A literature review of electronic portal imaging for
... The complexity of treatment plans is also increasing, making it more difficult to discover possible errors because the dose levels and field shapes are no longer intuitive for specific treatment sites, and are therefore more difficult to detect by experience. During the treatment planning process, d ...
... The complexity of treatment plans is also increasing, making it more difficult to discover possible errors because the dose levels and field shapes are no longer intuitive for specific treatment sites, and are therefore more difficult to detect by experience. During the treatment planning process, d ...
Electromagnetic Tracking for Medical Imaging
... Respiratory motion has significant effects on abdominal and lung tumor position, and the uncertainty of the motion increases the treatment volume of the target due to a blurred tissue margin [1]. Respiratory correlated CT, which is obtained by oversampling images over the breathing cycles based on a ...
... Respiratory motion has significant effects on abdominal and lung tumor position, and the uncertainty of the motion increases the treatment volume of the target due to a blurred tissue margin [1]. Respiratory correlated CT, which is obtained by oversampling images over the breathing cycles based on a ...
radiation protection in diagnostic radiology - RPOP
... IAEA Training Material on Radiation Protection in Diagnostic and Interventional Radiology ...
... IAEA Training Material on Radiation Protection in Diagnostic and Interventional Radiology ...
The influence of bowtie filtration on cone
... the help of room lasers. A photograph of the cone-beam CT system is shown in Fig. 1共a兲. Image acquisition proceeded with gantry rotation over 360 deg for all the cases during which approximately 660 planar images were acquired at the medium FOV. Images of the circular phantom, with and without bowti ...
... the help of room lasers. A photograph of the cone-beam CT system is shown in Fig. 1共a兲. Image acquisition proceeded with gantry rotation over 360 deg for all the cases during which approximately 660 planar images were acquired at the medium FOV. Images of the circular phantom, with and without bowti ...
European Journal of Medical Physics
... mainly for IC, is rarely implemented and used. The ICRP is putting new efforts in redefining the methods to assess and use DRLs as a tool to limit non acceptable dose levels and helping in the optimization process. For staff exposure, ISEMIR project has highlighted a poor monitoring practice in IC br ...
... mainly for IC, is rarely implemented and used. The ICRP is putting new efforts in redefining the methods to assess and use DRLs as a tool to limit non acceptable dose levels and helping in the optimization process. For staff exposure, ISEMIR project has highlighted a poor monitoring practice in IC br ...
Influence of Horizontal Condylar Angle and X
... Key Words: Standard Panoramic Radiograph, Lateral Temporomandibular (TMJ) Panoramic Radiograph, Horizontal Condylar Angle, X-Ray Projection Angle ...
... Key Words: Standard Panoramic Radiograph, Lateral Temporomandibular (TMJ) Panoramic Radiograph, Horizontal Condylar Angle, X-Ray Projection Angle ...
Criteria for Acceptability of Medical Radiological Equipment used in
... radiotherapy equipment in normal use ought to be able to pass. The most common form of criterion is a “suspension level” for a measurement of a performance or safety parameter. Failure to meet a suspension level will establish that the operation of the equipment involved is sufficiently poor to rais ...
... radiotherapy equipment in normal use ought to be able to pass. The most common form of criterion is a “suspension level” for a measurement of a performance or safety parameter. Failure to meet a suspension level will establish that the operation of the equipment involved is sufficiently poor to rais ...
Safety Reports Series No.59
... Guidance levels are therefore required in the BSS as an important tool for optimization. They are an indication of “what is achievable with current good practice…”, but are “to be applied with flexibility to allow higher exposures if these are indicated by sound clinical judgement;…”. Concerning the ...
... Guidance levels are therefore required in the BSS as an important tool for optimization. They are an indication of “what is achievable with current good practice…”, but are “to be applied with flexibility to allow higher exposures if these are indicated by sound clinical judgement;…”. Concerning the ...
