Tissue standard ratios for irregularly shaped radiotherapy fields.
Affiliation
Regional Department of Medical Physics and Bioengineering, Christie Hospital and Holt Radium Institute, Manchester.Issue Date
1990-08
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Show full item recordAbstract
A method of calculating dose for a 6 MV X-ray beam using tissue standard ratios (TSR) is described. TSRs may be divided into a primary component and a scatter component, and the latter can then be further divided into contributions from elemental scattering volumes of 1 cm x 1 cm cross-sectional area at 1 m from the source. The magnitude of the various components have been determined by analysing measurements of square and rectangular fields, involving the fitting of the scatter data to an exponential function of radial distance from the scatter element. The coefficient and exponent of this function were found to be functions of depth, and this variation is described. A method of utilizing reconstructed scatter data that is compatible with the motion of a multileaf collimator system is presented. Results obtained by re-combining the data for various non-standard geometries are compared with further experimental work.Citation
Tissue standard ratios for irregularly shaped radiotherapy fields. 1990, 63 (752):629-34 Br J RadiolJournal
The British Journal of RadiologyDOI
10.1259/0007-1285-63-752-629PubMed ID
2119241Type
ArticleLanguage
enISSN
0007-1285ae974a485f413a2113503eed53cd6c53
10.1259/0007-1285-63-752-629
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