Radiation Dose and Safety: Informatics Standards and Tools
... The CTDIvol is derived from several air kerma measurements made on a CT scanner using a cylindrical polymethyl methacrylate phantom that is 15 cm wide and either 16 cm or 32 cm in diameter. Measurements are made using a 100-mm pencil ionization chamber placed in holes at the center of the phantom an ...
... The CTDIvol is derived from several air kerma measurements made on a CT scanner using a cylindrical polymethyl methacrylate phantom that is 15 cm wide and either 16 cm or 32 cm in diameter. Measurements are made using a 100-mm pencil ionization chamber placed in holes at the center of the phantom an ...
The management of imaging dose during image-guided
... 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 during treatment, then pretreatment fluoroscopic studies m ...
... 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 during treatment, then pretreatment fluoroscopic studies m ...
The management of imaging dose during image-guided
... 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 during treatment, then pretreatment fluoroscopic studies m ...
... 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 during treatment, then pretreatment fluoroscopic studies m ...
Principles of CT: Multislice CT
... Six-slice and 8-slice models were introduced by manufacturers as cost-effective alternatives. At the same time, 32-slice and 40-slice scanners were being introduced. By 2005, 64-slice scanners were announced, and installations by most manufacturers began. Detector array designs used by several manuf ...
... Six-slice and 8-slice models were introduced by manufacturers as cost-effective alternatives. At the same time, 32-slice and 40-slice scanners were being introduced. By 2005, 64-slice scanners were announced, and installations by most manufacturers began. Detector array designs used by several manuf ...
A Study on Evaluation of kV-CBCT-image-based Treatment
... 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, just before delivery of each treatment. These pretre ...
... 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, just before delivery of each treatment. These pretre ...
The Effects of Organ-based Tube Current Modulation on Radiation
... [1], accounting for an increase by 23 times in the last three decades [2]. Recent advances in CT, including better image quality and reduced acquisition time, have facilitated an exponential growth in its clinical use over the past few years [3]. However, the Food and Drug Administration (FDA) estim ...
... [1], accounting for an increase by 23 times in the last three decades [2]. Recent advances in CT, including better image quality and reduced acquisition time, have facilitated an exponential growth in its clinical use over the past few years [3]. However, the Food and Drug Administration (FDA) estim ...
ENDODONTICS - American Association of Endodontists
... Most software provides for various nonaxial 2-D images in multiplanar reformation. Such MPR modes include oblique, curved planar reformation (providing “simulated” distortion-free panoramic images) and serial transplanar reformation (providing cross-sections), which can be used to highlight specific ...
... Most software provides for various nonaxial 2-D images in multiplanar reformation. Such MPR modes include oblique, curved planar reformation (providing “simulated” distortion-free panoramic images) and serial transplanar reformation (providing cross-sections), which can be used to highlight specific ...
12 Dynamic Contrast-Enhanced MRI of Prostate Cancer
... As discussed in Chap. 4 the assumptions necessary for reliable bolus tracking imaging are often not justified in tissues outside the brain. Indeed, near complete extraction of small molecular weight contrast agents may be observed on first passage through some tissues. ...
... As discussed in Chap. 4 the assumptions necessary for reliable bolus tracking imaging are often not justified in tissues outside the brain. Indeed, near complete extraction of small molecular weight contrast agents may be observed on first passage through some tissues. ...
Role of CTDI to estimate patient dose from a single slice to multi
... dose indices known as the Volume Computed Tomography Dose Index (CTDIvol) and dose length product (DLP) which are displayed on the CT scanner console. These values are obtained in the factory by scanning two acrylic cylinders (one with a 16-cm diameter, and the other with a 32-cm diameter) on a repr ...
... dose indices known as the Volume Computed Tomography Dose Index (CTDIvol) and dose length product (DLP) which are displayed on the CT scanner console. These values are obtained in the factory by scanning two acrylic cylinders (one with a 16-cm diameter, and the other with a 32-cm diameter) on a repr ...
PowerPoint-presentatie
... * 1927-1939: 75 publications. Mainly on plastic deformation and recrystallisation of metals, investigated by X-ray (hot lamp filaments after previous mechanical deformation – determines life time of light bulbs). Fundamental studies of these processes. * Role of lattice imperfections and dislocation ...
... * 1927-1939: 75 publications. Mainly on plastic deformation and recrystallisation of metals, investigated by X-ray (hot lamp filaments after previous mechanical deformation – determines life time of light bulbs). Fundamental studies of these processes. * Role of lattice imperfections and dislocation ...
Guideline for Radiation Safety in Interventional Cardiology - J
... Some types of radiation injuries have no clinical symptoms, and are hence undetectable without appropriate examination. Biologic effects resulting from radiation exposure are classified into stochastic effects and deterministic effects based on the difference between the dose-response relationships. ...
... Some types of radiation injuries have no clinical symptoms, and are hence undetectable without appropriate examination. Biologic effects resulting from radiation exposure are classified into stochastic effects and deterministic effects based on the difference between the dose-response relationships. ...
CT Dosimetry: Com- parison of Measure- ment
... All CTDI measurements made with a pencil ionization chamber are performed with a stationary patient table. To represent dose for a specific scan protocol, it is essential to take into account any gaps or overlaps between the radiation dose profiles from consecutive rotations of the x-ray source. For ...
... All CTDI measurements made with a pencil ionization chamber are performed with a stationary patient table. To represent dose for a specific scan protocol, it is essential to take into account any gaps or overlaps between the radiation dose profiles from consecutive rotations of the x-ray source. For ...