Coronary CT angiography: Diagnostic value and clinical challenges
... diastole of the third heartbeat. The scanner is equipped with several radiation reduction capabilities, including a dynamic helical collimator and an adaptive axial collimator to reduce z-over scanning[34,35]. Second generation of 128-slice CT was introduced with dual-source which uses two x-ray tub ...
... diastole of the third heartbeat. The scanner is equipped with several radiation reduction capabilities, including a dynamic helical collimator and an adaptive axial collimator to reduce z-over scanning[34,35]. Second generation of 128-slice CT was introduced with dual-source which uses two x-ray tub ...
image guided radiation therapy applications for
... treatment. Node volumes shrunk to 17% of the initial volume, moved up 1.3 cm, and received up to a 12% lower dose than that prescribed. It is shown that difficulties in imaging soft tissue in the neck region are circumvented with ultrasound imaging, and after dosimetric verification it is argued th ...
... treatment. Node volumes shrunk to 17% of the initial volume, moved up 1.3 cm, and received up to a 12% lower dose than that prescribed. It is shown that difficulties in imaging soft tissue in the neck region are circumvented with ultrasound imaging, and after dosimetric verification it is argued th ...
M C S O
... poorest agreement between the target motion and dynamic delivery and these are used as the „worst case motion parameters‟. ...
... poorest agreement between the target motion and dynamic delivery and these are used as the „worst case motion parameters‟. ...
Lung Nodule Volume Assessment and - QIBA Wiki
... X-ray computed tomography provides an effective means of detecting and monitoring pulmonary nodules, and can lead to increased survival (1) and reduced mortality (2) in individuals at high risk for lung cancer. Size quantification on serial imaging is helpful in evaluating whether a pulmonary nodule ...
... X-ray computed tomography provides an effective means of detecting and monitoring pulmonary nodules, and can lead to increased survival (1) and reduced mortality (2) in individuals at high risk for lung cancer. Size quantification on serial imaging is helpful in evaluating whether a pulmonary nodule ...
- Frank`s Hospital Workshop
... a qualified Gendex dealer should remove the cover from the scanner. Direct eye contact with the output beam from the laser may cause serious damage and possible blindness. ...
... a qualified Gendex dealer should remove the cover from the scanner. Direct eye contact with the output beam from the laser may cause serious damage and possible blindness. ...
Product Catalogue 2013/2014 Dosimetry and QA
... (Dr. Pychlau’s supervisor (annotation of the translator)) in the street. He invited me to have a look at what he had been doing in the meantime and told me about his having set up a business for the production of his invention, a dosemeter based on an electrostatic relay. It was out of sheer friends ...
... (Dr. Pychlau’s supervisor (annotation of the translator)) in the street. He invited me to have a look at what he had been doing in the meantime and told me about his having set up a business for the production of his invention, a dosemeter based on an electrostatic relay. It was out of sheer friends ...
Criteria for Acceptability of Medical Radiological Equipment
... way they should be used. Particular emphasis is placed on the roles of the medical physics expert, the medical practitioner and the holder of the equipment who is generally represented by the management of the institution involved. The importance of the practitioner and the holder/management is cons ...
... way they should be used. Particular emphasis is placed on the roles of the medical physics expert, the medical practitioner and the holder of the equipment who is generally represented by the management of the institution involved. The importance of the practitioner and the holder/management is cons ...
Chapter 15: Special Procedures and Techniques in
... stereotactic radiotherapy, and often the term radiosurgery is used to describe both techniques. ...
... stereotactic radiotherapy, and often the term radiosurgery is used to describe both techniques. ...
McClintock-Virtopsy-PI 2011
... • Recently deceased patients are scanned in MGH Radiology CT scanners – Same clinical scanners that are used for living patients ...
... • Recently deceased patients are scanned in MGH Radiology CT scanners – Same clinical scanners that are used for living patients ...
An X-ray Source Model and Characterization Method for Computing
... minimizing the irradiation of healthy tissues. While this conformality increases the radiation treatment plan quality, it also causes higher dose gradients near the edges of the treated area. These plans therefore require more precise patient positioning[135, 35]. Historically, patients were positio ...
