Tomographic Imaging on a Cobalt Radiotherapy Machine Matthew Brendon Marsh
... with an opening in the shield. Sources are typically replaced after approximately one half-life. Most modern teletherapy equipment does not use radioactive sources. Rather, a particle accelerator– usually a linear accelerator (linac)– is used to create a high energy electron beam. It is possible to ...
... with an opening in the shield. Sources are typically replaced after approximately one half-life. Most modern teletherapy equipment does not use radioactive sources. Rather, a particle accelerator– usually a linear accelerator (linac)– is used to create a high energy electron beam. It is possible to ...
Lateral - XinXii
... and attitude in imaging and therapeutic procedures to assist them carry out diagnostic and therapeutic procedures for patients needing these examinations in the hospitals. The book will be of more value to all students undertaking training in Medical Imaging, Radiographers and any other medical prof ...
... and attitude in imaging and therapeutic procedures to assist them carry out diagnostic and therapeutic procedures for patients needing these examinations in the hospitals. The book will be of more value to all students undertaking training in Medical Imaging, Radiographers and any other medical prof ...
Dual Energy CT Attenuation Correction Methods for Quantitative
... coefficients at 511 keV can be obtained by collecting two CT scans using X-ray beams with different energy spectra and by estimating the energy dependence of attenuation coefficients in terms of a Compton scattering component and a photoelectric absorption component (39, 40), or by other material ba ...
... coefficients at 511 keV can be obtained by collecting two CT scans using X-ray beams with different energy spectra and by estimating the energy dependence of attenuation coefficients in terms of a Compton scattering component and a photoelectric absorption component (39, 40), or by other material ba ...
Easy Quality Control with
... VI. CONSTANCY TEST - EQUIPMENT FOR DIGITAL RADIOGRAPHY ACC. TO DIN 6868-13 [6]........... 37 6.1 TEST PARAMETERS ................................................................................................................................... 37 6.2 TEST EQUIPMENT.................................. ...
... VI. CONSTANCY TEST - EQUIPMENT FOR DIGITAL RADIOGRAPHY ACC. TO DIN 6868-13 [6]........... 37 6.1 TEST PARAMETERS ................................................................................................................................... 37 6.2 TEST EQUIPMENT.................................. ...
Dental CBCT performance testing for physicists and technologists
... equipment is functioning optimally. Used in conjunction with operator training, consistently applied scanner protocols, and evaluation of patient doses, regular performance testing can help ensure that scans can be taken at the lowest practical dose, consistent with the diagnostic task at hand. The ...
... equipment is functioning optimally. Used in conjunction with operator training, consistently applied scanner protocols, and evaluation of patient doses, regular performance testing can help ensure that scans can be taken at the lowest practical dose, consistent with the diagnostic task at hand. The ...
Quality assurance for image-guided radiation therapy
... Methods: The AAPM TG-179 reviews clinical implementation and quality assurance aspects for commercially available CT-based IGRT, each with their unique capabilities and underlying physics. The systems described are kilovolt and megavolt cone-beam CT, fan-beam MVCT, and CT-on-rails. A summary of the ...
... Methods: The AAPM TG-179 reviews clinical implementation and quality assurance aspects for commercially available CT-based IGRT, each with their unique capabilities and underlying physics. The systems described are kilovolt and megavolt cone-beam CT, fan-beam MVCT, and CT-on-rails. A summary of the ...
Imaging in radiotherapy - Nuclear Sciences and Applications
... In the developed countries, radiation therapy is employed in over 50% of cancer patients at some point in the management of their disease. As a local therapy, radiation therapy seeks to exploit technology to conform the treatment to the targeted structure while avoiding surrounding critical normal t ...
... In the developed countries, radiation therapy is employed in over 50% of cancer patients at some point in the management of their disease. As a local therapy, radiation therapy seeks to exploit technology to conform the treatment to the targeted structure while avoiding surrounding critical normal t ...
CT scanner automatic exposure control systems
... Existing methods for setting exposure levels in CT The usual method for adjusting exposure levels in CT to compensate for patient size is to adjust the tube current or rotation time in order to change the mAs (tube current – time product). Although it would be possible to achieve this by altering ei ...
... Existing methods for setting exposure levels in CT The usual method for adjusting exposure levels in CT to compensate for patient size is to adjust the tube current or rotation time in order to change the mAs (tube current – time product). Although it would be possible to achieve this by altering ei ...
