Empirical equation for tissue-maximum ratios/scatter-maximum ratios for indirectly ionizing radiotherapy beams
- 1 January 1979
- journal article
- Published by Wiley in Medical Physics
- Vol. 6 (1), 65-67
- https://doi.org/10.1118/1.594553
Abstract
A six-parameter equation has been fitted to the tissue-maximum ratio/scatter maximum ration (TMR/SMR) tables for 60Co, 4-, 6-, and 10-MV photon beams as well as the 35 MeV d leads to Be neutron beam. The empirical equation has been shown to fit the 60Co 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.Keywords
Funding Information
- George Washington University
- National Cancer Institute (CA-17465)