Conference Category
... attenuating calvarial landmark within the image or any adjacent image. • Multiple maintenance efforts were attempted, but the image artifact persisted. Finally, it was determined that the artifact was most prominent at certain gantry angles, and when the head was located near the base of the CT head ...
... attenuating calvarial landmark within the image or any adjacent image. • Multiple maintenance efforts were attempted, but the image artifact persisted. Finally, it was determined that the artifact was most prominent at certain gantry angles, and when the head was located near the base of the CT head ...
Experimental article – Reducing effective dose to a paediatric
... altering exposure factors and using additional filtration. Filtration works by hardening the beam, meaning more useful X-rays reach the image receptor and the low energy X-rays are filtered out without reducing image quality5. Using copper filtration has been shown to be more efficient and filter mo ...
... altering exposure factors and using additional filtration. Filtration works by hardening the beam, meaning more useful X-rays reach the image receptor and the low energy X-rays are filtered out without reducing image quality5. Using copper filtration has been shown to be more efficient and filter mo ...
AIDR 3D - Toshiba Medical Systems Europe
... unnecessary radiation exposure at the beginning and end of the scan length (dashed areas). ...
... unnecessary radiation exposure at the beginning and end of the scan length (dashed areas). ...
Welcome to Radiology
... • Teeth must be identified correctly! • Well-processed film is of good archival quality ...
... • Teeth must be identified correctly! • Well-processed film is of good archival quality ...
X-ray phase-contrast CO 2 angiography for sub
... 2004, Fitzgerald 2000). The method relies on differences in the refractive index within the studied object which result in variations in the phase of the wavefront emerging from the object. This can be measured in several ways, e.g., in differential phase contrast using a grating system (Momose 2005 ...
... 2004, Fitzgerald 2000). The method relies on differences in the refractive index within the studied object which result in variations in the phase of the wavefront emerging from the object. This can be measured in several ways, e.g., in differential phase contrast using a grating system (Momose 2005 ...
IMPORTANCE OF ORAL CONTRAST IN CT IMAGING
... ▶ A total of 1378 patients had an MDCT examination of the abdomen and pelvis between November 1, 2012, and October 31, 2013. 375 patients met the inclusion criteria (174 males and 201 females; mean age 57 years; range 18-97 years). Seven of 375 (1.9%) patients had a repeat CT examination with oral c ...
... ▶ A total of 1378 patients had an MDCT examination of the abdomen and pelvis between November 1, 2012, and October 31, 2013. 375 patients met the inclusion criteria (174 males and 201 females; mean age 57 years; range 18-97 years). Seven of 375 (1.9%) patients had a repeat CT examination with oral c ...
Digital X-ray imaging with image plate technology
... Well-practised procedures in the surgery, are easily transformed from film based to image plate technology. There is no change in the X-ray procedures in the surgery, but many things are simplified. Positioning and taking of exposures is exactly the same as film except for reduced patient dose. Than ...
... Well-practised procedures in the surgery, are easily transformed from film based to image plate technology. There is no change in the X-ray procedures in the surgery, but many things are simplified. Positioning and taking of exposures is exactly the same as film except for reduced patient dose. Than ...
Do Now - Dublin City Schools
... Improve penetrating quality of beam by absorbing out low-energy X-rays With large attenuation coefficients, X-rays get absorbed easily by soft tissue Use ~1 mm to 1 cm of Al ...
... Improve penetrating quality of beam by absorbing out low-energy X-rays With large attenuation coefficients, X-rays get absorbed easily by soft tissue Use ~1 mm to 1 cm of Al ...
Image-guided Positioning and Tracking - Dan Ruan
... definition and treatment planning are performed on a pre-treatment simulation image (often CT), yet the therapy is delivered to the instantaneous patient geometry later. The planning and delivery geometry may have discrepancy caused by patient setup, inter- and intra- fraction motion, in addition to ...