... minimizing the irradiation of healthy tissues. While this conformality increases the radiation treatment plan quality, it also causes higher dose gradients near the edges of the treated area. These plans therefore require more precise patient positioning[135, 35]. Historically, patients were positio ...
Diagnostic Imaging Vol 2 - PACS and specialist imaging
... examinations) makes up approximately 25% of the examinations undertaken in the UK annually. It is also one of the largest groups of examinations performed, matched only by chest X-rays and limb/joint examinations. However, as in the majority of examinations, the radiation exposure is relatively low. ...
... examinations) makes up approximately 25% of the examinations undertaken in the UK annually. It is also one of the largest groups of examinations performed, matched only by chest X-rays and limb/joint examinations. However, as in the majority of examinations, the radiation exposure is relatively low. ...
RADIATION MEDICINE QA
... (Dr. Pychlau’s supervisor (annotation of the translator)) in the street. He invited me to have a look at what he had been doing in the meantime and told me about his having set up a business for the production of his invention, a dosemeter based on an electrostatic relay. It was out of sheer friends ...
... (Dr. Pychlau’s supervisor (annotation of the translator)) in the street. He invited me to have a look at what he had been doing in the meantime and told me about his having set up a business for the production of his invention, a dosemeter based on an electrostatic relay. It was out of sheer friends ...
Physical Principles and Technology of Clinical PET Imaging
... points. The energy carried by the positron may not be entirely dissipated during its journey in tissue and the annihilating electron-positron system could have a residual momentum. To conserve momentum, the annihilation photons are emitted less than 180 degrees apart, further contributing to a loss ...
... points. The energy carried by the positron may not be entirely dissipated during its journey in tissue and the annihilating electron-positron system could have a residual momentum. To conserve momentum, the annihilation photons are emitted less than 180 degrees apart, further contributing to a loss ...
Cone beam computed tomography: Adding three dimensions to
... is measured in Sieverts. CBCT has much lower effective dose of radiation when compared with traditional medical CT. CBCT dosages are largely determined by FOV, exposure beam type, technique settings (mA, kVp), beam geometry and amount of basis projections.[5] Published data on effective dose gives an ...
... is measured in Sieverts. CBCT has much lower effective dose of radiation when compared with traditional medical CT. CBCT dosages are largely determined by FOV, exposure beam type, technique settings (mA, kVp), beam geometry and amount of basis projections.[5] Published data on effective dose gives an ...
Attenuation correction for a combined 3D PET/CT scanner
... be scaled separately in energy and combined to form a mono-energetic attenuation map at any energy below 1022 keV. This approach was used to form a mono-energetic attenuation map at 140 keV by Hasegawa et al. for a prototype SPECT/CT detector block 10. A potential disadvantage of the dual-energy CT ...
... be scaled separately in energy and combined to form a mono-energetic attenuation map at any energy below 1022 keV. This approach was used to form a mono-energetic attenuation map at 140 keV by Hasegawa et al. for a prototype SPECT/CT detector block 10. A potential disadvantage of the dual-energy CT ...
Tomotherapy vs IMRT (952kB PPT)
... tomotherapy, are inherently much more reliable since the sensors need to read only in open or closed ...
... tomotherapy, are inherently much more reliable since the sensors need to read only in open or closed ...
Backscatter X-ray
Backscatter X-ray is an advanced X-ray imaging technology. Traditional X-ray machines detect hard and soft materials by the variation in transmission through the target. In contrast, backscatter X-ray detects the radiation that reflects from the target. It has potential applications where less-destructive examination is required, and can be used if only one side of the target is available for examination.The technology is one of two types of whole body imaging technologies that have been used to perform full-body scans of airline passengers to detect hidden weapons, tools, liquids, narcotics, currency, and other contraband. A competing technology is millimeter wave scanner. An airport security machine of this type is also referred to as ""body scanner"", ""whole body imager (WBI)"", ""security scanner"", and ""naked scanner"".