The influence of bowtie filtration on cone
... Cone-beam computed tomography 共CBCT兲 systems are employed in radiation therapy to provide information regarding daily target and normal tissue localization during the course of fractionated radiation treatment. CBCT allows radiation to be directed at tumors with greater accuracy and precision than w ...
... Cone-beam computed tomography 共CBCT兲 systems are employed in radiation therapy to provide information regarding daily target and normal tissue localization during the course of fractionated radiation treatment. CBCT allows radiation to be directed at tumors with greater accuracy and precision than w ...
Energy Subtraction Methods as an Alternative to Conventional X
... iodine SNR equal to that of DSA for low iodine mass loadings (sufficient for artery sizes) for the same patient entrance exposure, and therefore may provide alternatives to DSA in situations where motion artifacts are expected to render a study as non-diagnostic, such as in coronary applications. In ...
... iodine SNR equal to that of DSA for low iodine mass loadings (sufficient for artery sizes) for the same patient entrance exposure, and therefore may provide alternatives to DSA in situations where motion artifacts are expected to render a study as non-diagnostic, such as in coronary applications. In ...
Assessment of the Performance of an Enhanced Planar Processing
... diagnosis of osseous metastasis. It is known that the fraction of bone containing metastatic lesions in oncologic patients is a strong prognostic indicator of survival longevity. Moreover, the presence or absence of bone metastases will influence the treatment planning, requiring an accurate interpr ...
... diagnosis of osseous metastasis. It is known that the fraction of bone containing metastatic lesions in oncologic patients is a strong prognostic indicator of survival longevity. Moreover, the presence or absence of bone metastases will influence the treatment planning, requiring an accurate interpr ...
19. Optimization of protection in mammography - RPOP
... in the image • Receptor blur: (screen-film combination) can be as small as 0.1 - 0.15 mm (full width at half maximum of the point response function) with a limiting value as high as 20 cycles per mm • Geometric unsharpness: focal spot size and imaging geometry must be chosen so that the overall unsh ...
... in the image • Receptor blur: (screen-film combination) can be as small as 0.1 - 0.15 mm (full width at half maximum of the point response function) with a limiting value as high as 20 cycles per mm • Geometric unsharpness: focal spot size and imaging geometry must be chosen so that the overall unsh ...
RADIATION PROTECTION IN DIAGNOSTIC RADIOLOGY
... in the image • Receptor blur: (screen-film combination) can be as small as 0.1 - 0.15 mm (full width at half maximum of the point response function) with a limiting value as high as 20 cycles per mm • Geometric unsharpness: focal spot size and imaging geometry must be chosen so that the overall unsh ...
... in the image • Receptor blur: (screen-film combination) can be as small as 0.1 - 0.15 mm (full width at half maximum of the point response function) with a limiting value as high as 20 cycles per mm • Geometric unsharpness: focal spot size and imaging geometry must be chosen so that the overall unsh ...
Medical image registration
... tomographic images. That is aligning images that sample three-dimensional space with reasonably isotropic resolution. Furthermore, it is often assumed that between image acquisitions, the anatomical and pathological structures of interest do not deform or distort. This ‘rigid body’ assumption simpli ...
... tomographic images. That is aligning images that sample three-dimensional space with reasonably isotropic resolution. Furthermore, it is often assumed that between image acquisitions, the anatomical and pathological structures of interest do not deform or distort. This ‘rigid body’ assumption simpli ...
Medical image registration
... tomographic images. That is aligning images that sample three-dimensional space with reasonably isotropic resolution. Furthermore, it is often assumed that between image acquisitions, the anatomical and pathological structures of interest do not deform or distort. This ‘rigid body’ assumption simpli ...
... tomographic images. That is aligning images that sample three-dimensional space with reasonably isotropic resolution. Furthermore, it is often assumed that between image acquisitions, the anatomical and pathological structures of interest do not deform or distort. This ‘rigid body’ assumption simpli ...
