A Method to Measure the Detective Quantum Efficiency of
... of ALARA (As Low As Reasonably Achievable) is observed for imaging procedures [3] and requires that patient equivalent dose be minimized as much as possible without compromising necessary diagnostic benefits of the examination. Although it is desireable to keep patient exposures as low as possible t ...
... of ALARA (As Low As Reasonably Achievable) is observed for imaging procedures [3] and requires that patient equivalent dose be minimized as much as possible without compromising necessary diagnostic benefits of the examination. Although it is desireable to keep patient exposures as low as possible t ...
12 Patient Immobilization and Image Guidance
... The ultimate goal of radical radiotherapy is to deliver a high radiation dose to a target while minimizing the dose to surrounding healthy tissues. In order to fulfill this aim, it is essential to consider what constitutes the target and how to ensure that the target is in the correct location for t ...
... The ultimate goal of radical radiotherapy is to deliver a high radiation dose to a target while minimizing the dose to surrounding healthy tissues. In order to fulfill this aim, it is essential to consider what constitutes the target and how to ensure that the target is in the correct location for t ...
X-ray Performance Evaluation of the Dexela CMOS APS X
... of optical photons can be lost in the demagnification stage. Moreover, CCDs are serial devices, i.e., the entire signal needs to pass through the same sense node before being read out. This leads to high read noise at high frame rates, limiting the use of CCDs in applications such as computed tomogr ...
... of optical photons can be lost in the demagnification stage. Moreover, CCDs are serial devices, i.e., the entire signal needs to pass through the same sense node before being read out. This leads to high read noise at high frame rates, limiting the use of CCDs in applications such as computed tomogr ...
Radiology
... • Radiologic supervision and interpretation code from the radiology section. Radiology ...
... • Radiologic supervision and interpretation code from the radiology section. Radiology ...
AAPM Medical Physics Practice Guideline 2.a: Commissioning and
... techniques, as described in each document. Reproduction or modification of the published practice guidelines and technical standards by those entities not providing these services is not authorized. ...
... techniques, as described in each document. Reproduction or modification of the published practice guidelines and technical standards by those entities not providing these services is not authorized. ...
Developing a quality control program for digital mammography
... of the acquisition process. Unlike the case in film mammography, the brightness and contrast of digital images can be adjusted independent of x-ray exposure while they are being viewed on a high-resolution monitor. Image processing can be used to increase sharpness and alter the display characterist ...
... of the acquisition process. Unlike the case in film mammography, the brightness and contrast of digital images can be adjusted independent of x-ray exposure while they are being viewed on a high-resolution monitor. Image processing can be used to increase sharpness and alter the display characterist ...
3-D Image Postprocessing Educational Framework
... competent performance of radiologic imaging and total quality management. Levels of competency and outcomes measurement ensure the well-being of the patient preparatory to, during and following the radiologic procedure. Digital Image Acquisition and Display Content is designed to impart an understan ...
... competent performance of radiologic imaging and total quality management. Levels of competency and outcomes measurement ensure the well-being of the patient preparatory to, during and following the radiologic procedure. Digital Image Acquisition and Display Content is designed to impart an understan ...
Acceptance Testing and Quality Control of Dental Imaging
... dental x-ray facilities is instrumental in ensuring that patients are not receiving excessive radiation during their examination. A QC program also ensures that the dental x-ray imaging equipment is working properly, as exemplified by scientific and technical testing to confirm that the machine is p ...
... dental x-ray facilities is instrumental in ensuring that patients are not receiving excessive radiation during their examination. A QC program also ensures that the dental x-ray imaging equipment is working properly, as exemplified by scientific and technical testing to confirm that the machine is p ...
Advanced Neuroimaging with Computed Tomography Scanning
... given two arbitrary selected basic materials, MD determines how much of each material would be needed to produce the observed measurements at low (65 Kev) energy and high (140 Kev) energy. These last two values correspond to common fixed DECT parameters of energy. ...
... given two arbitrary selected basic materials, MD determines how much of each material would be needed to produce the observed measurements at low (65 Kev) energy and high (140 Kev) energy. These last two values correspond to common fixed DECT parameters of energy. ...
Multi Slice Spiral CT Scanner
... CT (computed tomography), sometimes called CAT scan, uses special x-ray equipment to obtain image data from different angles around the body and then uses computer processing of the information to show a cross-section of body tissues and organs. CT imaging is particularly useful because it can show ...
