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Physical characterization of 45‐MV photon beams for use in treatment planning
Author(s) -
Suntharalingam N.,
Steben John D.
Publication year - 1977
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.594391
Subject(s) - characterization (materials science) , photon , radiation treatment planning , medical imaging , dosimetry , medical physics , physics , optics , materials science , radiation therapy , computer science , medicine , nuclear medicine , artificial intelligence , radiology
Central‐axis percentage depth doses and tissue–maximum ratios (TMR) for 45‐MV photon beams from a betatron have been measured in water. Also the influence of field size and collimator scatter on the dose in the buildup region have been investigated. The maximum dose for TMR has been shown to occur at a point about 2 cm deeper than the maximum dose for percentage depth dose. This difference is significant in the characterization of the photon beam at this high energy. The measured physical data have been computerized for use in routine treatment planning. Computer‐generated beams have been found to be in close agreement with measured isodose curves. Computer‐generated isodose distributions for typical clinical irradiation techniques have been verified using RP/V film in an Alderson phantom.