Storage Phosphors for Medical Imaging
... About 20 years ago, X-ray radiography was the only non-digital medical imaging technique. Technically, fluoroscopy was not digital either, but since it produces moving images it is considered separate. X-ray images had to be stored in voluminous file cabinets and separate, inefficient image retrieva ...
... About 20 years ago, X-ray radiography was the only non-digital medical imaging technique. Technically, fluoroscopy was not digital either, but since it produces moving images it is considered separate. X-ray images had to be stored in voluminous file cabinets and separate, inefficient image retrieva ...
Storage Phosphors for Medical Imaging
... About 20 years ago, X-ray radiography was the only non-digital medical imaging technique. Technically, fluoroscopy was not digital either, but since it produces moving images it is considered separate. X-ray images had to be stored in voluminous file cabinets and separate, inefficient image retrieva ...
... About 20 years ago, X-ray radiography was the only non-digital medical imaging technique. Technically, fluoroscopy was not digital either, but since it produces moving images it is considered separate. X-ray images had to be stored in voluminous file cabinets and separate, inefficient image retrieva ...
Abdominal Wall CT Angiography: A Detailed
... with a cheaper overall cost of treatment (11,12) when compared with alternative surgical techniques. The superficial inferior epigastric artery can also be used for an adipocutaneous musclesparing flap, and it is the preferred surgical option for an abdominal wall free flap, as it does not require i ...
... with a cheaper overall cost of treatment (11,12) when compared with alternative surgical techniques. The superficial inferior epigastric artery can also be used for an adipocutaneous musclesparing flap, and it is the preferred surgical option for an abdominal wall free flap, as it does not require i ...
Essentials and Guidelines for Clinical Medical Physics Residency Training Programs
... There is a clear need for established standards for medical physics residency training. The complexity of techniques in imaging, nuclear medicine, and radiation oncology continues to increase with each passing year. It is therefore imperative that training requirements and competencies are routinely ...
... There is a clear need for established standards for medical physics residency training. The complexity of techniques in imaging, nuclear medicine, and radiation oncology continues to increase with each passing year. It is therefore imperative that training requirements and competencies are routinely ...
AAPM Report No 249
... There is a clear need for established standards for medical physics residency training. The complexity of techniques in imaging, nuclear medicine, and radiation oncology continues to increase with each passing year. It is therefore imperative that training requirements and competencies are routinely ...
... There is a clear need for established standards for medical physics residency training. The complexity of techniques in imaging, nuclear medicine, and radiation oncology continues to increase with each passing year. It is therefore imperative that training requirements and competencies are routinely ...
Review Article Use of Cone Beam Computed Tomography in
... digital panoramic radiographs range from 5.5 to 22.0 μSv [17], while digital cephalometric radiographs have effective doses of 2.2 to 3.4 μSv [18]. This compares with an average annual effective dose from background radiation in the United States of about 3,000 μSv (3.0 mSv). There are a number of fac ...
... digital panoramic radiographs range from 5.5 to 22.0 μSv [17], while digital cephalometric radiographs have effective doses of 2.2 to 3.4 μSv [18]. This compares with an average annual effective dose from background radiation in the United States of about 3,000 μSv (3.0 mSv). There are a number of fac ...
Safety Code 35: Radiation Protection in Radiology
... and radioscopy can be significantly higher. However, with well-designed, installed and maintained X-ray equipment, and through use of proper procedures by trained operators, unnecessary exposure to patients can be reduced significantly, with no decrease in the value of medical information derived. T ...
... and radioscopy can be significantly higher. However, with well-designed, installed and maintained X-ray equipment, and through use of proper procedures by trained operators, unnecessary exposure to patients can be reduced significantly, with no decrease in the value of medical information derived. T ...
Safety Code 35: Radiation Protection in Radiology
... and radioscopy can be significantly higher. However, with well-designed, installed and maintained X-ray equipment, and through use of proper procedures by trained operators, unnecessary exposure to patients can be reduced significantly, with no decrease in the value of medical information derived. T ...
