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The influence of beam parameters on percentage depth dose in electron arc therapy
Author(s) -
Pla Marina,
Pla Conrado,
Podgorsak Ervin B.
Publication year - 1988
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 - 10.1118/1.596150
Subject(s) - isocenter , percentage depth dose curve , arc (geometry) , cathode ray , beam (structure) , optics , atomic physics , field size , electron , materials science , nuclear medicine , mathematics , physics , geometry , nuclear physics , ionization chamber , ion , medicine , imaging phantom , quantum mechanics , ionization
The dependence of rotational or arc electron beam percentage depth doses on the depth of isocenter d i and nominal beam field width w is presented. A characteristic angle β, which uniquely depends on w and d i , is defined and the dependence of the radial percentage depth doses on angle β discussed. It is shown that the characteristic angle β concept can be used in clinical situations to predict the shape of the percentage depth dose curve when w and d i are known, or, more importantly, it can be used to determine the appropriate w when d i and the percentage depth dose characteristics are known.