Flash Speed. Lowest Dose.
... Bringing Dual Energy into clinical routine Dual Source Dual Energy offers a variety of clinical applications – from research to clinical routine usage. For example, the SOMATOM Definition Flash can obtain monoenergetic images. They are similar to images acquired with a synchrotron X-ray beam of sin ...
... Bringing Dual Energy into clinical routine Dual Source Dual Energy offers a variety of clinical applications – from research to clinical routine usage. For example, the SOMATOM Definition Flash can obtain monoenergetic images. They are similar to images acquired with a synchrotron X-ray beam of sin ...
Guideline for Radiation Safety in Interventional Cardiology - J
... Vol. 30 No. 2, 2000, with permission from Elsevier Inc. ...
... Vol. 30 No. 2, 2000, with permission from Elsevier Inc. ...
Lecture 15 QA programs Fri - gnssn
... • Especially important in digital imaging, where repeats can easily by “hidden” or not recorded ...
... • Especially important in digital imaging, where repeats can easily by “hidden” or not recorded ...
image gently campaign - Medical Physics International Journal
... different between adult and pediatric populations (i.e. ultrasonography is much more frequently employed in children with possible appendicitis versus the overwhelming use of CT in the adult population in the United States). These differences resonate in the introduction to the CT campaign on the IG ...
... different between adult and pediatric populations (i.e. ultrasonography is much more frequently employed in children with possible appendicitis versus the overwhelming use of CT in the adult population in the United States). These differences resonate in the introduction to the CT campaign on the IG ...
Digital radiography with large-area flat
... years. The latest generation of storage phosphor plates has detective quantum efficiencies (DQE, indicating the efficiency of a detector system in detecting incident X-ray quantas; see below) comparable with that of conventional screen-film systems (SFS) [3]. The spatial resolution of SPR is of 2.5 ...
... years. The latest generation of storage phosphor plates has detective quantum efficiencies (DQE, indicating the efficiency of a detector system in detecting incident X-ray quantas; see below) comparable with that of conventional screen-film systems (SFS) [3]. The spatial resolution of SPR is of 2.5 ...
File Ref.No.38933/GA - IV - J2/2013/CU UNIVERSITY OF CALICUT
... A candidate who has failed in the I semester shall be promoted to II and III semester but will not be allowed to attend the IV semester classes until he/she cleared the 1 st semester subjects. Discontinuation: No discontinuation is allowed in normal basis. However if a student has to discontinue ...
... A candidate who has failed in the I semester shall be promoted to II and III semester but will not be allowed to attend the IV semester classes until he/she cleared the 1 st semester subjects. Discontinuation: No discontinuation is allowed in normal basis. However if a student has to discontinue ...
Policy Statement on Thyroid Shielding During Diagnostic Medical
... processes, is among the most susceptible sites to radiation-induced carcinogenesis. Risks of radiation exposure are thus of special concern to the American Thyroid Association (ATA). The risk of thyroid cancer arising from radiation exposure is strongly dependent on age at exposure. This risk is gre ...
... processes, is among the most susceptible sites to radiation-induced carcinogenesis. Risks of radiation exposure are thus of special concern to the American Thyroid Association (ATA). The risk of thyroid cancer arising from radiation exposure is strongly dependent on age at exposure. This risk is gre ...
IAEA Training Material on Radiation Protection in - RPOP
... • Computed Tomography (CT) was introduced into clinical practice in 1972 and revolutionized X ray imaging by providing high quality images which reproduced transverse cross sections of the body. • Tissues are therefore not superimposed on the image as they are in conventional projections • The techn ...
... • Computed Tomography (CT) was introduced into clinical practice in 1972 and revolutionized X ray imaging by providing high quality images which reproduced transverse cross sections of the body. • Tissues are therefore not superimposed on the image as they are in conventional projections • The techn ...
Adult patient doses in interventional neuroradiology
... doses in excess of 6 Gy.6 At lower doses, signs of erythema would be fleeting and faint, which would make detection difficult. Additional factors which could affect the threshold radiation doses for the induction of deterministic effects include the anatomic location and size of the irradiated regio ...
... doses in excess of 6 Gy.6 At lower doses, signs of erythema would be fleeting and faint, which would make detection difficult. Additional factors which could affect the threshold radiation doses for the induction of deterministic effects include the anatomic location and size of the irradiated regio ...
Standards for Chest Radiography
... A standard chest examination should include an erect posterior-anterior (PA) and left lateral projection made in full inspiration (total lung capacity). The examination may be modified by the physician as dictated by the clinical circumstances or the condition of the patient. The chest radiograph sh ...
... A standard chest examination should include an erect posterior-anterior (PA) and left lateral projection made in full inspiration (total lung capacity). The examination may be modified by the physician as dictated by the clinical circumstances or the condition of the patient. The chest radiograph sh ...