... CT (computed tomography), sometimes called CAT scan, uses special x-ray equipment to obtain image data from different angles around the body and then uses computer processing of the information to show a cross-section of body tissues and organs. CT imaging is particularly useful because it can show ...
Automatic registration of portal images and volumetric - CAMP-TUM
... radio-opaque markers have also been used to recover patient setup error in 3D, which includes out-of-plane rotations (Lam et al., 1993). In Lavallee and Szeliski (1995), the authors describe a method for recovering the pose based on matching projected contours of some 3D shapes. Feature-based method ...
... radio-opaque markers have also been used to recover patient setup error in 3D, which includes out-of-plane rotations (Lam et al., 1993). In Lavallee and Szeliski (1995), the authors describe a method for recovering the pose based on matching projected contours of some 3D shapes. Feature-based method ...
1 Introduction Technological developments in digital imaging
... principle should always be kept in mind. Radiographers must constantly bear in mind this important principle because unfortunately digital radiology systems allow examinations to be performed over a wide range of exposure factors, and therefore patient doses. X-ray beam quality and quantity is depen ...
... principle should always be kept in mind. Radiographers must constantly bear in mind this important principle because unfortunately digital radiology systems allow examinations to be performed over a wide range of exposure factors, and therefore patient doses. X-ray beam quality and quantity is depen ...
Wake Radiology Expands Pediatric Imaging
... Pediatric radiologists also can prevent a misdiagnosis, he points out. “There is a condition, pyloric stenosis, in which the pyloric muscle in the stomach closes down. The classic patient is about a month old, and surgery is necessary to open it up. Before Dr. Douglas arrived in Raleigh, an adult ra ...
... Pediatric radiologists also can prevent a misdiagnosis, he points out. “There is a condition, pyloric stenosis, in which the pyloric muscle in the stomach closes down. The classic patient is about a month old, and surgery is necessary to open it up. Before Dr. Douglas arrived in Raleigh, an adult ra ...
Professional capabilities for medical radiation practice
... How your submission will be treated Submissions will generally be published unless you request otherwise. The National Board publishes submissions on its website to encourage discussion and inform the community and stakeholders. However, the National Board will not publish on its website, or make a ...
... How your submission will be treated Submissions will generally be published unless you request otherwise. The National Board publishes submissions on its website to encourage discussion and inform the community and stakeholders. However, the National Board will not publish on its website, or make a ...
the tuffest stuff ct registry review workbook #1
... arrived at promotes a learning experience that I describe as “affirmation.” I believe the crossword puzzle technique promotes term retention in a valuable way. Not only will correct answers be chosen but incorrect answers will more readily be rejected from selection attributable to each students imp ...
... arrived at promotes a learning experience that I describe as “affirmation.” I believe the crossword puzzle technique promotes term retention in a valuable way. Not only will correct answers be chosen but incorrect answers will more readily be rejected from selection attributable to each students imp ...
Professional capabilities for medical radiation practice
... How your submission will be treated Submissions will generally be published unless you request otherwise. The National Board publishes submissions on its website to encourage discussion and inform the community and stakeholders. However, the National Board will not publish on its website, or make a ...
... How your submission will be treated Submissions will generally be published unless you request otherwise. The National Board publishes submissions on its website to encourage discussion and inform the community and stakeholders. However, the National Board will not publish on its website, or make a ...
x-ray safety manual - Winnipeg Regional Health Authority
... A tiered system of safety responsibility and reporting has been developed within WRHA from staff to executives. Individual workers have the first level of safety responsibility, followed by named persons in designated successive technical and management levels. The Medical Director of Diagnostic Ima ...
... A tiered system of safety responsibility and reporting has been developed within WRHA from staff to executives. Individual workers have the first level of safety responsibility, followed by named persons in designated successive technical and management levels. The Medical Director of Diagnostic Ima ...
Image Analysis and Computer Vision in Medicine
... pipeline, composed of the following steps: modelling three-dimensional objects in their own coordinates system, composing a scene by instancing these objects at various locations within a common reference frame, lighting and shading the scene, projecting visible parts onto the display. ...
... pipeline, composed of the following steps: modelling three-dimensional objects in their own coordinates system, composing a scene by instancing these objects at various locations within a common reference frame, lighting and shading the scene, projecting visible parts onto the display. ...
