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A method for calculating megavoltage x‐ray dose and dose parameters
Author(s) -
Bagne Farideh
Publication year - 1980
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 - 10.1118/1.594721
Subject(s) - photon , range (aeronautics) , dosimetry , computational physics , physics , point (geometry) , ionization chamber , energy (signal processing) , nuclear medicine , optics , medical physics , mathematics , materials science , ionization , medicine , geometry , ion , quantum mechanics , composite material
Limitations of the most commonly used dose calculation methodologies as apply to medium and high‐energy x rays are discussed. A method is presented whereby the dose to a point in medium is divided into several components with expressions given for various components. The depth of transient‐charged particle equilibrium is chosen as the reference point. Equations are derived for calculating and relating the dose parameters including the percent depth dose, the tissue‐reference ratio, and the scatter‐reference ratio. Particular emphasis is placed on the accuracy and adequacy of the technique in the region of buildup. The applicability of the present method to megavoltage photons is established for a number of x‐ray beams in the range 4–45 MeV maximum energy.