Radiology
... Hyperthermia • Use of heat in conjunction with radiation therapy • Investigational – Some policies allow for deep hyperthermia with radiation therapy while considering superficial hyperthermia investigational ...
... Hyperthermia • Use of heat in conjunction with radiation therapy • Investigational – Some policies allow for deep hyperthermia with radiation therapy while considering superficial hyperthermia investigational ...
X-ray phase-contrast CO 2 angiography for sub
... compared to simulated profiles in a range of diameters with 100 nm increments. For each simulated diameter different relative translations of the profiles are tested to find the minimum root-mean-square error. The vessel diameter giving the least such error is considered to be the diameter of the ve ...
... compared to simulated profiles in a range of diameters with 100 nm increments. For each simulated diameter different relative translations of the profiles are tested to find the minimum root-mean-square error. The vessel diameter giving the least such error is considered to be the diameter of the ve ...
Article in PDF
... of brain tumors, complex tumor morphology, and their treatment protocol including chemotherapy or radiotherapy makes radiological assessment in discriminating tumor recurrence from the inflammatory or necrotic change due to treatment with radiation and/or chemotherapy. Both of these entities typical ...
... of brain tumors, complex tumor morphology, and their treatment protocol including chemotherapy or radiotherapy makes radiological assessment in discriminating tumor recurrence from the inflammatory or necrotic change due to treatment with radiation and/or chemotherapy. Both of these entities typical ...
Trends in Dental Radiography Equipment and Patient Dose in the
... standard exposure factors for a range of radiographic images is also obtained from a questionnaire which is completed by the person carrying out the test. As the NRDs are set for an intra-oral mandibular molar radiograph and a standard adult panoramic radiograph, patient entrance doses for these rad ...
... standard exposure factors for a range of radiographic images is also obtained from a questionnaire which is completed by the person carrying out the test. As the NRDs are set for an intra-oral mandibular molar radiograph and a standard adult panoramic radiograph, patient entrance doses for these rad ...
Radiation Protection in Digital Radiology - RPOP
... anatomical area. Once the image is acquired, numerical methods (i.e. software) may automatically crop part of the image, and when the image is received for reading the radiologist will not be aware that a larger anatomical area than necessary was irradiated. • Select the correct pre-programmed techn ...
... anatomical area. Once the image is acquired, numerical methods (i.e. software) may automatically crop part of the image, and when the image is received for reading the radiologist will not be aware that a larger anatomical area than necessary was irradiated. • Select the correct pre-programmed techn ...
Imaging dose from cone beam computed tomography in radiation
... an arc beam of 6 MV photons. This has been done by several groups, indicating its feasibility and the ability of including MV CBCT dose in treatment planning [54,55]. The Siemens units, however, have the capability of cone beam imaging using two other modalities: 1) An “Imaging Beam Line” or IBL, wh ...
... an arc beam of 6 MV photons. This has been done by several groups, indicating its feasibility and the ability of including MV CBCT dose in treatment planning [54,55]. The Siemens units, however, have the capability of cone beam imaging using two other modalities: 1) An “Imaging Beam Line” or IBL, wh ...
Construction of mouse phantoms from segmented CT
... absorbed dose in different regions of interest. However, even with these advanced computer models and numerical methods there are still limitations to the complexity and number of interactions which can be computed. When systems become very complex, such as in radiation biophysics, computational pha ...
... absorbed dose in different regions of interest. However, even with these advanced computer models and numerical methods there are still limitations to the complexity and number of interactions which can be computed. When systems become very complex, such as in radiation biophysics, computational pha ...
Cone beam-computed tomography applications in endodontics: A
... facilitates right treatment plan and prognosis.[29] 6. CBCT can be used for the diagnosis of vertical root fracture line. VRF is a fracture line, which takes place along the long axis of the tooth and often created as a result of latrogenic injury during dentistry treatment.[30] In most cases, VRF w ...
... facilitates right treatment plan and prognosis.[29] 6. CBCT can be used for the diagnosis of vertical root fracture line. VRF is a fracture line, which takes place along the long axis of the tooth and often created as a result of latrogenic injury during dentistry treatment.[30] In most cases, VRF w ...
Surface radiation balance in Antarctica as measured with automatic
... year. The highest annual mean surface temperature occurs at AWS 5, in spite of the fact that this station is situated about 330 m higher than AWS 4. The reason is that the surface at AWS 5 and 6 has a significant slope, which forces katabatic winds that mix relatively warm air downward to the surfac ...
... year. The highest annual mean surface temperature occurs at AWS 5, in spite of the fact that this station is situated about 330 m higher than AWS 4. The reason is that the surface at AWS 5 and 6 has a significant slope, which forces katabatic winds that mix relatively warm air downward to the surfac ...
guidelines for the use of radiographs in clinicalorthodontics
... X-RAYS, and their ability to penetrate human tissue to create a visual image, were discovered by Wilhelm Röntgen in 1895. Within weeks of their discovery the first dental radiographic images were created. Within months medical diagnostic imaging had been revolutionised. These early images required h ...