Virtual Monochromatic Imaging in Dual-energy CT
... Since the introduction of dual-source CT scanners and scanners capable of fast tube potential (kV) switching, dual-energy CT has been applied in many clinical areas, including automatic bone removal, stone composition characterization, virtual non-contrast imaging, diagnosis of gout, and assessment ...
... Since the introduction of dual-source CT scanners and scanners capable of fast tube potential (kV) switching, dual-energy CT has been applied in many clinical areas, including automatic bone removal, stone composition characterization, virtual non-contrast imaging, diagnosis of gout, and assessment ...
General X-ray QA and QC Guideline Master_FINAL
... Please note: Although many practices will not be printing films for primary reporting, it is still important to make sure that printed images are of a relatively high standard if being sent as the medical record. It is acknowledged that sites will no longer own a densitometer and for this reason, a ...
... Please note: Although many practices will not be printing films for primary reporting, it is still important to make sure that printed images are of a relatively high standard if being sent as the medical record. It is acknowledged that sites will no longer own a densitometer and for this reason, a ...
Radiological Protection in Paediatric Diagnostic and Interventional
... (7) Therefore, it is important for all patients, and particularly for infants and children, that all ...
... (7) Therefore, it is important for all patients, and particularly for infants and children, that all ...
Automatic CT Image Segmentation of the Lungs with Region
... with the foreground pixels and the sample mean of the gray values associated with the background pixels are computed, and a new threshold value is determined as the average of these two sample means. The process is repeated until the threshold value does not change any more. Optimal thresholding is ...
... with the foreground pixels and the sample mean of the gray values associated with the background pixels are computed, and a new threshold value is determined as the average of these two sample means. The process is repeated until the threshold value does not change any more. Optimal thresholding is ...
Abdominal radiography - American College of Radiology
... perform fluoroscopic procedures in light of the standard’s stated purpose that ACR standards are educational tools and not intended to establish a legal standard of care. See also, Stanley v. McCarver, 63 P.3d 1076 (Ariz. App. 2003) where in a concurring opinion the Court stated that “published stan ...
... perform fluoroscopic procedures in light of the standard’s stated purpose that ACR standards are educational tools and not intended to establish a legal standard of care. See also, Stanley v. McCarver, 63 P.3d 1076 (Ariz. App. 2003) where in a concurring opinion the Court stated that “published stan ...
Fluoroscopy
Fluoroscopy /flɔrˈɒskəpi/ is an imaging technique that uses X-rays to obtain real-time moving images of the interior of an object. In its primary application of medical imaging, a fluoroscope /ˈflɔrɵˌskoʊp/ allows a physician to see the internal structure and function of a patient, so that the pumping action of the heart or the motion of swallowing, for example, can be watched. This is useful for both diagnosis and therapy and occurs in general radiology, interventional radiology, and image-guided surgery. In its simplest form, a fluoroscope consists of an X-ray source and a fluorescent screen, between which a patient is placed. However, since the 1950s most fluoroscopes have included X-ray image intensifiers and cameras as well, to improve the image's visibility and make it available on a remote display screen. For many decades fluoroscopy tended to produce live pictures that were not recorded, but since the 1960s, as technology improved, recording and playback became the norm.Fluoroscopy is similar to radiography and X-ray computed tomography (X-ray CT) in that it generates images using X-rays. The original difference was that radiography fixed still images on film whereas fluoroscopy provided live moving pictures that were not stored. However, today radiography, CT, and fluoroscopy are all digital imaging modes with image analysis software and data storage and retrieval. The use of X-rays, a form of ionizing radiation, requires the potential risks from a procedure to be carefully balanced with the benefits of the procedure to the patient. Because the patient must be exposed to a continuous source of x-rays instead of a momentary pulse, a fluoroscopy procedure generally subjects a patient to a higher absorbed dose of radiation than an ordinary (still) radiograph. Much research has been directed toward reducing radiation exposure, and recent advances in fluoroscopy technology such as digital image processing and flat panel detectors, have resulted in much lower radiation doses than former procedures.The type of fluoroscopy used in airport security (to check for hidden weapons or bombs) uses lower doses of radiation than medical fluoroscopy. It was formerly also used in retail stores in the form of shoe-fitting fluoroscopes, but such use was discontinued because it is no longer considered acceptable to use radiation exposure, however small the dose, for nonessential purposes. Only important applications such as health care, bodily safety, food safety, nondestructive testing, and scientific research meet the risk-benefit threshold for use. The reason for higher doses in medical applications is that they are more demanding about tissue contrast, and for the same reason they sometimes require contrast media.