Comparison of Auto-moving Table Contrast-enhanced 3
... The only issue with 3-D MRA was that 5 patients complained of leg soreness after 1 hour of MR examination. ...
... The only issue with 3-D MRA was that 5 patients complained of leg soreness after 1 hour of MR examination. ...
Cone-beam computed tomography with a flat
... A system for cone-beam computed tomography 共CBCT兲 based on a flat-panel imager 共FPI兲 is used to examine the magnitude and effects of x-ray scatter in FPI-CBCT volume reconstructions. The system is being developed for application in image-guided therapies and has previously demonstrated spatial resol ...
... A system for cone-beam computed tomography 共CBCT兲 based on a flat-panel imager 共FPI兲 is used to examine the magnitude and effects of x-ray scatter in FPI-CBCT volume reconstructions. The system is being developed for application in image-guided therapies and has previously demonstrated spatial resol ...
ANSWERS Chapter 1 1. Define digital radiography. Answer: Term
... latches, warped screens resulting from excessive moisture, and foreign matter under the screen. 10. Define screen lag and its cause. Answer: Intensifying screens may luminesce in two ways, fluorescence or phosphorescence. Fluorescence refers to the ability of phosphors to emit visible light only whi ...
... latches, warped screens resulting from excessive moisture, and foreign matter under the screen. 10. Define screen lag and its cause. Answer: Intensifying screens may luminesce in two ways, fluorescence or phosphorescence. Fluorescence refers to the ability of phosphors to emit visible light only whi ...
Magnetic resonance imaging- based radiation therapy
... This work studied the conversion of the magnetic resonance images to synthetic heterogeneous computed tomography (CT) images, so-called pseudo-CT images. The study focused on updating and modifying a previously introduced conversion technique. Ultimate objective of this study was to verify the techn ...
... This work studied the conversion of the magnetic resonance images to synthetic heterogeneous computed tomography (CT) images, so-called pseudo-CT images. The study focused on updating and modifying a previously introduced conversion technique. Ultimate objective of this study was to verify the techn ...
Recent Advances in X-ray Phase Imaging - X
... a microscope, but no X-ray transmission lenses are available, except for a compound X-ray refractive lens that was reported recently,8) because the refractive indices of all materials are close to unity, as mentioned above. Focusing mirrors and Fresnel zone plates are mainly used for X-ray microscop ...
... a microscope, but no X-ray transmission lenses are available, except for a compound X-ray refractive lens that was reported recently,8) because the refractive indices of all materials are close to unity, as mentioned above. Focusing mirrors and Fresnel zone plates are mainly used for X-ray microscop ...
Improved Detection and Delineation of Head and Neck Lesions with
... To compare conventional and fat suppression MR imaging in their ability to detect head and neck lesions, we prospectively studied 17 patients with head and neck tumors and one normal volunteer. Five patients had benign tumors (one mixed cell tumor, one hemangioma, one lipoma, and two plexiform neuro ...
... To compare conventional and fat suppression MR imaging in their ability to detect head and neck lesions, we prospectively studied 17 patients with head and neck tumors and one normal volunteer. Five patients had benign tumors (one mixed cell tumor, one hemangioma, one lipoma, and two plexiform neuro ...
R42 - American College of Radiology
... capability for image display on computer monitors. This practice parameter in digital mammography does not pertain to computed tomography (CT) mammography. This practice parameter is specific to 2-dimensional (2D) digital mammography since the vast majority of digital mammography performed in the Un ...
... capability for image display on computer monitors. This practice parameter in digital mammography does not pertain to computed tomography (CT) mammography. This practice parameter is specific to 2-dimensional (2D) digital mammography since the vast majority of digital mammography performed in the Un ...
View - OhioLINK ETD
... physical characteristics of emission tomography, the Poisson nature of photons, and many such other factors leading to better image reconstruction. We will concentrate on one of these iterative reconstruction techniques called Maximum Likelihood Expectation Maximum (ML-EM) reconstruction. The mathem ...
... physical characteristics of emission tomography, the Poisson nature of photons, and many such other factors leading to better image reconstruction. We will concentrate on one of these iterative reconstruction techniques called Maximum Likelihood Expectation Maximum (ML-EM) reconstruction. The mathem ...
III. Profile Details - QIBA Wiki
... available scan modes, the total collimation needs to be dropped to 16mm rather than 20mm) A 4cm/sec threshold is needed since it would likely forestall a lot of potential breath hold issues. ...
... available scan modes, the total collimation needs to be dropped to 16mm rather than 20mm) A 4cm/sec threshold is needed since it would likely forestall a lot of potential breath hold issues. ...
and c. - German Cancer Research Center
... Standard deconvolution technique (often used in CT literature). ...
... Standard deconvolution technique (often used in CT literature). ...
The Measurement, Reporting, and Management of
... technology, but also in data acquisition systems (DAS), x-ray tube design and other subsystems. One illustration of this is that while MDCT scanners have multiple rows of detectors, the data collected from multiple rows can be combined as though they were collected from one detector. To describe thi ...
... technology, but also in data acquisition systems (DAS), x-ray tube design and other subsystems. One illustration of this is that while MDCT scanners have multiple rows of detectors, the data collected from multiple rows can be combined as though they were collected from one detector. To describe thi ...
