam computed tomography (CBCT) and computed tomography (CT) data sets. The purpose of the tool is to make it easy for ... "Image analysis and superimposition of 3-dimensional cone beam computed tomography models". American Journal of Orthodontics and ...
"Cone-beam computed tomography with a flat-panel imager: Initial performance characterization". Medical Physics. American ...
For diagnosis of the TMJ, Cone beam computed tomography (CBCT) can also be useful. Treatment is frequently by means of removal ...
Cone beam computed tomography (CBCT), also known as digital volume tomography (DVT), is a special type of X-ray technology that ... Estrela C, Bueno MR, Leles CR, Azevedo B, Azevedo JR (March 2008). "Accuracy of cone beam computed tomography and panoramic and ... Jacobs R, Salmon B, Codari M, Hassan B, Bornstein MM (May 2018). "Cone beam computed tomography in implant dentistry: ... Pelekos G, Acharya A, Tonetti MS, Bornstein MM (May 2018). "Diagnostic performance of cone beam computed tomography in ...
Shukla, S; Chug, A; Afrashtehfar, K. I (2017). "Role of Cone Beam Computed Tomography in Diagnosis and Treatment Planning in ... Newer technologies are available (e.g. cone-beam CT scanning) that allow more efficient, scientific measurements to be taken of ... The standard endodontic technique involves inserting a gutta-percha cone (a "point") into the cleaned-out root canal along with ...
Using cone beam computed tomography, the patient and the existing prosthesis are being scanned. Furthermore, the prosthesis ... Image-guided surgery and CAS in ENT commonly consists of navigating preoperative image data such as CT or cone beam CT to ... Intraoperative navigation in the maxillofacial area based on 3D imaging obtained by a cone-beam device. Int J Oral Maxillofac ... Where necessary, the transition of the gold cone caps to the mucosa can be isolated with rubber dam rings. The new prosthesis ...
"Designing a novel dental root analogue implant using cone beam computed tomography and CAD/CAM technology". Clinical Oral ... "Anatomic Customization of Root-Analog Dental Implants With Cone-Beam CT and CAD/CAM Fabrication: A Cadaver-Based Pilot ...
The most ideal way to evaluate the bone is by a cone beam computed tomography (CBCT) scan. The All-on-4 protocol is for at ...
In special instances, Cone beam computed tomography is preferable to measure the sinus's height and width, and to rule out any ... and postoperative assessment of sinus grafting procedures using cone-beam computed tomography compared with panoramic ...
Now, with the introduction of cone beam computed tomography (CBCT), it is possible to view root fractures three-dimensionally. ...
A Cone-beam Computed Tomography Study". Journal of Endodontics. 42 (4): 538-41. doi:10.1016/j.joen.2015.12.026. PMID 26873567. ... Recent studies have shown that use of cone-down CT scans can detect accessory canals that would have been missed in 23% of ...
An example of IGRT would include comparison of a cone beam computed tomography (CBCT) dataset, acquired on the treatment ... Cone-beam computed tomography (CBCT) based image guided systems have been integrated with medical linear accelerators to great ... Megavoltage computed tomography (MVCT) is a medical imaging technique that uses the Megavoltage range of X-rays to create an ... Cone beam CT acquires many projections over the entire volume of interest in each projection. Using reconstruction strategies ...
2017). Isolated tympanic plate fracture detected by cone-beam computed tomography: report of four cases with review of ... "The identification of mandible fractures by helical computed tomography and panorex tomography". The Journal of Craniofacial ... Computed tomography is the most sensitive and specific of the imaging techniques. The facial bones can be visualized as slices ... Research has shown that panoramic radiography is similar to computed tomography in its diagnostic accuracy for mandible ...
... of root anatomy of permanent mandibular premolars and molars in a Korean population with cone-beam computed tomography." ...
Industrial CT Scanning Radiology Computed Tomography Medical Imaging Cone beam reconstruction Flat-panel volume CT: fundamental ... The x-ray beam used in volume CT is cone shaped, in contrast to the fan shaped beam of the regular CT scanner. This cone shape ... Flat-panel Volume CT is a technique under development to make computed tomography images with improved performance (in ... allows the beam to cover the two-dimensional detector panel. ...
A cone-beam computed tomography study in a northern Taiwanese population". Journal of Dental Sciences. 13 (2): 138-144. doi: ...
Intraoperative acquisition of a cone beam computed tomography image can also be used to reconstruct three dimensional CT-like ... Among the former is beam hardening. Among the latter are frame rate settings, pulsed fluoroscopy and collimation. Beam ... X-ray computed tomography (CT) scanners or magnetic resonance imaging (MRI) scanners. These imaging devices enable minimally- ... It is not possible to perform surgery in a regular magnetic resonance tomography room. Thus for step 2, there are two ways to ...
The feasibility of using cone beam computed tomography to diagnose ankylosed teeth is also explored and discussed in a recent ... cone beam computed tomography, and histological data: a retrospective observational case series study". European Journal of ... Diagnostic methods of tooth ankylosis include the use of clinical examinations, x-ray and cone beam computerized tomography ( ... cone beam computerized tomography (CBCT) is adopted to provide a 3-dimensional image for better clinical inspection of ...
Cone Beam Computed Tomography in Dental Education: A Survey of U.S., U.K., and Australian Dental Schools, Parashar et al., ... "Cone Beam Computed Tomography in Dental Education: A Survey of US, UK, and Australian Dental Schools - Research Portal, King's ... Allan G. Farman - Oral and Maxillofacial Radiologist and Professor Computed radiography Dental radiography Digital radiography ...
