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Computed tomography--an increasing source of radiation exposure.
... this subgroup was about 40 mSv, which approximates the relevant organ dose from a typical CT study involving two or three scans in an adult. Although most of the quantitative estimates of the radiation-induced cancer risk are derived from analyses of atomic-bomb survivors, there are other supporting ...
... this subgroup was about 40 mSv, which approximates the relevant organ dose from a typical CT study involving two or three scans in an adult. Although most of the quantitative estimates of the radiation-induced cancer risk are derived from analyses of atomic-bomb survivors, there are other supporting ...
Webb, Ch.2s5
... The choice of the tube potential and filtration most appropriate to a particular application will be a compromise between contrast and dose, as explained in §2.4. As we have seen already, we cannot reduce the dose to a very low level because of the noise in the image and it is possible to use this f ...
... The choice of the tube potential and filtration most appropriate to a particular application will be a compromise between contrast and dose, as explained in §2.4. As we have seen already, we cannot reduce the dose to a very low level because of the noise in the image and it is possible to use this f ...
The American Society for Radiation Oncology`s 2010 Core
... Results: The new curriculum resulted in a recommended 56-h course, excluding initial orientation. Learning objectives are provided for each subject area, and a detailed outline of material to be covered is given for each lecture hour. Some recent changes in the curriculum include the addition of Rad ...
... Results: The new curriculum resulted in a recommended 56-h course, excluding initial orientation. Learning objectives are provided for each subject area, and a detailed outline of material to be covered is given for each lecture hour. Some recent changes in the curriculum include the addition of Rad ...
Applied Physics Radiation Oncology
... Localization, or simulation, is the radiographic determination of the field borders required to encompass the clinical target volume. Ideally, localization is performed using a simulator—radiographic (imaging) unit that simulates all the movements of the linear accelerator or Cobalt-60 treatment uni ...
... Localization, or simulation, is the radiographic determination of the field borders required to encompass the clinical target volume. Ideally, localization is performed using a simulator—radiographic (imaging) unit that simulates all the movements of the linear accelerator or Cobalt-60 treatment uni ...
New Agents and Techniques for Imaging Prostate Cancer
... treatment. Imaging of prostate cancer has become increasingly important to predict which cancers are indolent and which will become aggressive as the treatment may be different for different grades of the disease. Different modalities have been tested to diagnose prostate cancer accurately, stage it ...
... treatment. Imaging of prostate cancer has become increasingly important to predict which cancers are indolent and which will become aggressive as the treatment may be different for different grades of the disease. Different modalities have been tested to diagnose prostate cancer accurately, stage it ...
ACR–AAPM Technical Standard for Medical Physics Performance
... Imaging has been used to verify the patient position since the earliest days of external beam radiation therapy (EBRT). The first methods of imaging internal anatomy to verify the patient’s position on the treatment couch used the treatment beam to expose radiographic film. These images are called p ...
... Imaging has been used to verify the patient position since the earliest days of external beam radiation therapy (EBRT). The first methods of imaging internal anatomy to verify the patient’s position on the treatment couch used the treatment beam to expose radiographic film. These images are called p ...
9 Three-Dimensional Treatment Planning and Conformal Therapy
... other critical normal organs. Powerful X-ray CTsimulation and three-dimensional treatment-planning systems (3D TPS) have now been commercially available for over a decade and have replaced the conventional radiation therapy X-ray simulator and two-dimensional (2D) dose-planning process in modern-day ...
... other critical normal organs. Powerful X-ray CTsimulation and three-dimensional treatment-planning systems (3D TPS) have now been commercially available for over a decade and have replaced the conventional radiation therapy X-ray simulator and two-dimensional (2D) dose-planning process in modern-day ...
Limitations of RECIST guidelines
... Limitations of RECIST guidelines Srinivasa R Prasad MD Associate Professor, Radiology University of Texas Health Science Center at San Antonio ...
... Limitations of RECIST guidelines Srinivasa R Prasad MD Associate Professor, Radiology University of Texas Health Science Center at San Antonio ...