QIBA proffered UPICT protocol for solid tumors - QIBA Wiki
... This QIBA proffered imaging protocol is limited to measurements based on CT scans. Alternative imaging technologies may be used as indicators of disease progression only. For example, in a subject with lung cancer who is being followed with CT scans of the body, if an unscheduled, off-protocol MRI s ...
... This QIBA proffered imaging protocol is limited to measurements based on CT scans. Alternative imaging technologies may be used as indicators of disease progression only. For example, in a subject with lung cancer who is being followed with CT scans of the body, if an unscheduled, off-protocol MRI s ...
ARTICLE 23. RADIOLOGIC TECHNOLOGISTS. § 30
... (5) Determination of imaging exposure factors, setting of factors on control panel, and application of medical imaging exposures; (6) Application of radiation protection principles to minimize radiation exposure to patient, self, and others; (7) Evaluation of images for technical quality; (8) Perfor ...
... (5) Determination of imaging exposure factors, setting of factors on control panel, and application of medical imaging exposures; (6) Application of radiation protection principles to minimize radiation exposure to patient, self, and others; (7) Evaluation of images for technical quality; (8) Perfor ...
AXIOM Innovations
... Colombian girl, will undergo an angioplasty at Bogotá’s Fundación Cardioinfantil hospital that will save her life. Pale, underweight and short of breath, Nelsy was screened in late May by the clinic’s outreach team in the southwestern city of Pasto and found to have persistent ductus arteriosis, a c ...
... Colombian girl, will undergo an angioplasty at Bogotá’s Fundación Cardioinfantil hospital that will save her life. Pale, underweight and short of breath, Nelsy was screened in late May by the clinic’s outreach team in the southwestern city of Pasto and found to have persistent ductus arteriosis, a c ...
Effect of x-ray energy dispersion in digital subtraction imaging at the
... configuration.10,14 The strip pitch and length are 100 m and 10 mm, respectively; the detector thickness is 300 m, resulting 共in the case of edge-on irradiation兲 in a pixel size of 100⫻ 300 m2 and an active length of 10 mm. The thickness of the inactive region 共guard rings+ detector edges兲 upstre ...
... configuration.10,14 The strip pitch and length are 100 m and 10 mm, respectively; the detector thickness is 300 m, resulting 共in the case of edge-on irradiation兲 in a pixel size of 100⫻ 300 m2 and an active length of 10 mm. The thickness of the inactive region 共guard rings+ detector edges兲 upstre ...
PRG 2009
... called Gendex in 1983. In 1991, Gendex purchased the European business of Philips dental X-ray operation, further strengthening the company's position as a world leader in dental X-ray. In June 1993 Gendex merged with ...
... called Gendex in 1983. In 1991, Gendex purchased the European business of Philips dental X-ray operation, further strengthening the company's position as a world leader in dental X-ray. In June 1993 Gendex merged with ...
Impact of New DICOM Objects on Handling Large Data Sets (PACS
... “versions” of HTML poorly controlled layout not constrained by HTML availability of proprietary extensions (plug-ins, applets) e.g., “this page only for IE version 5.0” ...
... “versions” of HTML poorly controlled layout not constrained by HTML availability of proprietary extensions (plug-ins, applets) e.g., “this page only for IE version 5.0” ...
evaluation of image-guidance protocols in the treatment of head and
... patient variation of the systematic error is larger but generally decreases with increasing imaging frequency. This means that more frequent imaging reduces the systematic errors in the nonimage-guided treatments. In contrast to systematic errors, random errors are more problematic. Random errors ca ...
... patient variation of the systematic error is larger but generally decreases with increasing imaging frequency. This means that more frequent imaging reduces the systematic errors in the nonimage-guided treatments. In contrast to systematic errors, random errors are more problematic. Random errors ca ...
CLARET: A Fast Deformable Registration Method Applied to Lung
... complexity in computing the image Jacobian, and they also require a well-defined convex metric to guarantee that the scheme reaches the global optimum. Chou et al. [5] instead used a novel regression-based matching scheme in this 3D/2D framework for patient re-positioning in head-and-neck IGRT. Refer ...
... complexity in computing the image Jacobian, and they also require a well-defined convex metric to guarantee that the scheme reaches the global optimum. Chou et al. [5] instead used a novel regression-based matching scheme in this 3D/2D framework for patient re-positioning in head-and-neck IGRT. Refer ...
(OPEIR) Performance Measure Set
... was to identify and define quality measures toward improving the quality of care for patients undergoing high dose radiation imaging studies and for use in Physician Quality Improvement (PQI) projects for implementation into Maintenance of Certification® (MOC) Part IV programs. The measures in this ...
... was to identify and define quality measures toward improving the quality of care for patients undergoing high dose radiation imaging studies and for use in Physician Quality Improvement (PQI) projects for implementation into Maintenance of Certification® (MOC) Part IV programs. The measures in this ...
AAPM Imaging Physics Curricula Subcommittee
... mammography, projection radiography, fluoroscopy, CT, and various nuclear medicine radioactive isotopes. 2. Understand how image quality and patient dose are affected by these interactions. 3. Understand which x-ray beam energies are to be used with intravenous iodine and oral barium contrast agents ...
... mammography, projection radiography, fluoroscopy, CT, and various nuclear medicine radioactive isotopes. 2. Understand how image quality and patient dose are affected by these interactions. 3. Understand which x-ray beam energies are to be used with intravenous iodine and oral barium contrast agents ...
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.