The introduction of cone beam computed tomography (CBCT) imaging allowed a lower radiation dose to patients, in comparison to ... Hintze H, Wiese M, Wenzel A (May 2007). "Cone beam CT and conventional tomography for the detection of morphological ... for detecting osseous abnormalities of the temporomandibular joint and its correlation with cone beam computed tomography". ... Studies have shown that tomography of the TMJ provided supplementary information that supersedes what is obtainable from ...
Three-dimensional localization of maxillary canines with cone-beam computed tomography. Am J of Orthod Dentofacial Orthop. 2005 ... Radiation Protection No172 - Cone Beam CT for dental and maxillofacial radiology (Evidence-based guidelines). Luxembourg: ... Ericson, S. Bjerklin, K. Falahat, B. Does the canine dental follicle cause resorption of permanent incisor roots? A computed ... Ericson S, Kurol J. Incisor root resorptions due to ectopic maxillary canines imaged by computerized tomography: a comparative ...
Data from Cone Beam Computed Tomography (CBCT) helps to create an accurate surgical template, thereby enhancing the success of ...
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 ... John Wong on the topic of cone beam computed tomography (CBCT) for image-guided radiation therapy (IGRT). The Beaumont team ...
... uses digital images of a patient's mouth and teeth using either a white light scanner or cone beam computed tomography (CBCT). ...
Single Photon Emission Computed Tomography). Another medical scintillography technique, the Positron-emission tomography (PET ... Cone beam. Targets. *Heart *calcium scan. *angiography. *Abdominal and pelvis *Virtual colonoscopy ... In contrast, SPECT and positron emission tomography (PET) form 3-dimensional images and are therefore classified as separate ... Hounsfield in 1974 for Computer Tomography (CT). Later, in 1985, the medal was awarded to Ziedses des Plantes himself. In 1977 ...
The introduction of cone beam computed tomography (CBCT) imaging allowed a lower radiation dose to patients, in comparison to ... for detecting osseous abnormalities of the temporomandibular joint and its correlation with cone beam computed tomography". ... Hintze H, Wiese M, Wenzel A (May 2007). "Cone beam CT and conventional tomography for the detection of morphological ... Computerised tomography (CT)Edit. Studies have shown that tomography of the TMJ provided supplementary information that ...
Conductivity of transparency Conductor gallop Cone beam computed tomography Configuration interaction Configuration space ... Computational geophysics Computational magnetohydrodynamics Computational physics Computed radiography Computed tomography ... Chemical affinity Chemical beam epitaxy Chemical force microscopy Chemical ionization Chemical laser Chemical oxygen iodine ... quantum computing) Concurrence principle Condensation Condensation (aerosol dynamics) Condensed Matter Condensed matter physics ...
Cone beam computed tomography) Dr. S.M Balaji was the founder and director of Balaji Dental and Craniofacial Hospital. He is an ... Balaji Dental and Craniofacial Hospital is the first dental hospital in Chennai and second in India to introduce Cone Beam CT ... Cone Beam CT Scan) Pharmacy City Doc gifts Sight to Pakistan Kid - A rare, successful surgery performed by a leading dental ...
"Computed tomography dose assessment for a 160 mm wide, 320 detector row, cone beam CT scanner". Physics in Medicine and Biology ... The computed tomography dose index (CTDI) is a commonly used radiation exposure index in X-ray computed tomography (CT), first ... "A method for describing the doses delivered by transmission x-ray computed tomography". Medical Physics. 8 (4): 488-495. ... Because CT scanners typically acquire multiple slices during a single rotation with a single beam, the CTDI is calculated by ...
Cone beam computed tomography (CBCT), image reconstruction in CT, and applications of CT and CBCT in orthopedics. He is faculty ... 49 (1). Zbijewski, W.; Beekman, F.J. (2006). "Efficient Monte Carlo based scatter artifact reduction in cone-beam micro-CT". ... Zbijewski research is focused on Computed tomography system optimization, algorithm development, and clinical applications, ... "A dedicated cone-beam CT system for musculoskeletal extremities imaging: design, optimization, and initial performance ...
... often cone beam computed tomography, and less frequently single-photon emission computed tomography and positron emission ... tomography. Treatment of condylar resorption is controversial. Orthodontics can address malocclusion without surgery, but this ...
Canada Helical cone beam computed tomography Cone beam computed tomography This disambiguation page lists articles associated ...
... cone beam etc.). As advanced alternative also ART-based approaches are utilized. For high resolution and speckle noise reduced ... Ultrasound computer tomography (USCT), sometimes also Ultrasound computed tomography, Ultrasound computerized tomography or ... Medical ultrasound Tomography Ultrasound transmission tomography Ultrasound-modulated optical tomography Avinash C. Kak, ... "Quantitative volumetric breast imaging with 3D inverse scatter computed tomography". Engineering in Medicine and Biology ...
If simple radiographs are deemed not to give enough information, cone beam computed tomography (CBCT) (special x-ray equipment ... Panoramic radiograph or paranasal computed tomography can help to locate the fistula, the size of it and to determine the ...
Typically used in human computed tomography systems. The cone-beam system is based on a 2D X-ray detector (camera) and an ... "Airway dimensions measured from micro-computed tomography and high-resolution computed tomography", Eur Respir J, 28 (4): 712- ... Virtually all tomography today is computed tomography. Micro-CT has applications both in medical imaging and in industrial ... X-ray microtomography, like tomography and X-ray computed tomography, uses X-rays to create cross-sections of a physical object ...