Cécile BOPP Le proton : sonde dosimétrique et diagnostique
... 1.1.2.3 Dependence of the phase in the cell cycle . . . . . . 1.1.2.4 In brief... . . . . . . . . . . . . . . . . . . . . . . . . 1.1.3 Clinical trials, cost and cost-effectiveness . . . . . . . . . . . 1.1.3.1 Protons . . . . . . . . . . . . . . . . . . . . . . . . . 1.1.3.2 Carbon ions . . . . . . ...
... 1.1.2.3 Dependence of the phase in the cell cycle . . . . . . 1.1.2.4 In brief... . . . . . . . . . . . . . . . . . . . . . . . . 1.1.3 Clinical trials, cost and cost-effectiveness . . . . . . . . . . . 1.1.3.1 Protons . . . . . . . . . . . . . . . . . . . . . . . . . 1.1.3.2 Carbon ions . . . . . . ...
Image Guided Radiation Therapy: A Refresher
... i reduction d i for f most RT treatments. … facilitate implementation of new RT techniques (eg, (eg liver and lung SBRT) 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 importan ...
... i reduction d i for f most RT treatments. … facilitate implementation of new RT techniques (eg, (eg liver and lung SBRT) 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 importan ...
Cone Beam CT guided Radiotherapy
... • Patient set-up is monitored with CBCT for most of our patient groups, using a decision protocol based on bony anatomy match • Radiotherapy technicians perform the acquisition, registration and evaluation (bony anatomy) • Soft-tissue registrations performed by dedicated radiotherapy technicians in ...
... • Patient set-up is monitored with CBCT for most of our patient groups, using a decision protocol based on bony anatomy match • Radiotherapy technicians perform the acquisition, registration and evaluation (bony anatomy) • Soft-tissue registrations performed by dedicated radiotherapy technicians in ...
Generation of Hard Quasimonochromatic Radiation Using a Table
... organic materials Concern Radiation-induced damage: photon energy deposited per unit mass (dose) can cause observable changes in structure ...
... organic materials Concern Radiation-induced damage: photon energy deposited per unit mass (dose) can cause observable changes in structure ...
Y-90 SIRT in the Liver - Emory Radiology
... Use the following tables to select a dose size where the Desired Dose (above) is at a suitable treatment time. Optional field for Medical Professional to document treatment dose selected Dose Size Selected (GBq): Date & Time for Administration: Optional field for Medical Professional to document tre ...
... Use the following tables to select a dose size where the Desired Dose (above) is at a suitable treatment time. Optional field for Medical Professional to document treatment dose selected Dose Size Selected (GBq): Date & Time for Administration: Optional field for Medical Professional to document tre ...
Computed Tomography
... Computed tomography (CT) is a medical imaging method employing tomography. The word "tomography" is derived from the Greek tomos (slice) and graphein (to write). A large series of two-dimensional X-ray images (slices) of the inside of an object are taken around a single axis of rotation. Digital geo ...
... Computed tomography (CT) is a medical imaging method employing tomography. The word "tomography" is derived from the Greek tomos (slice) and graphein (to write). A large series of two-dimensional X-ray images (slices) of the inside of an object are taken around a single axis of rotation. Digital geo ...
A case reportof the cervix
... Rationale: brachytherapy is administered in the treatment of patients with locally advanced cervical cancer following chemoradiotherapy. Lack of local anatomy evaluation prior to this procedure might lead to the selection of an inappropriate brachytherapy applicator, increasing the risk of side effe ...
... Rationale: brachytherapy is administered in the treatment of patients with locally advanced cervical cancer following chemoradiotherapy. Lack of local anatomy evaluation prior to this procedure might lead to the selection of an inappropriate brachytherapy applicator, increasing the risk of side effe ...
Proton Spectroscopic and Dynamic Contrast
... ability of MRSI to provide noninvasive tissue characterization of brain tumours. This optimistic terminology is not yet appropriate for prostatic MRSI, which is sustained by a limited number of validated studies [5]. MRSI may be used to stratify patients with a high and low probability of a subseque ...
