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    Clinical applications of composite and realtime megavoltage imaging.

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    Authors
    Kirby, Mike C
    Kane, B
    Williams, Peter C
    Affiliation
    North Western Medical Physics Department, Christie Hospital, Manchester, UK.
    Issue Date
    1995
    
    Metadata
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    Abstract
    The versatility of electronic portal imaging devices (EPIDs) is best demonstrated by their ability to perform novel megavoltage imaging protocols, which are still pertinent to good radiotherapy practice. This paper examines two such techniques: composite and realtime imaging. Our EPID can be programmed to acquire and manipulate images very easily, allowing images from segmented treatment protocols to be mixed and displayed, giving a composite image of the effective treatment result. Its use for verifying the efficacy of spinal shielding using a segmented, offset collimator technique is described. By acquiring images very quickly, realtime imaging sequences can be obtained and used to analyse anatomical movement within a single treatment field. The technique is employed here to investigate movement in radical lung, breast, abdomen, pelvis and thyroid treatments. Our results show that the protocol is vital for treatment sites involving the lungs; changes up to 5 mm have been observed in the maximum lung depth for breast treatments, and displacements up to 16 mm for radical lung treatments. It is also useful in other anatomical sites for ensuring that no movement occurs.
    Citation
    Clinical applications of composite and realtime megavoltage imaging. 1995, 7 (5):308-16 Clin Oncol
    Journal
    Clinical Oncology
    URI
    http://hdl.handle.net/10541/98836
    DOI
    10.1016/S0936-6555(05)80539-4
    PubMed ID
    8580057
    Type
    Article
    Language
    en
    ISSN
    0936-6555
    ae974a485f413a2113503eed53cd6c53
    10.1016/S0936-6555(05)80539-4
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