Empirical equation for tissue‐maximum ratios/scatter‐maximum ratios for indirectly ionizing radiotherapy beams | Zendy

Schell M. C. | Zendy; Deye J. A. | Zendy

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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.

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