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    Tissue standard ratios for irregularly shaped radiotherapy fields.

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    Authors
    Hounsell, Alan R
    Wilkinson, John M
    Affiliation
    Regional Department of Medical Physics and Bioengineering, Christie Hospital and Holt Radium Institute, Manchester.
    Issue Date
    1990-08
    
    Metadata
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    Abstract
    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 Radiol
    Journal
    The British Journal of Radiology
    URI
    http://hdl.handle.net/10541/109750
    DOI
    10.1259/0007-1285-63-752-629
    PubMed ID
    2119241
    Type
    Article
    Language
    en
    ISSN
    0007-1285
    ae974a485f413a2113503eed53cd6c53
    10.1259/0007-1285-63-752-629
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