... and radioscopy can be significantly higher. However, with well-designed, installed and maintained X-ray equipment, and through use of proper procedures by trained operators, unnecessary exposure to patients can be reduced significantly, with no decrease in the value of medical information derived. T ...
II. Clinical Context and Claims - QIBA Wiki
... This protocol describes image acquisition, processing, analysis, change measurements and interpretation for screening and/or quantitatively evaluating the progression/regression of early stage (Stage 1-2) measurable target lesions. A key focus in this regard is with small lung tumors around 1cm3 in ...
... This protocol describes image acquisition, processing, analysis, change measurements and interpretation for screening and/or quantitatively evaluating the progression/regression of early stage (Stage 1-2) measurable target lesions. A key focus in this regard is with small lung tumors around 1cm3 in ...
Radiation Therapy Professional Curriculum
... therapists. A national committee representing a variety of program types from across the country developed the curriculum. Input from The American Registry of Radiologic Technologists (ARRT) and the Joint Review Committee on Education in Radiologic Technology (JRCERT) also were included in this revi ...
... therapists. A national committee representing a variety of program types from across the country developed the curriculum. Input from The American Registry of Radiologic Technologists (ARRT) and the Joint Review Committee on Education in Radiologic Technology (JRCERT) also were included in this revi ...
Chapter 7 Digital Radiographic Image Processing and
... the spreading out of light photons. Because there is a small distance between the phosphor plate surface and the photosensitive diode of the photomultiplier, some light spreads out there as well, resulting in loss of information. ...
... the spreading out of light photons. Because there is a small distance between the phosphor plate surface and the photosensitive diode of the photomultiplier, some light spreads out there as well, resulting in loss of information. ...
A Study on Evaluation of kV-CBCT-image-based Treatment
... CBCT based on flat-panel technology integrated in a medical linear accelerator has improved the precision of targeting in radiotherapy. Two important applications of CBCT are patient setup and dose verification. A CBCT image of the patient on the treatment table can be acquired in about 60 seconds, ...
... CBCT based on flat-panel technology integrated in a medical linear accelerator has improved the precision of targeting in radiotherapy. Two important applications of CBCT are patient setup and dose verification. A CBCT image of the patient on the treatment table can be acquired in about 60 seconds, ...
Safety Reports Series No.59
... Radiation and for the Safety of Radiation Sources (BSS) [1] require that medical practitioners who prescribe or conduct diagnostic radiological examinations “ensure that the exposure of patients be the minimum necessary to achieve the required diagnostic objective, taking into account norms of accep ...
... Radiation and for the Safety of Radiation Sources (BSS) [1] require that medical practitioners who prescribe or conduct diagnostic radiological examinations “ensure that the exposure of patients be the minimum necessary to achieve the required diagnostic objective, taking into account norms of accep ...
Patient and Staff Radiological Protection in Cardiology
... 5. Radiological protection for nuclear cardiology Appropriate use criteria and guidelines that help to set standards for justification of nuclear cardiology procedures have been developed through consensus efforts of professional societies. Justification needs to be performed on an individualized, p ...
... 5. Radiological protection for nuclear cardiology Appropriate use criteria and guidelines that help to set standards for justification of nuclear cardiology procedures have been developed through consensus efforts of professional societies. Justification needs to be performed on an individualized, p ...
Imaging dose from cone beam computed tomography in radiation
... previous publication Sykes [8] et al. reported on typical doses from commercial CBCT systems as well as on clinical consequences (risks and benefits) of using CBCT based IGRT. Although that work compiled useful data, it was not designed as a literature review. The aim of this systematic review was to ...
... previous publication Sykes [8] et al. reported on typical doses from commercial CBCT systems as well as on clinical consequences (risks and benefits) of using CBCT based IGRT. Although that work compiled useful data, it was not designed as a literature review. The aim of this systematic review was to ...
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.