A 3D X-ray microscope uses the technique of computed tomography (microCT), rotating the sample 360 degrees and reconstructing ... The system consists of a circular annulus in the condenser, which produces a cone of light. This cone is superimposed on a ... in the condenser that splits light in an ordinary and an extraordinary beam. The spatial difference between the two beams is ... is also accomplished using beam shaping techniques incorporating multiple-prism beam expanders. The images are captured by CCDs ...
... single-photon emission computed tomography and X-ray computed tomography. Odds algorithm (Bruss algorithm) Optimal online ... Ambient occlusion Beam tracing Cone tracing Image-based lighting Metropolis light transport Path tracing Photon mapping ... computes shortest paths in a weighted graph (where some of the edge weights may be negative) Dijkstra's algorithm: computes ... a Monte Carlo method to compute the minimum cut of a connected graph Push-relabel algorithm: computes a maximum flow in a graph ...
Computed tomography (CT) is a medical imaging method which generates a three-dimensional image of the inside of an object from ... Scanners with a smaller beam width will help to solve this problem but will be limited by range as the beam width will increase ... Like most cameras, they have a cone-like field of view, and like cameras, they can only collect information about surfaces that ... For example, industrial computed tomography scanning, structured-light 3D scanners, LiDAR and Time Of Flight 3D Scanners can be ...
Retsky, Michael (31 July 2008). "Electron beam computed tomography: Challenges and opportunities". Physics Procedia. 1 (1): 149 ... "Mitigating motion artifacts in FDK based 3D Cone-beam Brain Imaging System using markers". Central European Journal of ... A computed tomography scan (usually abbreviated to CT scan; formerly called computed axial tomography scan or CAT scan) is a ... "Biomechanical computed tomography-noninvasive bone strength analysis using clinical computed tomography scans". Annals of the ...
... (or CBCT, also referred to as C-arm CT, cone beam volume CT, flat panel CT or Digital Volume ... due to the computationally demanding cone beam reconstruction algorithms. Computed tomography Cone beam reconstruction ... "Cone Beam-Computed Tomography in Endodontics" (PDF). www.aae.org. Summer 2011. Retrieved October 21, 2019. New AAOMR Guidelines ... Siewerdsen, Jeffrey (2019). "Cone-Beam CT Systems". In Samei, Ehsan; Pelc, Norbert (eds.). Computed Tomography: Approaches, ...
Computed tomography Industrial CT scanning Tomographic reconstruction Chris C. Shaw (14 February 2014). Cone Beam Computed ... cone beam reconstruction is one of two common scanning methods, the other being Fan beam reconstruction. Cone beam ... The method is referred to as cone-beam reconstruction because the X-rays are emitted from the source as a cone-shaped beam. In ... Instead of utilizing a single row of detectors, as fan beam methods do, a cone beam systems uses a standard charge-coupled ...
... to alignment estimation based on in-situ cone-beam computed tomography (CT) enrich the range of modern IGRT approaches. ... If the target is removed (and the beam current decreased) a high energy electron beam is obtained. Electron beams are useful ... A flattening filter is a cone of metal (typically tungsten); after the X-ray beam has passed through the flattening filter it ... This makes treatment planning simpler but also reduces the intensity of the beam significantly. With greater computing power ...
Computed tomography (CT scan) of the head will detect moderate to large sized VS but can miss small sized VS. VS appears as ... ice-cream-cone' appearance seen on MRIs. As 'space-occupying-lesions,' the tumors can reach 3 to 4 cm or more in size and ... intracranial targets without opening the skull using very high doses of ionizing radiation in stereotactically directed beams ...
A. Katsevich, 1999 Cone beam local tomography, SIAM J APPL MATH 59, 2224-2246. Ye. Yangbo, Yu. 1 Hengyong 2 and GeWang, Exact ... an algorithm for limited data cardiac computed tomography, IEEE trans Biomed Engineering 295 (1982), 333-340. J.H. Kim, K.Y. ... P.S. Cho, A.D. Rudd and R.H. Johnson, Cone-beam CT from width truncated projections, Computerized Medical Imaging and Graphics ... Local tomography, with a very short filter, is also known as lambda tomography. The local inverse method extends the concept of ...
... is a modern imaging technique adopted by the dental industry, providing doctors and ... Another modern innovation is the advent of slice-based computed tomography using a cone beam type X-ray source. CBCT makes use ... Intraoral computed radiography (CR). Intraoral digital radiography. Panoramic and cephalometric imaging. Cone beam computed ...
An Age Estimation Procedure Based on the 3D Cone Beam Computed Tomography (CBCT) Study of the Dental Pulp Volume in Adults. ...
Cone Beam Computed Tomography Market Size, Share & Trends Analysis Report By Application (Dental Implantology, Orthodontics), ... Cone Beam Computed Tomography Market Growth & Trends The global cone beam computed tomography market size is expected to reach ... Cone Beam Computed Tomography Market Size, Share & Trends Analysis Report By Application, By Patient Position, By End-use And ... Cone Beam Computed Tomography Market Report Highlights • Based on application, the dental implantology segment held the largest ...
Skeletal and dentoalveolar bilateral dimensions in unilateral palatally impacted canine using cone beam computed tomography. ... Skeletal and dentoalveolar bilateral dimensions in unilateral palatally impacted canine using cone beam computed tomography ... of subject with unilateral palatally impacted canine versus the unaffected contralateral side on cone beam computed tomography ...
