Care of the X
... ‘damage’ to the X-ray tube, since the anode becomes slightly more pitted and the filament becomes slightly thinner. However, in this context unacceptable damage means that amount of damage which will seriously impair the performance of the unit for further exposures or even to make the unit complete ...
... ‘damage’ to the X-ray tube, since the anode becomes slightly more pitted and the filament becomes slightly thinner. However, in this context unacceptable damage means that amount of damage which will seriously impair the performance of the unit for further exposures or even to make the unit complete ...
Developing an Action..
... can only be estimated for a given exam since numerous patient- and exam-specific factors dramatically alter how much radiation is absorbed in different patients for the same imaging protocol from a given device. Thus, even if the scanner-delivered exposure is constant, the number of x-ray photons th ...
... can only be estimated for a given exam since numerous patient- and exam-specific factors dramatically alter how much radiation is absorbed in different patients for the same imaging protocol from a given device. Thus, even if the scanner-delivered exposure is constant, the number of x-ray photons th ...
DISP-2003: Introduction to Digital Signal Processing
... - Tissues similar in two physical properties may differ in a third. Note: - Each modality must relate the physical property it measures to normal or abnormal tissue function if possible. - However, anatomical information and knowledge of a large patient base may be enough. - i.e. A shadow on lung or ...
... - Tissues similar in two physical properties may differ in a third. Note: - Each modality must relate the physical property it measures to normal or abnormal tissue function if possible. - However, anatomical information and knowledge of a large patient base may be enough. - i.e. A shadow on lung or ...
Policy Statement on Thyroid Shielding During Diagnostic Medical
... the potential risks and benefits to any diagnostic procedure in a manner that is understandable to them. 3. The ATA recommends that clinicians are adequately informed about the potential risks of radiation and the general principles of radiation dosimetry, especially as they relate to children and t ...
... the potential risks and benefits to any diagnostic procedure in a manner that is understandable to them. 3. The ATA recommends that clinicians are adequately informed about the potential risks of radiation and the general principles of radiation dosimetry, especially as they relate to children and t ...
European Commission. European guidelines on radiation protection
... Luciano González García, Professor Eliseo Vaño, Dr. L.K.Harding. The panel members would also like to acknowledge the help of several people: We are indebted to Ian Napier, Andy Lecomber and Graham Pavitt and to translators: Michael N. Rushton, C. Albert Yeung and Andrea Bruhn. ...
... Luciano González García, Professor Eliseo Vaño, Dr. L.K.Harding. The panel members would also like to acknowledge the help of several people: We are indebted to Ian Napier, Andy Lecomber and Graham Pavitt and to translators: Michael N. Rushton, C. Albert Yeung and Andrea Bruhn. ...
I. Radiographic Terminology
... Special (Alternate) Projections Better demonstrate specific anatomic or certain pathology The patients who can’t cooperate fully ...
... Special (Alternate) Projections Better demonstrate specific anatomic or certain pathology The patients who can’t cooperate fully ...
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 ...
Signal, noise power spectrum, and detective quantum
... The performance of an indirect-detection, active matrix flat-panel imager ~FPI! at diagnostic energies is reported in terms of measured and theoretical signal size, noise power spectrum ~NPS!, and detective quantum efficiency ~DQE!. Based upon a 153631920 pixel, 127 mm pitch array of a-Si:H thin-fil ...
... The performance of an indirect-detection, active matrix flat-panel imager ~FPI! at diagnostic energies is reported in terms of measured and theoretical signal size, noise power spectrum ~NPS!, and detective quantum efficiency ~DQE!. Based upon a 153631920 pixel, 127 mm pitch array of a-Si:H thin-fil ...
Y-90 SIRT in the Liver - Emory Radiology
... which requires right and left lobe tumor and liver volumes to be known Lobar dose in GBq = [(BSA – 0.2) + (% tumor involvement of lobe to be treated/100)] X [percent of total liver that treated lobe comprises] Then apply various correction factors. ...
