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    Monitor chamber backscatter for intensity modulated radiation therapy using multileaf collimators.

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    Authors
    Hounsell, Alan R
    Affiliation
    North Western Medical Physics, Christie Hospital NHS Trust, Manchester, UK. prsarh@dalpha2.cr.man.ac.uk
    Issue Date
    1998-02
    
    Metadata
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    Abstract
    Backscattered radiation into the machine monitor chamber can affect the machine output variation, with changes in field size and shape. For intensity modulated radiation therapy (IMRT) where many field, which may have small dimensions, are summed to give an intensity modulated field, the magnitude of backscatter will be different due to both the backscattering surface area changing, and the delivered monitor units being larger than for the equivalent static field. The effect of backscatter variation with field size for a Philips SL15 accelerator has been investigated at 8 MV for static and IMRT fields both in the standard clinical operating condition where an anti-backscatter plate is fitted, and also for a case where the anti-backscatter plate has been removed. The results show that in the absence of the anti-backscatter plate the variation in output between a 4 cm by 4 cm field and a 40 cm by 40 cm field size due to backscattered radiation was 5% for static fields. The anti-backscatter plate reduced this variation to less than 1%. When the accelerator operated in IMRT mode, with the backscatter plate in place, changes in the output due to additional backscattered radiation were less than 0.3%. With the backscatter plate removed, the outputs were lower, indicating the presence of additional backscattered radiation. It can be concluded that for the Philips MLC and SL accelerator with its anti-backscatter plate, the effects of backscattered radiation can be ignored for both static and IMRT fields.
    Citation
    Monitor chamber backscatter for intensity modulated radiation therapy using multileaf collimators. 1998, 43 (2):445-54 Phys Med Biol
    Journal
    Physics in Medicine and Biology
    URI
    http://hdl.handle.net/10541/92015
    DOI
    10.1088/0031-9155/43/2/017
    PubMed ID
    9547177
    Type
    Article
    Language
    en
    ISSN
    0031-9155
    ae974a485f413a2113503eed53cd6c53
    10.1088/0031-9155/43/2/017
    Scopus Count
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