Full Text
... patients undergoing CT examinations (1) and also because the number of CT examinations in the United States has increased by about 10% each year over the past decade. In 1980, radiation exposure from medical procedures accounted for about 15% of the total radiation received on average by U.S. reside ...
... patients undergoing CT examinations (1) and also because the number of CT examinations in the United States has increased by about 10% each year over the past decade. In 1980, radiation exposure from medical procedures accounted for about 15% of the total radiation received on average by U.S. reside ...
Photon Counting X-ray Detector Systems
... imaging detector systems. “Colour” X-ray imaging opens up new perspectives within the fields of medical X-ray diagnosis and also in industrial X-ray quality control. The difference in absorption for different “colours” can be used to discern materials in the object. For instance, this information mi ...
... imaging detector systems. “Colour” X-ray imaging opens up new perspectives within the fields of medical X-ray diagnosis and also in industrial X-ray quality control. The difference in absorption for different “colours” can be used to discern materials in the object. For instance, this information mi ...
Document
... The study is based on estimate of CTDI and DLP values for patients’ dose optimization procedures. Technical parameters were obtained for three groups of randomly selected patients undergoing abdominal CT examinations of 1320 patients of age 20-80 years. The measured values were obtained on image dat ...
... The study is based on estimate of CTDI and DLP values for patients’ dose optimization procedures. Technical parameters were obtained for three groups of randomly selected patients undergoing abdominal CT examinations of 1320 patients of age 20-80 years. The measured values were obtained on image dat ...
RADIATION PROTECTION IN DIAGNOSTIC RADIOLOGY
... • Computed Tomography (CT) was introduced into clinical practice in 1972 and revolutionized X Ray imaging by providing high quality images which reproduced transverse cross sections of the body. • Tissues are not superimposed on the image as they are in conventional projections • The CT provides imp ...
... • Computed Tomography (CT) was introduced into clinical practice in 1972 and revolutionized X Ray imaging by providing high quality images which reproduced transverse cross sections of the body. • Tissues are not superimposed on the image as they are in conventional projections • The CT provides imp ...
(from the distal).
... distally, the two canals, which are initially superimposed (premolar periapical above) will separate. The lingual canal (red arrow) will follow the tube head movement and the buccal canal (blue arrow) will move in the opposite direction, as seen on the canine film. ...
... distally, the two canals, which are initially superimposed (premolar periapical above) will separate. The lingual canal (red arrow) will follow the tube head movement and the buccal canal (blue arrow) will move in the opposite direction, as seen on the canine film. ...
Philips SPECT/CT Systems
... Image Quality and Acquisition Speed Astonish provides constant image quality with wide range of count statistics 5 Observers: A relative image quality (RIQ) score with respect to a standard image (64x64x64 matrix, clinical counts, FBP reconstruction) was assigned to each image by each observer (3: ...
... Image Quality and Acquisition Speed Astonish provides constant image quality with wide range of count statistics 5 Observers: A relative image quality (RIQ) score with respect to a standard image (64x64x64 matrix, clinical counts, FBP reconstruction) was assigned to each image by each observer (3: ...
Optimization of image acquisition techniques for dual
... lung nodules in DE soft-tissue images. Three phantom thicknesses corresponding to “thin,” “average,” and “thick” adult chest thicknesses were investigated, with total radiation dose equivalent to that of a single chest radiograph. Novel aspects of the work reported below include: 共i.兲 identification ...
... lung nodules in DE soft-tissue images. Three phantom thicknesses corresponding to “thin,” “average,” and “thick” adult chest thicknesses were investigated, with total radiation dose equivalent to that of a single chest radiograph. Novel aspects of the work reported below include: 共i.兲 identification ...
Wake Radiology Expands Pediatric Imaging
... x-rays, CT scans, nuclear medicine exams, and fluoroscopic studies. These images can be enormously useful to your child’s doctors to help diagnose medical or surgical problems. There is some risk, however, associated with this radiation. (Ultrasound and MRI do not use ionizing radiation.) Every day, ...
... x-rays, CT scans, nuclear medicine exams, and fluoroscopic studies. These images can be enormously useful to your child’s doctors to help diagnose medical or surgical problems. There is some risk, however, associated with this radiation. (Ultrasound and MRI do not use ionizing radiation.) Every day, ...
academic program for master of science degree in medical
... notably in radiation therapy. This situation may eventually lead to “certification” or “licensure.” Without excessive elaboration, formal academic training can never hope to provide nor is it necessarily the proper environment for clinical training. Every attempt is made to provide a foundation ...
... notably in radiation therapy. This situation may eventually lead to “certification” or “licensure.” Without excessive elaboration, formal academic training can never hope to provide nor is it necessarily the proper environment for clinical training. Every attempt is made to provide a foundation ...
Dose issues on multi-slice CT scanners
... parallel slices in a single rotation, were first introduced in 1998. Since then, scanners with 6, 8, 10 and 16 slice capabilities have become available and have made a marked impact on the role of CT in the diagnostic radiology department. Most recently 32, 40 and 64 slice scanners have been announc ...