... ability of MRSI to provide noninvasive tissue characterization of brain tumours. This optimistic terminology is not yet appropriate for prostatic MRSI, which is sustained by a limited number of validated studies [5]. MRSI may be used to stratify patients with a high and low probability of a subseque ...
Modul 1_Radiologycal diagnostic and therapy
... Name a method of radial therapy at which use the radiation source can rotate around the patient A. Therapy by a break radiation of high energies B. Selective accumulation of an isotope C. Intracavitary beta-ray therapy D. Short-distance gamma therapy E. * Long-distance gamma therapy Specify philosop ...
... Name a method of radial therapy at which use the radiation source can rotate around the patient A. Therapy by a break radiation of high energies B. Selective accumulation of an isotope C. Intracavitary beta-ray therapy D. Short-distance gamma therapy E. * Long-distance gamma therapy Specify philosop ...
Radiation Safety - Society for Cardiovascular Angiography and
... “Dose” a measure of energy absorbed by tissue. The dose delivered to the pt is derived from the X-ray photons that enter but do not leave. ...
... “Dose” a measure of energy absorbed by tissue. The dose delivered to the pt is derived from the X-ray photons that enter but do not leave. ...
CT Simulation Refresher Course Sasa Mutic, MS
... by delineator wires. Using primarily bony landmarks a physician outlines areas to receive therapeutic radiation doses. One shortcoming of a conventional simulation process is that very little anatomy, other than bony anatomy, is available for design of treatment portals. CT images provide informatio ...
... by delineator wires. Using primarily bony landmarks a physician outlines areas to receive therapeutic radiation doses. One shortcoming of a conventional simulation process is that very little anatomy, other than bony anatomy, is available for design of treatment portals. CT images provide informatio ...
Inclusion of the dose from kilovoltage cone beam CT in the radiation
... values in the table are obtained by multiplying the PINNACLE “computed dose” values by the ratio of bone/water mass energy absorption coefficients obtained from Table X of AAPM Task Group 61 report,17 assuming a 5.4 mm HVL for the 125 kVp beam measured before.10 As seen in the table, this results in ...
... values in the table are obtained by multiplying the PINNACLE “computed dose” values by the ratio of bone/water mass energy absorption coefficients obtained from Table X of AAPM Task Group 61 report,17 assuming a 5.4 mm HVL for the 125 kVp beam measured before.10 As seen in the table, this results in ...
Radiation protection in the cathlab
... (CA, PTCA, RF ablations, ICD, DSA, PTA, embolisations,…) are high-dose procedures (1-100 mSv/h scattered dose rate @30 cm from patient) • Both physical and technical parameters may have an influence on patient and staff dose. • Good radiation protection policy and personnel skill are essential for r ...
... (CA, PTCA, RF ablations, ICD, DSA, PTA, embolisations,…) are high-dose procedures (1-100 mSv/h scattered dose rate @30 cm from patient) • Both physical and technical parameters may have an influence on patient and staff dose. • Good radiation protection policy and personnel skill are essential for r ...
12 Patient Immobilization and Image Guidance
... OARsor critical normal structures as they are often referred toare “normal tissues…whose radiation sensitivity may significantly influence treatment planning and/or prescription dose” (ICRU 1999). The actual tolerance doses and volume effects concerning these tissues are discussed in more detail i ...
... OARsor critical normal structures as they are often referred toare “normal tissues…whose radiation sensitivity may significantly influence treatment planning and/or prescription dose” (ICRU 1999). The actual tolerance doses and volume effects concerning these tissues are discussed in more detail i ...
Beam Restricting Devices
... of scatter radiation that is created as a result of Compton’s interaction with the body’s tissues. Scatter hinders the visualization of detail by adding additional density to the radiographic image. Scatter is also responsible for increasing the patient’s radiation dosage, decreasing image contrast ...
... of scatter radiation that is created as a result of Compton’s interaction with the body’s tissues. Scatter hinders the visualization of detail by adding additional density to the radiographic image. Scatter is also responsible for increasing the patient’s radiation dosage, decreasing image contrast ...
Proton therapy
![](https://commons.wikimedia.org/wiki/Special:FilePath/MayoProton.jpg?width=300)
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.