Imaging in Radiotherapy, IAEA Consultant`s meeting report
... In the developed countries, radiation therapy is employed in over 50% of cancer patients at some point in the management of their disease. As a local therapy, radiation therapy seeks to exploit technology to conform the treatment to the targeted structure while avoiding surrounding critical normal t ...
... In the developed countries, radiation therapy is employed in over 50% of cancer patients at some point in the management of their disease. As a local therapy, radiation therapy seeks to exploit technology to conform the treatment to the targeted structure while avoiding surrounding critical normal t ...
Anniversary Paper: Development of x
... when the tube is run at two different kVp could be used to develop dual-energy techniques that allow one to extract effective atomic number and electron density information.19,32 The noise properties of the dual-energy technique were studied first in 1979.33 In fact, these techniques remain the foun ...
... when the tube is run at two different kVp could be used to develop dual-energy techniques that allow one to extract effective atomic number and electron density information.19,32 The noise properties of the dual-energy technique were studied first in 1979.33 In fact, these techniques remain the foun ...
Using Cone Beam CT in Clinical Practice
... factors utilized.29-31 Even though F-speed film is recommended for routine use,32 many dentists still use D-speed film with round collimation for their full mouth series technique; this examination results in an effective dose of ~388 μSv; or, three to five times the radiation dose of many standard ...
... factors utilized.29-31 Even though F-speed film is recommended for routine use,32 many dentists still use D-speed film with round collimation for their full mouth series technique; this examination results in an effective dose of ~388 μSv; or, three to five times the radiation dose of many standard ...
AAPM REPORT NO. 54 STEREOTACTIC RADIOSURGERY Report
... took place in April 1948 (Kerst, 1975). The first combined use of an x-ray unit and stereotactic frame occurred in 1950 (Leksell, 1951, 1983). This report is written primarily for clinical medical physicists who are co.sidering acquisitioning and cmnmissioning of a SRS program at their facility. It ...
... took place in April 1948 (Kerst, 1975). The first combined use of an x-ray unit and stereotactic frame occurred in 1950 (Leksell, 1951, 1983). This report is written primarily for clinical medical physicists who are co.sidering acquisitioning and cmnmissioning of a SRS program at their facility. It ...
The management of imaging dose during image-guided
... times that of a single high-quality CT and potentially as much as the cumulative dose from ten individual CTs. If organ motion is going to be accommodated in a planning target volume 共PTV兲 margin then the CT can provide the margin information. If the treatment plan involves active motion management ...
... times that of a single high-quality CT and potentially as much as the cumulative dose from ten individual CTs. If organ motion is going to be accommodated in a planning target volume 共PTV兲 margin then the CT can provide the margin information. If the treatment plan involves active motion management ...
The management of imaging dose during image-guided
... times that of a single high-quality CT and potentially as much as the cumulative dose from ten individual CTs. If organ motion is going to be accommodated in a planning target volume 共PTV兲 margin then the CT can provide the margin information. If the treatment plan involves active motion management ...
... times that of a single high-quality CT and potentially as much as the cumulative dose from ten individual CTs. If organ motion is going to be accommodated in a planning target volume 共PTV兲 margin then the CT can provide the margin information. If the treatment plan involves active motion management ...
Perfusion characteristics of late radiation injury of parotid glands
... clinical data, including the gender, age, primary tumor site, the time interval after radiotherapy (called RT-to-MR interval in this paper), initial and current grade of dry mouth, and radiation dose to either parotid gland of the radiotherapy group are listed in Table 1. The control group was compr ...
... clinical data, including the gender, age, primary tumor site, the time interval after radiotherapy (called RT-to-MR interval in this paper), initial and current grade of dry mouth, and radiation dose to either parotid gland of the radiotherapy group are listed in Table 1. The control group was compr ...
Brendan Hill - School of Physics
... gel [5]. A procedure for manufacturing what is now commonly referred to in the literature as PAG, an acronym for polyacrylamide gel, was later described [6]. Upon exposure of the radiological tissue equivalent [7] PAG dosimeter to radiation, polymerization of the co-monomers is induced by the free r ...
... gel [5]. A procedure for manufacturing what is now commonly referred to in the literature as PAG, an acronym for polyacrylamide gel, was later described [6]. Upon exposure of the radiological tissue equivalent [7] PAG dosimeter to radiation, polymerization of the co-monomers is induced by the free r ...
GE_HD_750_ CT 数据手册
... allows users to visualize the ECG waveform directly on the CT scanner console during the scan. The waveform data can be viewed to determine where prospectively created images are located with respect to the heart cycle to better understand and avoid motion artifacts like blurring or mis-registration ...
