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    A study on beam homogeneity for a Siemens Primus linac.

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    Authors
    Cutanda Henriquez, Francisco
    Vargas-Castrillón, Silvia T
    Affiliation
    NW Medical Physics, Christie Hospital NHS Trust, Withington, Manchester, UK. francisco.cutanda@physics.cr.man.ac.uk
    Issue Date
    2007-06
    
    Metadata
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    Abstract
    Asymmetric offset fields are an important tool for radiotherapy and their suitability for treatment should be assessed. Dose homogeneity for highly asymmetric fields has been studied for a Siemens PRIMUS clinical linear accelerator. Profiles and absolute dose have been measured in fields with two jaws at maximal position (20 cm) and the other two at maximal overtravel (10 cm), corresponding to 10 cm x 10 cm fields with extreme offset. Measured profiles have a marked decreasing gradient towards the beam edge, making these fields unsuitable for treatments. The flattening filter radius is smaller than the primary collimator aperture, and this creates beam inhomogeneities that affect large fields in areas far from the collimator axis, and asymmetric fields with large offset. The results presented assess the effect that the design of the primary collimator and flattening filter assembly has on beam homogeneity. This can have clinical consequences for treatments involving fields that include these inhomogeneous areas. Comparison with calculations from a treatment planning system, Philips Pinnacle v6.3, which computes under the hypotheses of a uniformly flattened beam, results in severe discrepancies.
    Citation
    A study on beam homogeneity for a Siemens Primus linac. 2007, 30 (2):147-51 Australas Phys Eng Sci Med
    Journal
    Australasian Physical & Engineering Sciences in Medicine
    URI
    http://hdl.handle.net/10541/71959
    PubMed ID
    17682405
    Type
    Article
    Language
    en
    ISSN
    0158-9938
    Collections
    All Christie Publications

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