... X-RAYS, and their ability to penetrate human tissue to create a visual image, were discovered by Wilhelm Röntgen in 1895. Within weeks of their discovery the first dental radiographic images were created. Within months medical diagnostic imaging had been revolutionised. These early images required h ...
Controlling exposure to ionising radiation in the medical imaging
... insufficient operator training and secondly to a shortage of medical physicists and suitable equipment for this type of procedure. It also highlights deficiencies in the knowledge of the radiation doses delivered during the procedures and of the obligation to notify significant radiation protection ...
... insufficient operator training and secondly to a shortage of medical physicists and suitable equipment for this type of procedure. It also highlights deficiencies in the knowledge of the radiation doses delivered during the procedures and of the obligation to notify significant radiation protection ...
Safety Reports Series No.59
... 1. Radiation — Safety measures. 2. Diagnosis, Radioscopic — Safety measures. 3. Radiation dosimetry. I. International Atomic Energy Agency. II. Series. IAEAL ...
... 1. Radiation — Safety measures. 2. Diagnosis, Radioscopic — Safety measures. 3. Radiation dosimetry. I. International Atomic Energy Agency. II. Series. IAEAL ...
High-dose MVCT image guidance for stereotactic body
... CT;13 particularly when localizing treatment sites in the abdomen. This is of special concern for SBRT treatments, where doses of up to 20 Gy are delivered in a single fraction. This issue is not unique to TomoTherapy, rather it is a common problem among all MV imaging systems.13–15 The ability to r ...
... CT;13 particularly when localizing treatment sites in the abdomen. This is of special concern for SBRT treatments, where doses of up to 20 Gy are delivered in a single fraction. This issue is not unique to TomoTherapy, rather it is a common problem among all MV imaging systems.13–15 The ability to r ...
Cervical Cancer Brachytherapy Task Group
... the parametrial boost portion of treatment. Brachytherapy may be initiated earlier, but no earlier than approximately 20 Gy, if the physician determines that the applicator placed at this time point would provide adequate tumor coverage and sparing of normal tissues. Alternatively, if 45 Gy is deliv ...
... the parametrial boost portion of treatment. Brachytherapy may be initiated earlier, but no earlier than approximately 20 Gy, if the physician determines that the applicator placed at this time point would provide adequate tumor coverage and sparing of normal tissues. Alternatively, if 45 Gy is deliv ...
Evaluation and Validation of Computed Tomography Dose Accuracy
... from the two techniques. Tube currents of 140 mAs, 240 mAs and 300 mAs yielded 3.5%, 0.61% and -6.45% deviations when the respective CTDIvol values for both techniques were compared. There were mean CTDIvol of (42.3 + 8.6) mGy and (42.1 + 8.1) mGy for Barracuda and Ion Chamber techniques respectivel ...
... from the two techniques. Tube currents of 140 mAs, 240 mAs and 300 mAs yielded 3.5%, 0.61% and -6.45% deviations when the respective CTDIvol values for both techniques were compared. There were mean CTDIvol of (42.3 + 8.6) mGy and (42.1 + 8.1) mGy for Barracuda and Ion Chamber techniques respectivel ...
Growth and gas exchange in field-grown and greenhouse
... Ultraviolet-B radiation treatments—greenhouse experiment Supplemental UV-B radiation was supplied over a 10-h period centered on solar noon with Q-Panel UV-B-313 fluorescent lamps (Q-Panel, Cleveland, OH) mounted in metal frames suspended above the pots and filtered with 0.13 mm cellulose diacetate ...
... Ultraviolet-B radiation treatments—greenhouse experiment Supplemental UV-B radiation was supplied over a 10-h period centered on solar noon with Q-Panel UV-B-313 fluorescent lamps (Q-Panel, Cleveland, OH) mounted in metal frames suspended above the pots and filtered with 0.13 mm cellulose diacetate ...
13 Definition of Target Volume and Organs at Risk. Biological Target
... radiation treatment. But also the technique used for irradiation, including the patient’s positioning and fixation, are of major importance. As a consequence, the complexity of the process when defining the target volume requires sound clinical judgement and knowledge from the radiation oncologist. Th ...
... radiation treatment. But also the technique used for irradiation, including the patient’s positioning and fixation, are of major importance. As a consequence, the complexity of the process when defining the target volume requires sound clinical judgement and knowledge from the radiation oncologist. Th ...
12 Patient Immobilization and Image Guidance
... covered by the prescription dose as by the PTV. Note however that the actual region in space corresponding to each volume is, in general, not identical even if CI = 1.0 (the prescription dose volume may be a different shape to, or offset from, the PTV), so the dose distribution must be examined alon ...
... covered by the prescription dose as by the PTV. Note however that the actual region in space corresponding to each volume is, in general, not identical even if CI = 1.0 (the prescription dose volume may be a different shape to, or offset from, the PTV), so the dose distribution must be examined alon ...
SBRT: AAPM Task Group 101 Report
... This vendor safety notice warns against two specific issues for potential inaccurate dose computation due to: 1. Use of conditions that require extrapolation of data beyond measurement range 2. Use of large grid size resulting in unexpected results for small structures Recommendation (TG 101): S ...