... purpose of the present study is to investigate the relationship between the maxillary sinus and the canine root apices in cone ... beam computed tomographic images (CBCT) and to assess the amount of extension of the maxillary sinus to the anterior region of ... From: Assessment of the relationship between the maxillary sinus and the canine root tip using cone beam computed tomography ...
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Relationship between the bone density estimated by cone-beam computed tomography and the primary stability of dental implants. ... Relationship between the bone density estimated by cone-beam computed tomography and the primary stability of dental implants. ... Dive into the research topics of Relationship between the bone density estimated by cone-beam computed tomography and the ... Relationship between the bone density estimated by cone-beam computed tomography and the primary stability of dental implants. ...
T1 - Effect of voxel size in cone-beam computed tomography on surface area measurements of dehiscences and fenestrations in the ... Effect of voxel size in cone-beam computed tomography on surface area measurements of dehiscences and fenestrations in the ... Effect of voxel size in cone-beam computed tomography on surface area measurements of dehiscences and fenestrations in the ... Effect of voxel size in cone-beam computed tomography on surface area measurements of dehiscences and fenestrations in the ...
The aim of this study is to evaluate the nature and frequency of incidental findings in large-field maxillofacial cone beam ... computed tomography (CBCT). A total of 427 consecutive CBCT radiologic reports obtained for orthodontic purposes were ... Hatcher DC: Cone beam computed tomography: craniofacial and airway analysis. Dent Clin North Am. 2012, 56: 343-57. 10.1016/j. ... Cone beam computed tomography (CBCT) has been rapidly integrating into the field of dentistry to produce three-dimensional (3-D ...
Influence of acquisition parameters on the evaluation of mandibular third molars through cone beam computed tomography. ... Início Influence of acquisition parameters on the evaluation of mandibular third molars through cone beam computed tomography ... Influence of acquisition parameters on the evaluation of mandibular third molars through cone beam computed tomography ... Correlation between temporomandibular joint temporal component pneumatization and morphology: analysis by cone beam computed ...
Palavras-chave : Tomography; Diagnostic Imaging; Cone-Beam Computed Tomography. · resumo em Português · texto em Espanhol · pdf ... SANTOS, Thiago de Santana et al. The use of cone beam computed tomography in dentistry. Odontol. Clín.-Cient. (Online) [online ... "Beam Computed Tomography Volumetric, bringing many advantages over conventional tomography and medical, resulting in changes in ... Therefore, the objective of this work is to inform the reader about the computed tomography beam volume, emphasizing the ...
Comprehensive explorations of cone beam computed tomography artefacts and anatomic landmarks. *Practical discussions of cone ... Atlas of Cone Beam Computed Tomography delivers a robust collection of cases using this advanced method of imaging for oral and ... A thorough introduction to cone beam computed tomography, including in vivo and in vitro preparation and evaluation, ... In-depth examinations of cone beam computed tomography of pathological growth and development, including maxillofacial ...
Topography of mental foramen in a selected Belarusian population according to cone beam computed tomography, Sergey Lvovich ... cone beam computed tomography ▪ mental foramen ▪ anterior loop. Introduction. The mental foramen (MF) is a topographic ... Kiarudi AH, Eghbal MJ, Safi Y, et al. The applications of cone-beam computed tomography in endodontics: a review of literature ... In recent years the cone-beam computed tomography which was implemented in practical public health services in the late XX has ...
Levin M. Endodontics using cone beam computed tomography. In: Cone Beam Computed Tomography by D. Sarment, ed. John Wiley & ... Use of Cone Beam Computed Tomography in Endodontics. Int J Dent 2009;2009:634567. (Article in International Journal of ... Scarf WC, Farman AG, Levin MD, Gane D. Essentials of maxillofacial cone beam computed tomography. Alpha Omegan 2010:103(2);62- ... Levin M, Mischenko, A. Limited field cone beam computed tomography: Evaluation of endodontic healing in three cases. Alpha ...
Home » Dental Services » 3-D Cone Beam Computed Tomography. What Is a CBCT?. A CBCT is short for Cone Beam Computed Tomography ...
... ction in preoperative embolization for pelvic bone tumors. ...
Visualization features of canalis sinuosus with cone beam computed tomography. Auteur(s): Sedov, Yuri G. Avanesov, Anatoly M. ... with cone-beam computed tomography (CBCT). CBCT visualization has its own features, such as the change of slice thickness. The ... Visualization features of canalis sinuosus with cone beam computed tomography. Indian Journal of Dental Research. 2019 Sep; 30( ...
The current study aimed to compare the measurements of the mandible morphology using 3D cone beam computed tomography (CBCT) ... From: Comparison of measurements of mandible growth using cone beam computed tomography and its synthesized cephalograms ...
Cone-beam Computed Tomography (CBCT) Service. Type your search terms and click Enter/Return to see full results. ... Cone-beam computed tomography (CBCT) scans generate multiple projections that are immediately processed into 3-D images. The ... Veronica received specialized training for Cone-Beam Computed Tomography in private practice from Carestream and Planmeca. ... Forensic imaging of projectiles using cone-beam computed tomography. Forensic Science International 190 2009:38-41. ...