... allows users to visualize the ECG waveform directly on the CT scanner console during the scan. The waveform data can be viewed to determine where prospectively created images are located with respect to the heart cycle to better understand and avoid motion artifacts like blurring or mis-registration ...
Storage Phosphors for Medical Imaging
... energy should be high. This implies that a large fraction of the mobile charge carriers created by the absorbed X-ray quanta is converted into trapped electrons and holes forming defect aggregates leading to PSL. The energy needed to create a trapped electron and hole in the storage phosphors in com ...
... energy should be high. This implies that a large fraction of the mobile charge carriers created by the absorbed X-ray quanta is converted into trapped electrons and holes forming defect aggregates leading to PSL. The energy needed to create a trapped electron and hole in the storage phosphors in com ...
Storage Phosphors for Medical Imaging
... energy should be high. This implies that a large fraction of the mobile charge carriers created by the absorbed X-ray quanta is converted into trapped electrons and holes forming defect aggregates leading to PSL. The energy needed to create a trapped electron and hole in the storage phosphors in com ...
... energy should be high. This implies that a large fraction of the mobile charge carriers created by the absorbed X-ray quanta is converted into trapped electrons and holes forming defect aggregates leading to PSL. The energy needed to create a trapped electron and hole in the storage phosphors in com ...
The potential role of 3D x-ray spectroscopy in the imaging of breast
... the breast in what is known as pendant geometry. ...
... the breast in what is known as pendant geometry. ...
Nuclear Physics in Medicine
... applied to small animal. Finally multimodality techniques which allow the merging of molecular information with anatomical details, such as PET/CT; SPECT/CT and PET/MR will be illustrated, These are the fields where the technology is rapidly evolving these days. ...
... applied to small animal. Finally multimodality techniques which allow the merging of molecular information with anatomical details, such as PET/CT; SPECT/CT and PET/MR will be illustrated, These are the fields where the technology is rapidly evolving these days. ...
Essentials of Bone Densitometry for the Medical Physicist
... Osteoporosis: Osteoporosis is defined as a systemic disorder of the skeleton which is characterized by low bone mass and micro-architectural deterioration of bone tissue with a consequent increase in bone fragility and susceptibility to fracture. Osteoporosis is a major national health problem which ...
... Osteoporosis: Osteoporosis is defined as a systemic disorder of the skeleton which is characterized by low bone mass and micro-architectural deterioration of bone tissue with a consequent increase in bone fragility and susceptibility to fracture. Osteoporosis is a major national health problem which ...
Stroke CT Angiography (CTA) - Vanderbilt University Medical Center
... our protocols typically call for the most rapid achievable gantry rotation rate. This can be as fast as 0.5 s per rotation on the newer 16-slice scanners. Moreover, spatial resolution in the z-direction is optimized by the acquisition of minimally thin slices, although image noise and quantum mottle ...
... our protocols typically call for the most rapid achievable gantry rotation rate. This can be as fast as 0.5 s per rotation on the newer 16-slice scanners. Moreover, spatial resolution in the z-direction is optimized by the acquisition of minimally thin slices, although image noise and quantum mottle ...
Imaging dose from cone beam computed tomography in radiation
... therapeutic and imaging interest. In the field of CBCT imaging dose calculations the EGSnrc code system, which includes the BEAMnrc and DOSXYZnrc codes, has been extensively used alongside other general purpose MC codes such as MCNP and Geant4 [48e51,58e71]. All publications found in our literature s ...
... therapeutic and imaging interest. In the field of CBCT imaging dose calculations the EGSnrc code system, which includes the BEAMnrc and DOSXYZnrc codes, has been extensively used alongside other general purpose MC codes such as MCNP and Geant4 [48e51,58e71]. All publications found in our literature s ...
Diagnostic Imaging Quality Assurance
... • Image intensifier measurements are at 0.1 µR and 0.1 µR/sec resolution; cine in µR/frame • Includes kVp and exposure time measurements when the Model 35050A is used with the Model 35080B Non-invasive kVp Divider • Optional Excel Add-in for remote operation, waveform capture, and calibration • Self ...
... • Image intensifier measurements are at 0.1 µR and 0.1 µR/sec resolution; cine in µR/frame • Includes kVp and exposure time measurements when the Model 35050A is used with the Model 35080B Non-invasive kVp Divider • Optional Excel Add-in for remote operation, waveform capture, and calibration • Self ...
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"".