skin dose वाक्य
उदाहरण वाक्य
मोबाइल
- The thickness of bolus applied is dependent on the skin dose required and the angle of incidence of the treatment beams.
- The relationship between cumulative skin dose and peak skin dose is highly variable, as has been demonstrated in a number of publications.
- The relationship between cumulative skin dose and peak skin dose is highly variable, as has been demonstrated in a number of publications.
- A typical example of this is the application of a defined thickness of bolus to a chest wall for post-mastectomy chest wall treatment, to increase the skin dose.
- Megavoltage x-rays are preferred for treatment of deep lying tumours as they are attenuated less than lower energy photons, and will penetrate further, with a lower skin dose.
- Radiation doses to the patient depend greatly on the size of the patient as well as length of the procedure, with typical skin dose rates quoted as 20 50 mGy / min.
- Because of shielding by the tissue surrounding the bones, the bone marrow only receives about 0.67 cGy when the air exposure is 1 r�ntgen and the surface skin dose is 1 cGy.
- However, these systems, known as dose-area-product meters ( DAP meters ), do not directly provide skin dose information without further knowledge of the sizes of the x-ray beam during the entire procedure.
- In May 2010 the National Council on Radiation Protection and Measurements issued a press release in response to the health risk claims from UCSF and Columbia University ( claims of excessive skin dose and risks to large populations vs . individuals ).
- Dr . Steve Smith, inventor of the body scanner in 1991, and president of Tek84, one of the companies that produces the machines, has stated that the concerns of Dr . Brenner and UCSF Scientists regarding the skin dose of backscatter scanners is incorrect.
- More importantly, using a transmission target with typically a thin film attached to a Be end-window, the thin target film also serves a filter function to screen out low energy photons and reduces the skin dose as well as transforms most high energy brems to fluorescent line-emissions characteristic to the target material ( s ).
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