The purpose of this study was to evaluate a specific orthodontic communitys knowledge and understanding of Cone-Beam Computed ... Tomography (CBCT) technology as well as awareness of the implications of CBCT use, including risk assessment, radiation dose ... Libby, Warren D., "Cone-Beam Computed Tomography and Orthodontics: Awareness Assessment" (2011). Loma Linda University ... Cone-Beam Computed Tomography; Orthodontics; Loma Linda University - School of Dentistry; Radiography, Dental, Digital - ...
Cone Beam Computed Tomography: A Clinicians Guide to 3D Imaging includes 180 full colour images and illustrations, further ... Cone Beam Computed Tomography is an imaging technique in which x- rays diverge to form a cone. Cone Beam Computed Tomography: A ... Cone Beam Computed Tomography: A Clinicians Guide to 3D Imaging includes 180 full colour images and illustrations, further ... Cone Beam Computed Tomography: A Clinicians Guide to 3d Imaging. Price: 5 $. ...
A new cone-beam computed tomography-driven index for osteoporosis prediction. A new cone-beam computed tomography-driven index ... A new cone-beam computed tomography-driven index for osteoporosis prediction. Clin Oral Investig. 2020 Sep;24(9):3193-3202. ...
Global Cone Beam Computed Tomography (CBCT) market is forecasted to value over a CAGR of 10.4% from the forecast period 2022- ... Cone Beam Computed Tomography (CBCT) Market Cone Beam Computed Tomography (CBCT) Market Growth Cone Beam Computed Tomography ( ... Global Cone Beam Computed Tomography (CBCT) market is forecasted to value over a CAGR of 10.4% from the forecast period 2022- ... Global Cone Beam Computed Tomography (CBCT) market is forecasted to value over a CAGR of 10.4% from the forecast period 2022- ...
Cone Beam Computed Tomography. Cone beam computed tomography (CBCT) allows 2- and 3-dimensional image processing of maxillary ... Nervina J. Cone beam computed tomography use in orthodontics. Aust Dent J. 2012 Mar. 57 Suppl 1:95-102. [QxMD MEDLINE Link]. ... Cone Beam Computed Tomography in Oral Surgery. Relevant studies suggest that CBCT imaging is useful in providing guidance for ... Cone Beam Computed Tomography Radiology in Implant Dentistry. Since the development CBCT, there has been considerable research ...
... cone beam computed tomography. ... scalp sparing methodology and modified computed tomography (CT ... Lastly, we will review treatment techniques, including scalp sparing methodology and modified computed tomography (CT) ...
Cone-beam computed tomography versus digital periapical radiography in the detection of artificially created periapical lesions ... previously trained endodontists in the detection of artificially created periapical lesions using cone-beam computed tomography ...
Atlas of Cone Beam Computed Tomography. Edition No. 1. * Book. * 464 Pages ... Computing. Telecoms & Computing Back Telecoms & Computing View all telecoms & computing categories. *View all categories ...
Cone Beam Computed Tomography (CBCT) Evaluation of Bone Height and Width in Edentulous Mandible. ORIGINAL ARTICLE ... Mense C, Saliba-Serre B, Ferrandez AM, Hüe O, Ruquet M, Lalys L. Cone beam computed tomography analysis of the edentulous ... Home » Cone Beam Computed Tomography (CBCT) Evaluation of Bone Height and Width in Edentulous Mandible. ... The effect of removable partial dentures on alveolar bone resorption: a retrospective study with cone-beam computed tomography ...
Cone beam computed tomography (CBCT) is the most efficient imaging modality for assessment of implant site. The efficacy of.. ... Background and Objectives: Cone beam computed tomography (CBCT) is the most efficient imaging modality for assessment of ... Difference in implant measurements made on cone beam computed tomography scans taken with and without radiographic stent. ...
  • Cone beam CT imaging is performed with the help of a rotating platform with the X-ray source and detector and uses a single flat panel.Cone beam computed tomography (CBCT) produces a cone beam of radiation instead of a fan beam. (reportlinker.com)
  • The aim of this investigation was to compare skeletal and dentoalveolar measurements of subject with unilateral palatally impacted canine versus the unaffected contralateral side on cone beam computed tomography (CBCT). (altmetric.com)
  • Objectives: The aims of this study were to objectively assess bone quality with density values obtained by cone-beam computed tomography (CBCT) and to determine the correlations between bone density and primary stability of dental implants. (elsevier.com)
  • OBJECTIVES: This study aims to assess whether different voxel sizes in cone-beam computed tomography (CBCT) affected surface area measurements of dehiscences and fenestrations in the mandibular anterior buccal region. (rug.nl)
  • abstract = "OBJECTIVES: This study aims to assess whether different voxel sizes in cone-beam computed tomography (CBCT) affected surface area measurements of dehiscences and fenestrations in the mandibular anterior buccal region.MATERIALS AND METHODS: Nineteen dry human mandibles were scanned with a surface scanner (SS). (rug.nl)
  • The aim of this study is to evaluate the nature and frequency of incidental findings in large-field maxillofacial cone beam computed tomography (CBCT). (springeropen.com)
  • Cone beam computed tomography (CBCT) has been rapidly integrating into the field of dentistry to produce three-dimensional (3-D) imaging of the craniofacial complex. (springeropen.com)
  • Introduction: One of the key stages of evaluating an edentulous ridge prior to dental implant placement is the analysis of neighboring anatomical structures such as canalis sinuosus (CS) with cone-beam computed tomography (CBCT). (who.int)
  • The crucial benefit of cone-beam computed tomography (CBCT) is overcoming the limitations of conventional radiography by producing three-dimensional (3D) images that allow comprehensive evaluation of the anatomy of the chosen region [ 9 ]. (openaccessjournals.com)
