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    An experimental investigation of the tongue and groove effect for the Philips multileaf collimator.

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    Authors
    Sykes, Jonathan R
    Williams, Peter C
    Affiliation
    North Western Medical Physics Department, Christie Hospital NHS Trust, Manchester, UK. prsjrs@dalpha2.cr.man.uk
    Issue Date
    1998-10
    
    Metadata
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    Abstract
    The tongue and groove effect is an underdosing effect which can occur in certain applications of multileaf collimators. It results from the need to overlap adjacent leaves of a multileaf collimator in order to limit leakage between leaves. The applications in which the effect can occur are the abutment of fields where the beam edges are defined by the leaf edge and the production of intensity-modulated fields by dynamic collimation. The effect has been measured for the 'worst case' when just two MLC fields are matched along leaf edges which have overlapping steps. Measurements of the dose have been made at d(max) and also at a more clinically relevant depth of 87 mm in Perspex for beam energies of 6 MV, 8 MV and 20 MV on two Philips SL series accelerators. Dose distributions were recorded on radiographic film which was subsequently digitized for analysis. The dose reduction of the tongue and groove effect was found to be 15-28% and spread over a width of 3.8 to 4.2 mm. This is somewhat shallower and wider than would be expected from a simple, idealized model of the effect which would predict a dose reduction of 80% over a width of 1 mm.
    Citation
    An experimental investigation of the tongue and groove effect for the Philips multileaf collimator. 1998, 43 (10):3157-65 Phys Med Biol
    Journal
    Physics in Medicine and Biology
    URI
    http://hdl.handle.net/10541/91667
    DOI
    10.1088/0031-9155/43/10/034
    PubMed ID
    9814543
    Type
    Article
    Language
    en
    ISSN
    0031-9155
    ae974a485f413a2113503eed53cd6c53
    10.1088/0031-9155/43/10/034
    Scopus Count
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