... definition and treatment planning are performed on a pre-treatment simulation image (often CT), yet the therapy is delivered to the instantaneous patient geometry later. The planning and delivery geometry may have discrepancy caused by patient setup, inter- and intra- fraction motion, in addition to ...
CT chest and gantry rotation time
... data demonstrated that there was no statistical difference in DLP or CTDIvol between rotational times investigated in this study (P > 0.05; Table 2). In conclusion, faster CT gantry rotation speed reduces scan time and motion artifacts. However, current results, together with previous studies, demons ...
... data demonstrated that there was no statistical difference in DLP or CTDIvol between rotational times investigated in this study (P > 0.05; Table 2). In conclusion, faster CT gantry rotation speed reduces scan time and motion artifacts. However, current results, together with previous studies, demons ...
Computed Tomography
... completed and documented. Although most of these procedures were performed three times (the minimum), several of them were performedfour or five times each until the candidate reached at least 125 procedures. ...
... completed and documented. Although most of these procedures were performed three times (the minimum), several of them were performedfour or five times each until the candidate reached at least 125 procedures. ...
Image-Guided Surgery
... and MR images. The complete application, built using IGSTK, compensates for organ movement without requiring intravensous access and is generally useful when organ movement cannot be well predicted or tracked using external markers. In liver lesions readiofrequency ablation, the lesion is localized ...
... and MR images. The complete application, built using IGSTK, compensates for organ movement without requiring intravensous access and is generally useful when organ movement cannot be well predicted or tracked using external markers. In liver lesions readiofrequency ablation, the lesion is localized ...
Depth-dependent Ion Concentrations in Healthy and Lesioned
... addition, the identical specimens were also harvested from one canine that did not undergo the ACL procedure (the normal-normal). µCT: Micro-CT imaging of the canine tibial cartilage/bone specimens was performed by a house-built micro computed tomography scanner following the procedure by Xie et al ...
... addition, the identical specimens were also harvested from one canine that did not undergo the ACL procedure (the normal-normal). µCT: Micro-CT imaging of the canine tibial cartilage/bone specimens was performed by a house-built micro computed tomography scanner following the procedure by Xie et al ...
(2011/65/EU) with the changes from January 2014
... X-ray image intensifiers until 31 December 2019 and in spare parts for Xray systems placed on the EU market before 1 January 2020. Lead, cadmium and hexavalent chromium in reused spare parts, recovered from medical devices placed on the market before 22 July 2014 and used in category 8 equipment pla ...
... X-ray image intensifiers until 31 December 2019 and in spare parts for Xray systems placed on the EU market before 1 January 2020. Lead, cadmium and hexavalent chromium in reused spare parts, recovered from medical devices placed on the market before 22 July 2014 and used in category 8 equipment pla ...
Chapter 3
... X-ray tube potential is usually 120 kVp to 140 kVp three phase of high frequency Such high kVp is used for higher intensity and penetrability, and therefore, less x-ray tube loading and lower patient dose. Dual focus tubes are common, usually having .5 and 1.0 mm focal spots, with the smaller focal ...
... X-ray tube potential is usually 120 kVp to 140 kVp three phase of high frequency Such high kVp is used for higher intensity and penetrability, and therefore, less x-ray tube loading and lower patient dose. Dual focus tubes are common, usually having .5 and 1.0 mm focal spots, with the smaller focal ...
Presentation - College of American Pathologists
... images and post-processing) • Same number of personnel & work hours • In many institutions, there was – – Same number of CT scanners – With newer (faster) systems ...
... images and post-processing) • Same number of personnel & work hours • In many institutions, there was – – Same number of CT scanners – With newer (faster) systems ...
Přednášky z lékařské biofyziky Masarykova univerzita v
... of photons per unit area per second) of the X-ray beam increases however the energy of individual photons does not. - The energy of the individual photons can be increased by increasing the voltage between the anode and cathode. Control panel – today most parameters of the device (including voltag ...