  • Endodontic Applications of CBCT In: Maxillofacial Cone Beam Computed Tomography by W Scarfe, C Angelopoulos, ed. (endonet.com)
  • A CBCT is short for Cone Beam Computed Tomography. (yumasmiles.com)
  • Cone-beam computed tomography (CBCT) scans generate multiple projections that are immediately processed into 3-D images. (uofmhosting.net)
  • Introduction: The purpose of this study was to evaluate a specific orthodontic community's knowledge and understanding of Cone-Beam Computed Tomography (CBCT) technology as well as awareness of the implications of CBCT use, including risk assessment, radiation dose estimation, diagnostic utility, and issues of informed consent. (llu.edu)
  • The aim of this study was to compare the diagnostic accuracy of previously trained endodontists in the detection of artificially created periapical lesions using cone-beam computed tomography (CBCT) and digital periapical radiography (DPR). (bvsalud.org)
  • Divided into twelve chapters, the book begins with a history of Cone Beam Computed Tomography, followed by chapters on the physics and apparatus of CBCT and the need for CBCT in dentistry. (dental-books.com)
  • Global Cone Beam Computed Tomography (CBCT) market is forecasted to value over a CAGR of 10.4% from the forecast period 2022-2028. (hirakbook.com)
  • FutureWise Research has released a research report that analyses Cone Beam Computed Tomography (CBCT) Market trends in order to forecast market growth. (hirakbook.com)
  • This Cone Beam Computed Tomography (CBCT) research report includes in-depth information on the market's general overview, market segmentation, present and projected prices, growth analysis, competitive environment, and other vital insights throughout the course of the forecast year. (hirakbook.com)
  • The Cone Beam Computed Tomography (CBCT) report examines market segmentation forecasts by patient position, application, end-user, and region. (hirakbook.com)
  • FutureWise offers data on the Cone Beam Computed Tomography (CBCT) market's growth prospects in addition to SWOT analysis, notable market trends, and key informational tidbits influencing market growth during the forecast period. (hirakbook.com)
  • The Cone Beam Computed Tomography (CBCT) Market's regional overview is divided into North America, Europe, Latin America, Asia-Pacific, the Middle East and Africa, and the Rest of the World. (hirakbook.com)
  • The Competitive Landscape of the Cone Beam Computed Tomography (CBCT) study will give a thorough analysis of the industry, as well as the production graph, practical models, and revenue generated by each significant competitors mentioned. (hirakbook.com)
  • To provide a report that contains a detailed analysis of the Cone Beam Computed Tomography (CBCT) Market by patient position, application, end-user, and region. (hirakbook.com)
  • The aim of this study was to assess patients with an edentulous mandible with regards to the height and width dimensions in molar, premolar, and symphyseal regions using Cone Beam Computed Tomography (CBCT). (ijbm.org)
  • Background and Objectives: Cone beam computed tomography (CBCT) is the most efficient imaging modality for assessment of implant site. (ijmrhs.com)
  • Cone beam computed tomography (CBCT) is a developing imaging technique designed to provide relatively low-dose high-spatial-resolution visualization of high-contrast structures in the head and neck and other anatomic areas. (digitmedicine.com)
  • [4] CBCT allocates the conception of real time images in multiplanar reformation (MPR), that is, axial, coronal, sagittal, oblique, or curved image planes in comparison with thin-slice images of axial plane by conventional helical fan-beam CT. (digitmedicine.com)
  • The precise consecutive cone beam computed tomography (CBCT) scans and a CT result of biopsy are presented. (dtjournal.org)
  • Cone beam computed tomography (CBCT, also referred to as C-arm computed tomography [CT], cone beam volume CT, or flat panel CT) is a medical imaging technique of X-ray CT where the X-rays are divergent, forming a cone. (j-ips.org)
  • However, the introduction of cone beam computed tomography (CBCT) for the maxillofacial region provides a new opportunity to request for multiplanar imaging. (j-ips.org)
  • Since its introduction to the U.S. in 2001 , Cone Beam Computed Tomography (CBCT) has become a staple in dentist offices across the country. (fortworthtexasdentist.com)
  • Purpose: To evaluate the use of megavoltage cone-beam computed tomography (MV CBCT) to measure interfractional variation in lung tumor position. (mssm.edu)
  • The purpose of this study was to develop and evaluate a framework to support automated standardized testing and analysis of Cone Beam Computed Tomography (CBCT) image quality QA across multiple institutions. (elsevier.com)
  • The purpose of this study was to objectively assess dimensional alteration (blooming artefact) on dental implant using 13 cone-beam computed tomography (CBCT) devices adjusted to device-specific scanning protocols and to assess whether subjective adjustment of brightness and contrast (B&C) could alter its visualization. (springeropen.com)
  • In this paper certain type of biometric measurements has been used to identify the cone beam computed tomography (CBCT) radiograph of the subject in a fast and reliable way. (iaescore.com)
  • Cone-beam computed tomography (CBCT) was employed to verify their accuracy. (jodend.com)
  • Cone-beam computed tomography (CBCT) was used to assess the length of the teeth. (jodend.com)
  • Cone-beam computed tomography (CBCT) has been shown to precisely locate the apical constriction. (jodend.com)
  • New imaging modalities like digital radiography, computed tomography, and CBCT have become popular. (jodend.com)