... which requires right and left lobe tumor and liver volumes to be known Lobar dose in GBq = [(BSA – 0.2) + (% tumor involvement of lobe to be treated/100)] X [percent of total liver that treated lobe comprises] Then apply various correction factors. ...
Techniques and Applications of Automatic Tube Current Modulation
... angles). However, in a noncircular crosssectional geometry, attenuation varies strongly in different projections, sometimes by more than three orders of magnitude. In these settings, image noise in high-attenuation projection angles determines the overall image noise content. Thus, at angular projec ...
... angles). However, in a noncircular crosssectional geometry, attenuation varies strongly in different projections, sometimes by more than three orders of magnitude. In these settings, image noise in high-attenuation projection angles determines the overall image noise content. Thus, at angular projec ...
Non-Invasive Microstructure and Morphology
... of MRI is in the range of 4–6 mm and only a few can reach up to 1 mm [22]. The lung is an air-filled organ. At the air-tissue boundary, the refractive index changes significantly, so the lung becomes highly visible in PCI images. The lung images in our experiment have shown dramatic improvement in q ...
... of MRI is in the range of 4–6 mm and only a few can reach up to 1 mm [22]. The lung is an air-filled organ. At the air-tissue boundary, the refractive index changes significantly, so the lung becomes highly visible in PCI images. The lung images in our experiment have shown dramatic improvement in q ...
Nigerian Radiation Safety in Diagnostic and Interventional
... risks whereby the legal person responsible for the practice has, as appropriate, prepared and submitted a safety assessment of the facilities and equipment to the Authority. The practice or use is authorized with conditions or limitations as appropriate. The requirements for safety assessment and th ...
... risks whereby the legal person responsible for the practice has, as appropriate, prepared and submitted a safety assessment of the facilities and equipment to the Authority. The practice or use is authorized with conditions or limitations as appropriate. The requirements for safety assessment and th ...
Cone Beam Computed Tomography
... positioning, volume size (FOV), radiation quality, image capturing and reconstruction, image resolution and radiation dose. When new technology is introduced one must make sure that diagnostic accuracy is better or at least as good as the one it can be expected to replace. The CBCT brand tested was ...
... positioning, volume size (FOV), radiation quality, image capturing and reconstruction, image resolution and radiation dose. When new technology is introduced one must make sure that diagnostic accuracy is better or at least as good as the one it can be expected to replace. The CBCT brand tested was ...
Image Guided Radiation Therapy: A Refresher
... and in selected sites reduce toxicity and improve local control. The whole chain of interventions in the RT process should be prospectively assessed. This is particularly important because other steps in the RT process (eg, contouring or valid measurements of toxicity) are at least as important as h ...
... and in selected sites reduce toxicity and improve local control. The whole chain of interventions in the RT process should be prospectively assessed. This is particularly important because other steps in the RT process (eg, contouring or valid measurements of toxicity) are at least as important as h ...
01 - Use of a dDVH decomposition technique to evaluate
... The NTCP ranged from 0.4% to 20%. It was clear and not surprising that the NTCP for patients with right lung involvement was significantly higher. In our conclusion it are these patients specifically who will receive benefit from an IMRT based treatment while the other patients can be treated conven ...
... The NTCP ranged from 0.4% to 20%. It was clear and not surprising that the NTCP for patients with right lung involvement was significantly higher. In our conclusion it are these patients specifically who will receive benefit from an IMRT based treatment while the other patients can be treated conven ...
Flash speed. Lowest dose. - VCU Department of Radiology
... depends upon high dose except with extremely stable and low heart rates. For routine cases, however, the dose required in less than ideal circumstances is significantly higher than cardiac cath, that normally requires at least 5 mSv for pure diagnostic procedures. Therefore, cardiac CT has been diff ...
... depends upon high dose except with extremely stable and low heart rates. For routine cases, however, the dose required in less than ideal circumstances is significantly higher than cardiac cath, that normally requires at least 5 mSv for pure diagnostic procedures. Therefore, cardiac CT has been diff ...
Slides to IAEA Radiation Oncology Physics Handbook
... measurements of air kerma levels due to the patient scattered radiation using a patient phantom for typical radiographic and fluoroscopic procedures. As mobile radiography may take place in environments where other patients or members of the public may be in close proximity it is essential that go ...