... of photons per unit area per second) of the X-ray beam increases however the energy of individual photons does not. - The energy of the individual photons can be increased by increasing the voltage between the anode and cathode. Control panel – today most parameters of the device (including voltag ...
An Attempt to Establish National Dose Reference Levels for
... Cormack, a South African American, wrote an algorithm for CT image reconstruction [5]. The advent of computed tomography (CT) has revolutionized diagnostic radiology. Since its inception in the 1970s, CT has been used intensively and demand for this imaging modality has increas ed rapidly. It is est ...
... Cormack, a South African American, wrote an algorithm for CT image reconstruction [5]. The advent of computed tomography (CT) has revolutionized diagnostic radiology. Since its inception in the 1970s, CT has been used intensively and demand for this imaging modality has increas ed rapidly. It is est ...
Iterative Reconstruction in Image Space
... also because the acquisition method is simple and results are reproducible. And because of CT’s versatility, it has become a standard examination in medical facilities around the globe – and accordingly contributes to a significant amount of overall radiation exposure in the entire population. Becau ...
... also because the acquisition method is simple and results are reproducible. And because of CT’s versatility, it has become a standard examination in medical facilities around the globe – and accordingly contributes to a significant amount of overall radiation exposure in the entire population. Becau ...
Descarge la noticia
... what amount of radiation the scanner is producing, but other factors need to be taken into consideration to estimate the dose absorbed by the patient [12]. The CTDIvol for each CT exam is automatically recorded in the patient’s imaging record. While this information is useful for radiologists and ph ...
... what amount of radiation the scanner is producing, but other factors need to be taken into consideration to estimate the dose absorbed by the patient [12]. The CTDIvol for each CT exam is automatically recorded in the patient’s imaging record. While this information is useful for radiologists and ph ...
Clinical applications of virtual, non
... requirements, while the lesion detection was Ackermann D, Mühlenbruch G, Flohr T, Günther RW, Mahnken AH (2009) Image fusion in dual energy identical. For lesion diameters of less than 5 mm, computed tomography: Effect on contrast enhancement, as well as tiny calci*ications, the VNC met ...
... requirements, while the lesion detection was Ackermann D, Mühlenbruch G, Flohr T, Günther RW, Mahnken AH (2009) Image fusion in dual energy identical. For lesion diameters of less than 5 mm, computed tomography: Effect on contrast enhancement, as well as tiny calci*ications, the VNC met ...
General Screen Film Radiography and Its Limitations
... (Chakera et al, 1982; Kohn et al, 1988; MacDonald-Jankowski & Lawinski, 1992; Regano & Sutton, 1992; Sanborg et al, 1993; Shrimpton et al, 1988) has been to document the improved dose reduction when particular filter materials are placed in the x-ray beam. The choice of filtration material can have ...
... (Chakera et al, 1982; Kohn et al, 1988; MacDonald-Jankowski & Lawinski, 1992; Regano & Sutton, 1992; Sanborg et al, 1993; Shrimpton et al, 1988) has been to document the improved dose reduction when particular filter materials are placed in the x-ray beam. The choice of filtration material can have ...
Diagnostic reference levels as a quality assurance tool
... 2 If DRL are consistently exceeded, reviewed to determine whether radiation has been optimised.”12 In addition, the ARPANSA Safety Guide, Section 7.8 (Radiation Protection Series No.14.1), suggests that “as part of the QA program, patient dose surveys are undertaken periodically to establish that t ...
... 2 If DRL are consistently exceeded, reviewed to determine whether radiation has been optimised.”12 In addition, the ARPANSA Safety Guide, Section 7.8 (Radiation Protection Series No.14.1), suggests that “as part of the QA program, patient dose surveys are undertaken periodically to establish that t ...
x-Ray imaging
... Low-density areas, like the lungs, do not block the beam as much as high-density areas The high level of transmitted radiation darkens the film ...
... Low-density areas, like the lungs, do not block the beam as much as high-density areas The high level of transmitted radiation darkens the film ...
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.