... parallel slices in a single rotation, were first introduced in 1998. Since then, scanners with 6, 8, 10 and 16 slice capabilities have become available and have made a marked impact on the role of CT in the diagnostic radiology department. Most recently 32, 40 and 64 slice scanners have been announc ...
The following scientific article was officially published in
... de Kraats et al. [34] registered MRI to X-ray data using fiducials manually placed on cadaveric data. The placement of fiducials is not realistic in real patient data. Tomazevic et al. [109] rigidly registered 2D X-ray images to CT and MRI data of lumbar vertebrae obtained from a cadaver. They used ...
... de Kraats et al. [34] registered MRI to X-ray data using fiducials manually placed on cadaveric data. The placement of fiducials is not realistic in real patient data. Tomazevic et al. [109] rigidly registered 2D X-ray images to CT and MRI data of lumbar vertebrae obtained from a cadaver. They used ...
Slides to IAEA Radiation Oncology Physics Handbook
... Typically a CBCT can acquire a full field of view (FOV) that covers the whole head • although acquisitions that are restricted to the mandible with as little as 10% of full FOV are possible. ...
... Typically a CBCT can acquire a full field of view (FOV) that covers the whole head • although acquisitions that are restricted to the mandible with as little as 10% of full FOV are possible. ...
anti scatter grid
... A nearly constant potential waveform with a ripple not greater than that produced by a 6pulse rectification system The tube voltage range should be 25 - 35 kV The tube current should be at least 100 mA on broad focus and 50 mA on fine focus. The range of tube current exposure time product (mAs) shou ...
... A nearly constant potential waveform with a ripple not greater than that produced by a 6pulse rectification system The tube voltage range should be 25 - 35 kV The tube current should be at least 100 mA on broad focus and 50 mA on fine focus. The range of tube current exposure time product (mAs) shou ...
Dose Reduction Strategies for SPECT/CT and PET/CT
... (ie, from the anteroposterior direction to the lateral direction, and from the shoulders to the abdomen). The operator must still indicate the desired level of image quality by one of the methods described earlier. This is the most comprehensive approach to CT dose reduction because the x-ray dose i ...
... (ie, from the anteroposterior direction to the lateral direction, and from the shoulders to the abdomen). The operator must still indicate the desired level of image quality by one of the methods described earlier. This is the most comprehensive approach to CT dose reduction because the x-ray dose i ...
X-ray
X-radiation (composed of X-rays) is a form of electromagnetic radiation. Most X-rays have a wavelength ranging from 0.01 to 10 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz (3×1016 Hz to 3×1019 Hz) and energies in the range 100 eV to 100 keV. X-ray wavelengths are shorter than those of UV rays and typically longer than those of gamma rays. In many languages, X-radiation is referred to with terms meaning Röntgen radiation, after Wilhelm Röntgen, who is usually credited as its discoverer, and who had named it X-radiation to signify an unknown type of radiation. Spelling of X-ray(s) in the English language includes the variants x-ray(s), xray(s) and X ray(s).X-rays with photon energies above 5–10 keV (below 0.2–0.1 nm wavelength) are called hard X-rays, while those with lower energy are called soft X-rays. Due to their penetrating ability, hard X-rays are widely used to image the inside of objects, e.g., in medical radiography and airport security. As a result, the term X-ray is metonymically used to refer to a radiographic image produced using this method, in addition to the method itself. Since the wavelengths of hard X-rays are similar to the size of atoms they are also useful for determining crystal structures by X-ray crystallography. By contrast, soft X-rays are easily absorbed in air and the attenuation length of 600 eV (~2 nm) X-rays in water is less than 1 micrometer.There is no universal consensus for a definition distinguishing between X-rays and gamma rays. One common practice is to distinguish between the two types of radiation based on their source: X-rays are emitted by electrons, while gamma rays are emitted by the atomic nucleus. This definition has several problems; other processes also can generate these high energy photons, or sometimes the method of generation is not known. One common alternative is to distinguish X- and gamma radiation on the basis of wavelength (or equivalently, frequency or photon energy), with radiation shorter than some arbitrary wavelength, such as 10−11 m (0.1 Å), defined as gamma radiation.This criterion assigns a photon to an unambiguous category, but is only possible if wavelength is known. (Some measurement techniques do not distinguish between detected wavelengths.) However, these two definitions often coincide since the electromagnetic radiation emitted by X-ray tubes generally has a longer wavelength and lower photon energy than the radiation emitted by radioactive nuclei.Occasionally, one term or the other is used in specific contexts due to historical precedent, based on measurement (detection) technique, or based on their intended use rather than their wavelength or source.Thus, gamma-rays generated for medical and industrial uses, for example radiotherapy, in the ranges of 6–20 MeV, can in this context also be referred to as X-rays.