  • An effective means to localize the liver cancer is to insert metal fiducial markers to or near the tumor with simultaneous imaging using cone-beam computed tomography (CBCT). (elsevier.com)
  • Cone-beam computed tomography (CBCT) is a new method to acquire three-dimensional images of the teeth in living individuals. (jfds.org)
  • In this case, a radiopaque mass was noted incidentally on an orthopantomogram in the posterior mandible and to further ascertain its operability a cone beam computed tomography (CBCT) imaging was performed which revealed the true nature and extent of the pathology. (joomr.org)
  • Objective: To investigate how cone beam computed tomography (CBCT) affects the therapeutic planning of impacted maxillary canines. (uib.no)
  • SmartCT Soft Tissue offers a Cone Beam CT (CBCT) acquisition technique augmented with step-by-step guidance, Advanced 3D visualization and measurement tools all accessible on the touch screen module at table side. (philips.dk)
  • A cone beam computed tomography (CBCT) image is taken to study the case. (who.int)
  • The aim of this study was to assess the three-dimensional soft tissue changes following anterior segmental maxillary osteotomy, in terms of magnitude and direction in correlation to hard tissue changes, using cone beam computed tomography (CBCT). (pocketdentistry.com)
  • L'examen CBCT montre une déhiscence des corticales des faces interne et externe du ramus en regarde des couronnes des troisièmes molaires. (bvsalud.org)
  • Atlas of Cone Beam Computed Tomography delivers a robust collection of cases using this advanced method of imaging for oral and maxillofacial radiology. (hochitw.com)
  • Perfect for graduate dental students and postgraduate dental students in oral and maxillofacial radiology, Atlas of Cone Beam Computed Tomography is also useful to general dentists, oral and maxillofacial radiologists, head and neck maxillofacial surgeons, head and neck radiologists, general radiologists, and ENT surgeons. (hochitw.com)
  • Specimens recovered from the boy's teeth and jaws yield clues about diet and other aspects of daily life in the 17th century.Detailed study of the remains began with the morphological and temporal study of the skull and teeth using Cone-Beam computed tomography, intraoral radiography, micro computed tomography, scanning electron microscopy, and Raman spectroscopy. (endonet.com)
  • Cone-beam computed tomography versus digital periapical radiography in the detection of artificially created periapical lesions: A pilot study of the diagnostic accuracy of endodontists using both techniques. (bvsalud.org)
  • Although combinations of plain X-ray transmission projections and panoramic radiography can be adequate in a number of clinical situations, radiographic assessment may sometimes be facilitated by multiplanar images including computed tomographs (CTs). (j-ips.org)
  • After the treatment, we examined alveolar bone loss using micro computed tomography (microCT), identified osteoclastogenesis using tartate-resistant acid phosphatase (Capture) staining, and analyzed gingival manifestation of proinflammatory molecules using real-time PCR and PCR array. (gasyblog.com)
  • Mense C, Saliba-Serre B, Ferrandez AM, Hüe O, Ruquet M, Lalys L. Cone beam computed tomography analysis of the edentulous mandibular symphysis. (ijbm.org)
  • To categorize root canal configuration according to Vertucci's classification and determine the frequency of second canal in mandibular lateral incisors of Pakistani subpopulation (Karachi based) by using Cone Beam Computed Tomography. (pafmj.org)
  • A merican Association of Endodontists and American Academy of Oral and Maxillofacial Radiology Joint Position Statement: Use of Cone-Beam Computed Tomography in Endodontics, 2015 Update . (endonet.com)
  • A few years ago, has developed a new technology in Dental Radiology, called "Beam Computed Tomography Volumetric, bringing many advantages over conventional tomography and medical, resulting in changes in relation to current diagnostic methods, helping in the correct determination of the topography structures of the jaw bone and avoid the distortions found in panoramic radiographic examination. (bvsalud.org)
  • Dental cone beam computed tomography (CT) is a special type of x-ray machine used in situations where regular dental or facial x-rays are not sufficient. (winchesteroralsurgerycenter.com)
  • Dental cone beam CT is commonly used for treatment planning of orthodontic issues. (winchesteroralsurgerycenter.com)
  • Sometimes referred to simply as a CT scan, cone-beam computed tomography is an advanced diagnostic imaging tool that uses cone-shaped X-ray beams to scan and produce three-dimensional images of a patient's internal maxillofacial structures. (northwestendo.com)
  • We read with considerable interest Dr. Uhlig and colleagues' article "Diagnostic accuracy of cone-beam breast computed tomography: a systematic review and diagnostic meta-analysis" published in the March 2019 issue of European Radiology [1]. (european-radiology.org)
  • Computed tomography modalities which use a cone or pyramid-shaped beam of radiation. (bvsalud.org)
  • External beam radiation therapy (EBRT) is one of the primary treatment modalities for patients with localized or locally advanced prostate cancer. (medscape.com)
  • Therefore, the objective of this work is to inform the reader about the computed tomography beam volume, emphasizing the development of this type of additional imaging examination in Dentistry today. (bvsalud.org)
  • Effective dose from cone beam CT examinations in dentistry. (uofmhosting.net)
  • Cone Beam Computed Tomography: A Clinician's Guide to 3D Imaging is a concise, highly illustrated manual on this increasingly important form of imaging in dentistry. (dental-books.com)