Chapter 4732 X-ray Definitions: Proposed Revisions to 4732.0110
... airline, railroad, and bus terminals and in similar facilities. An x-ray tube used within a shielded part of a building or x-ray equipment that may temporarily or occasionally incorporate portable shielding is not considered a cabinet x-ray system. Subp. 25. Calibration. "Calibration" means: a deter ...
... airline, railroad, and bus terminals and in similar facilities. An x-ray tube used within a shielded part of a building or x-ray equipment that may temporarily or occasionally incorporate portable shielding is not considered a cabinet x-ray system. Subp. 25. Calibration. "Calibration" means: a deter ...
guidelines for the use of radiographs in clinicalorthodontics
... enables dento-maxillofacial imaging with a lower exposure than conventional CT. Such machines are now readily available and are being promoted as 3D imaging techniques for the teeth and jaws. Some orthodontists are using them as part of orthodontic treatment planning and, although the exposure is us ...
... enables dento-maxillofacial imaging with a lower exposure than conventional CT. Such machines are now readily available and are being promoted as 3D imaging techniques for the teeth and jaws. Some orthodontists are using them as part of orthodontic treatment planning and, although the exposure is us ...
Radiological Protection in Paediatric Diagnostic and Interventional
... Brenner, D., Hall, E., 2007. Computed Tomography - An increasing source of radiation exposure. N Engl J Med 357(22), 2277-2284. UNSCEAR, 2008. Sources and Effects of Ionizing Radiation, UNSCEAR 2008 Report: Volume I: Sources – Report to the General Assembly Scientific Annexes A and B. ...
... Brenner, D., Hall, E., 2007. Computed Tomography - An increasing source of radiation exposure. N Engl J Med 357(22), 2277-2284. UNSCEAR, 2008. Sources and Effects of Ionizing Radiation, UNSCEAR 2008 Report: Volume I: Sources – Report to the General Assembly Scientific Annexes A and B. ...
x-ray safety manual - Winnipeg Regional Health Authority
... Safety Regulations. d) Managerial Controls: Roles of Administrative Managers, Medical Managers and Line Managers Local managerial control is crucial to the implementation of this policy. It should always be clear at local level which manager takes lead responsibility for each specific legal and oper ...
... Safety Regulations. d) Managerial Controls: Roles of Administrative Managers, Medical Managers and Line Managers Local managerial control is crucial to the implementation of this policy. It should always be clear at local level which manager takes lead responsibility for each specific legal and oper ...
ABDOMINAL EXAMINATION IN KNH USING 16 MULTI-SLICE
... indications were. The CT diagnostic findings were also analyzed in view of how they offered clinical solutions to the requesting clinician. Association between the specificity of the indication and the CT result was also studied. Dose quantification was done through estimation of effective dose, E c ...
... indications were. The CT diagnostic findings were also analyzed in view of how they offered clinical solutions to the requesting clinician. Association between the specificity of the indication and the CT result was also studied. Dose quantification was done through estimation of effective dose, E c ...
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 ...
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 ...
Trends in Dental Radiography Equipment and Patient Dose in the
... The Dental X-ray Protection Services group (DXPS) of the Health Protection Agency (HPA) carries out equipment performance tests on all forms of dental radiography equipment in the UK and Republic of Ireland. In 2007, a review of data collected by DXPS between 2002 and 2004 was presented which provid ...
... The Dental X-ray Protection Services group (DXPS) of the Health Protection Agency (HPA) carries out equipment performance tests on all forms of dental radiography equipment in the UK and Republic of Ireland. In 2007, a review of data collected by DXPS between 2002 and 2004 was presented which provid ...
The Measurement, Reporting, and Management of
... technologies; for consistency, the term “helical” will be used throughout). The introduction of dual-slice systems in 1994 and multislice systems in 1998 (four detector arrays along the z-axis) has further accelerated the implementation of many new clinical applications1–3. The number of slices, or ...
... technologies; for consistency, the term “helical” will be used throughout). The introduction of dual-slice systems in 1994 and multislice systems in 1998 (four detector arrays along the z-axis) has further accelerated the implementation of many new clinical applications1–3. The number of slices, or ...
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 ...
Adult Brain Tumors - Neuroimaging Clinics of North America
... lesion if there is a partial volume effect with the adjacent parenchyma. For discriminating solitary metastases from primary high-grade tumors, it has been suggested that investigation of perienhancing tumor regions is useful. Metastases are encapsulated and do not show high Cho levels outside the r ...
... lesion if there is a partial volume effect with the adjacent parenchyma. For discriminating solitary metastases from primary high-grade tumors, it has been suggested that investigation of perienhancing tumor regions is useful. Metastases are encapsulated and do not show high Cho levels outside the r ...
Code of Practice for Diagnostic and Interventional Radiology: Draft
... Secondary shielding – 1.5 mm lead equivalence in X-ray rooms where computed tomography equipment is performed, 18 mm gypsum plasterboard equivalence in all X-ray rooms where mammography or dual energy X-ray absorptiometry is performed and 1.0 mm lead equivalence for all other X-ray rooms. Supervised ...
... Secondary shielding – 1.5 mm lead equivalence in X-ray rooms where computed tomography equipment is performed, 18 mm gypsum plasterboard equivalence in all X-ray rooms where mammography or dual energy X-ray absorptiometry is performed and 1.0 mm lead equivalence for all other X-ray rooms. Supervised ...
Proton therapy
Proton therapy or proton beam therapy is a medical procedure, a type of particle therapy that uses a beam of protons to irradiate diseased tissue, most often in the treatment of cancer. Proton therapy's chief advantage over other types of external beam radiotherapy is that as a charged particle the dose is deposited over a narrow range and there is minimal exit dose.