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Obliquity correction for electron beams
Author(s) -
Khan Faiz M.,
Deibel Firmin C.,
SoleimaniMeigooni Ali
Publication year - 1985
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 - 10.1118/1.595659
Subject(s) - dosimetry , beam (structure) , inverse square law , range (aeronautics) , cathode ray , physics , electron , optics , square (algebra) , radiation treatment planning , computational physics , nuclear physics , nuclear medicine , mathematics , geometry , engineering , classical mechanics , radiation therapy , aerospace engineering , medicine , gravitation
Uneven air gaps, beam obliquity, or sloping contours create complex dosimetry problems in electron beam treatment planning. We find that the depth dose distribution in an obliquely incident beam can be calculated from the data for a normally incident beam by using inverse square law and obliquity factors. The obliquity factors have been determined for various energy beams in the range of 6–22 MeV and can be used for manual treatment planning.