... This vendor safety notice warns against two specific issues for potential inaccurate dose computation due to: 1. Use of conditions that require extrapolation of data beyond measurement range 2. Use of large grid size resulting in unexpected results for small structures Recommendation (TG 101): S ...
AAPM REPORT NO. 54 STEREOTACTIC RADIOSURGERY Report
... (1992), and Podgorsak et al. (1987, 1988, 1989, 1990, and 1992). SRS generally consists of identifying a target in the patient's brain that is to be irradinted by the intersection of one or more heavy charged particle beams, by multiple noncoplanar arcs with a linac, by dynamic rotation with a linac ...
... (1992), and Podgorsak et al. (1987, 1988, 1989, 1990, and 1992). SRS generally consists of identifying a target in the patient's brain that is to be irradinted by the intersection of one or more heavy charged particle beams, by multiple noncoplanar arcs with a linac, by dynamic rotation with a linac ...
Phylogenetic Insights on Adaptive Radiation
... stage in the evolution of the vertebrate eye does not trivialize natural selection. If it can be shown that diversification among closely related species tends to result from adaptive radiation, it may be reasonable to suggest that earlier diversification events involved the same process and perhaps e ...
... stage in the evolution of the vertebrate eye does not trivialize natural selection. If it can be shown that diversification among closely related species tends to result from adaptive radiation, it may be reasonable to suggest that earlier diversification events involved the same process and perhaps e ...
Chapter 4732 X-ray Definitions: Proposed Revisions to 4732.0110
... component parts, and accessories that uses electronically produced ionizing radiation to determine the density of bone structures of human patients. Subp. 23. C-arm fluoroscope system. "C-arm fluoroscope system" means an a fluoroscopic x-ray system in which the image receptor and the x-ray tube hous ...
... component parts, and accessories that uses electronically produced ionizing radiation to determine the density of bone structures of human patients. Subp. 23. C-arm fluoroscope system. "C-arm fluoroscope system" means an a fluoroscopic x-ray system in which the image receptor and the x-ray tube hous ...
The possibilities of reducing radiation dose and improve image
... Radiation Protection (ICRP) states that for doses of 100 mSv and higher, there is epidemiologic proven risk for radiation related cancer induction, and that there is no rational for assuming a low-dose threshold for cancer induction. In radiation protection management, it is therefore a general assu ...
... Radiation Protection (ICRP) states that for doses of 100 mSv and higher, there is epidemiologic proven risk for radiation related cancer induction, and that there is no rational for assuming a low-dose threshold for cancer induction. In radiation protection management, it is therefore a general assu ...
Evaluation of Linear Accelerator Gating with Real
... Another factor limiting this technique is that, if used simultaneously, high-energy megavoltage scatter from the treatment beam can degrade the image quality of the kilovoltage images used for tracking (20). Imaging-based methods have the advantage of providing information about the surrounding tiss ...
... Another factor limiting this technique is that, if used simultaneously, high-energy megavoltage scatter from the treatment beam can degrade the image quality of the kilovoltage images used for tracking (20). Imaging-based methods have the advantage of providing information about the surrounding tiss ...
chapter 7. clinical treatment planning in external photon
... The external shape of the patient must be outlined for all areas where the beams enter and exit (for contour corrections) and in the adjacent areas (to account for scattered radiation). Targets and internal structures must be outlined in order to determine their shape and volume for dose calculation ...
... The external shape of the patient must be outlined for all areas where the beams enter and exit (for contour corrections) and in the adjacent areas (to account for scattered radiation). Targets and internal structures must be outlined in order to determine their shape and volume for dose calculation ...
Radiation burn
A radiation burn is damage to the skin or other biological tissue caused by exposure to radiation. The radiation types of greatest concern are thermal radiation, radio frequency energy, ultraviolet light and ionizing radiation.The most common type of radiation burn is a sunburn caused by UV radiation. High exposure to X-rays during diagnostic medical imaging or radiotherapy can also result in radiation burns. As the ionizing radiation interacts with cells within the body—damaging them—the body responds to this damage, typically resulting in erythema—that is, redness around the damaged area. Radiation burns are often associated with radiation-induced cancer due to the ability of ionizing radiation to interact with and damage DNA, occasionally inducing a cell to become cancerous. Cavity magnetrons can be improperly used to create surface and internal burning. Depending on the photon energy, gamma radiation can cause very deep gamma burns, with 60Co internal burns are common. Beta burns tend to be shallow as beta particles are not able to penetrate deep into the person; these burns can be similar to sunburn.Radiation burns can also occur with high power radio transmitters at any frequency where the body absorbs radio frequency energy and converts it to heat. The U.S. Federal Communications Commission (FCC) considers 50 watts to be the lowest power above which radio stations must evaluate emission safety. Frequencies considered especially dangerous occur where the human body can become resonant, at 35 MHz, 70 MHz, 80-100 MHz, 400 MHz, and 1 GHz. Exposure to microwaves of too high intensity can cause microwave burns.