  • In 3-dimensional conformal radiotherapy (3D-CRT), the radiation beam is shaped to include the 3D anatomic configuration of the prostate and any specified adjacent tissue (including the seminal vesicles and periprostatic adventitial tissues). (medscape.com)
  • S. Manhaeve , Van Nieuwenhove, V. , and Sijbers, J. , " Performance and memory use trade-off in CPU and GPU implementations of a deformation operator for 4D-CT " , in 8th Conference on Industrial Computed Tomography, Wels, Austria , 2018. (uantwerpen.be)
  • Evaluation of relationship between preoperative bone density values derived from cone beam computed tomography and implant stability parameters: a clinical study. (osstell.com)
  • Most prosthodontists are familiar with the thin-slice images produced in the axial plane by conventional helical fan beam CTs. (j-ips.org)
  • The authors aimed to review the published evidence on cone-beam breast computed tomography (CBBCT) and summarize its diagnostic accuracy for breast lesion assessment. (european-radiology.org)
  • But by the time such researchers as the National Center for Biotechnology Information were performing their studies on the technology, most dentist's realized that Cone Beam Computed Tomography was the best and most precise option for their patients. (fortworthtexasdentist.com)
  • Images obtained with cone beam CT allow for more precise treatment planning. (winchesteroralsurgerycenter.com)
  • 3. Third, x-ray tubes necessary for cone-beam scanning are orders-of-magnitude that are less expensive than those required for conventional CT. (fortworthtexasdentist.com)
  • Unit used to deliver conventional external beam radiotherapy. (medscape.com)
  • However, cone beam CT has the advantage of lower radiation exposure compared to conventional CT. (winchesteroralsurgerycenter.com)
  • One suitable method to directly measure the stopping power is proton computed tomography (pCT). (physicamedica.com)
  • In contrast to photon beam therapy, the entrance radiation dose in proton beam therapy tends to be significantly less than the maximum energy of the clinical beam. (medscape.com)
  • Proton beams have a characteristic Bragg peak. (medscape.com)
  • The use of cone beam computed tomography in establishing the etiology of an impacted tooth. (smu.ac.za)
  • Forensic imaging of projectiles using cone-beam computed tomography. (uofmhosting.net)
  • Another modern innovation is the advent of slice-based computed tomography using a cone beam type X-ray source. (hamamatsu.com)
  • Recent studies have demonstrated the importance of this type of Computed Tomography to increase the capacity of diagnosis by imaging, with a power greater resolution and less artifacts in the image generated. (bvsalud.org)
  • Cone Beam Computed Tomography Analysis of Oropharyngeal Airway in Preadolescent Nonsyndromic Bilateral and Unilateral Cleft Lip and Palate Patients. (cdc.gov)
  • The objective of the present research was to assess the most frequent location, shape, size and individual variations in topography of the mental foramen in adults using cone-beam computed tomography. (openaccessjournals.com)
  • Age calculation using x-ray microfocus computed tomographical scanning of teeth: A pilot study. (jfds.org)
  • In fan beam scanners, an X-ray source and solid-state detector are mounted on a rotating gantry [Figure 1]a. (j-ips.org)
  • 1],[2] Cone beam radiographic technology was first introduced in the European market in 1996. (j-ips.org)
  • Age estimation using microfocus x-ray computed tomography of lower premolars. (jfds.org)
  • V. Van Nieuwenhove , Van Eyndhoven, G. , De Beenhouwer, J. , and Sijbers, J. , " Combined Estimation of Affine Movement and Reconstruction in Tomography " . (uantwerpen.be)
  • A study on image quality provided by a kilovoltage cone-beam computed tomography. (shengsci.com)
  • We conclude that the analyzed cone-beam imaging system is adequate to accurately perform IGRT within its clinical use, despite the high level of noise present in a cone beam caused by scatter. (shengsci.com)
  • Based on institutional experiences, we will highlight treatment techniques, including scalp sparing methodology and modified computed tomography (CT) simulation workflow, when concurrent TTFields and radiation are given. (medscape.com)
  • A 3D polymer gel dosimeter called RTgel-100 is contained inside the 3D printing head phantom, and irradiation was performed using a 6 MV LINAC (Varian Clinac) X-ray beam, a linear accelerator for treatment. (progmedphys.org)
  • Because most nasal cavity imaging for chronic sinusitis is currently performed with computed tomography (CT) scanning, this article concentrates on CT anatomy. (medscape.com)
  • Cone Beam Computed Tomography: A Clinician's Guide to 3D Imaging includes 180 full colour images and illustrations, further enhancing this invaluable resource for dentists. (dental-books.com)
  • Cone Beam Computed Tomography is an imaging technique in which x- rays diverge to form a cone. (dental-books.com)
  • In this work we evaluate the image quality provided by an imaging system based on a kilovoltage cone-beam CT, and explore its ability to perform IGRT and adaptive radiotherapy. (shengsci.com)
  • Cone Beam Computed Tomography is a modern radiological imaging system designed for use on the maxilla-facial skeleton . (fortworthtexasdentist.com)
  • With cone beam CT, an x-ray beam in the shape of a cone is moved around the patient to produce many images, also called views. (winchesteroralsurgerycenter.com)
  • Cone beam CT provides detailed images of the bone and is performed to evaluate diseases of the jaw, dentition, bony structures of the face, nasal cavity, and sinuses. (winchesteroralsurgerycenter.com)
  • The global cone beam computed tomography market size is expected to reach USD 1.07 billion by 2028. (reportlinker.com)
  • Computed tomography can be divided into two categories based on the acquisition of X-ray beam geometry, namely, fan beam, and cone beam. (j-ips.org)