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    Leaf position verification during dynamic beam delivery: a comparison of three applications using electronic portal imaging.

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    Authors
    Partridge, M
    Evans, P M
    Van Herk, M
    Ploeger, L S
    Budgell, Geoff J
    James, H V
    Affiliation
    Joint Department of Physics, Institute of Cancer Research and Royal Marsden NHS Trust, Sutton, United Kingdom.
    Issue Date
    2000-07
    
    Metadata
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    Abstract
    The use of a dynamic multileaf collimator (MLC) to deliver intensity-modulated beams presents a problem for conventional verification techniques. The use of electronic portal imaging to track MLC leaves during beam delivery has been shown to provide a solution to this problem. An experimental comparison of three different verification systems, each using a different electronic portal imaging technology, is presented. Two of the systems presented are commercially available imagers with in-house modifications, with the third system being an in-house built experimental system. The random and systematic errors present in each of the verifications systems are measured and presented, together with the study of the effects of varying dose rate and leaf speed on verification system performance. The performance of the three systems is demonstrated to be very similar, with an overall accuracy in comparing measured and prescribed collimator trajectories of approximately +/-1.0 mm. Systematic errors in the percentage delivered dose signal provided by the accelerator are significant and must be corrected for good performance of the current systems. It is demonstrated that, with suitable modifications, commercially available portal imaging systems can be used to verify dynamic MLC beam delivery.
    Citation
    Leaf position verification during dynamic beam delivery: a comparison of three applications using electronic portal imaging. 2000, 27 (7):1601-9 Med Phys
    Journal
    Medical Physics
    URI
    http://hdl.handle.net/10541/86657
    PubMed ID
    10947263
    Type
    Article
    Language
    en
    ISSN
    0094-2405
    Collections
    All Christie Publications

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