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Empirical equation for tissue‐maximum ratios/scatter‐maximum ratios for indirectly ionizing radiotherapy beams
Author(s) -
Schell M. C.,
Deye J. A.
Publication year - 1979
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 - 10.1118/1.594553
Subject(s) - dosimetry , extrapolation , physics , photon , radiation , ionizing radiation , beam (structure) , computational physics , optics , nuclear physics , nuclear medicine , materials science , atomic physics , irradiation , mathematics , statistics , medicine
A six‐parameter equation has been fitted to the tissue‐maximum ratio/scatter maximum ration (TMR/SMR) tables for 60 Co, 4‐, 6‐, and 10‐MV photon beams as well as the 35‐MeV d→Be neutron beam. The empirical equation has been shown to fit the 60 Co tissue–air ratio/scatter–air ratio (TAR/SAR) data equally well. The TMR/SMR model was developed from a three‐parameter equation designed to eliminate the graphical extrapolation of zero‐field size TARs.