... measurements of air kerma levels due to the patient scattered radiation using a patient phantom for typical radiographic and fluoroscopic procedures. As mobile radiography may take place in environments where other patients or members of the public may be in close proximity it is essential that go ...
R40 - American College of Radiology
... patients. Practice Parameters and Technical Standards are not inflexible rules or requirements of practice and are not intended, nor should they be used, to establish a legal standard of care1. For these reasons and those set forth below, the American College of Radiology and our collaborating medic ...
... patients. Practice Parameters and Technical Standards are not inflexible rules or requirements of practice and are not intended, nor should they be used, to establish a legal standard of care1. For these reasons and those set forth below, the American College of Radiology and our collaborating medic ...
Academic Program Recommendations for Graduate Degrees in Medical Physics Physicists Committee
... Since the first publication of this report in 1993, education in the field of Medical Physics has experienced considerable growth and change. However, much remains the same. The original document was written to provide guidance to medical physics training programs as to the minimal curriculum suitab ...
... Since the first publication of this report in 1993, education in the field of Medical Physics has experienced considerable growth and change. However, much remains the same. The original document was written to provide guidance to medical physics training programs as to the minimal curriculum suitab ...
AAPM Report 197 - Louisiana State University
... Since the first publication of this report in 1993, education in the field of Medical Physics has experienced considerable growth and change. However, much remains the same. The original document was written to provide guidance to medical physics training programs as to the minimal curriculum suitab ...
... Since the first publication of this report in 1993, education in the field of Medical Physics has experienced considerable growth and change. However, much remains the same. The original document was written to provide guidance to medical physics training programs as to the minimal curriculum suitab ...
Clinical commissioning and use of the Novalis Tx linear accelerator
... Received 4 August, 2011; accepted 25 January, 2012 The purpose of this study was to perform comprehensive measurements and testing of a Novalis Tx linear accelerator, and to develop technical guidelines for commissioning from the time of acceptance testing to the first clinical treatment. The Novali ...
... Received 4 August, 2011; accepted 25 January, 2012 The purpose of this study was to perform comprehensive measurements and testing of a Novalis Tx linear accelerator, and to develop technical guidelines for commissioning from the time of acceptance testing to the first clinical treatment. The Novali ...
ACR–ASTRO Practice Parameter for Image
... One of the undeniable benefits of IGRT is the minimization of irradiation of surrounding tissues (organs at risk and other nontarget tissues). However this generally comes at the cost of increased dose due to increased imaging, eg, fluoroscopic imaging or MV cine imaging. As discussed in the ACR–AAP ...
... One of the undeniable benefits of IGRT is the minimization of irradiation of surrounding tissues (organs at risk and other nontarget tissues). However this generally comes at the cost of increased dose due to increased imaging, eg, fluoroscopic imaging or MV cine imaging. As discussed in the ACR–AAP ...
Lecture 10 Mammography Thur - International Atomic Energy Agency
... visible small differences in soft tissue density • Sharpness: capability of the system to make visible small details (calcifications down to 0.1 mm) • Dose: the female breast is a very radiosensitive organ and there is a risk of carcinogenesis associated with the technique • Noise: determines how fa ...
... visible small differences in soft tissue density • Sharpness: capability of the system to make visible small details (calcifications down to 0.1 mm) • Dose: the female breast is a very radiosensitive organ and there is a risk of carcinogenesis associated with the technique • Noise: determines how fa ...
Lecture 10 Mammography Thur - gnssn
... visible small differences in soft tissue density • Sharpness: capability of the system to make visible small details (calcifications down to 0.1 mm) • Dose: the female breast is a very radiosensitive organ and there is a risk of carcinogenesis associated with the technique • Noise: determines how fa ...
... visible small differences in soft tissue density • Sharpness: capability of the system to make visible small details (calcifications down to 0.1 mm) • Dose: the female breast is a very radiosensitive organ and there is a risk of carcinogenesis associated with the technique • Noise: determines how fa ...
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 ...
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"".