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    A comparison of two pencil beam scanning treatment planning systems for proton therapy

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    Author
    Langner, U.W.
    Mundis, M.
    Strauss, D.
    Date
    2018
    Journal
    Journal of Applied Clinical Medical Physics
    Publisher
    John Wiley and Sons Ltd
    Type
    Article
    
    Metadata
    Show full item record
    See at
    https://dx.doi.org/10.1002/acm2.12235
    Abstract
    Objective: Analytical dose calculation algorithms for Eclipse and Raystation treatment planning systems (TPS), as well as a Raystation Monte Carlo model are compared to corresponding measured point doses. Method: The TPS were modeled with the same beam data acquired during commissioning. Thirty‐five typical plans were made with each planning system, 31 without range shifter and four with a 5 cm range shifter. Point doses in these planes were compared to measured doses. Results: The mean percentage difference for all plans between Raystation and Eclipse were 1.51 ± 1.99%. The mean percentage difference for all plans between TPS models and measured values are −2.06 ± 1.48% for Raystation pencil beam (PB), −0.59 ± 1.71% for Eclipse and −1.69 ± 1.11% for Raystation monte carlo (MC). The distribution for the patient plans were similar for Eclipse and Raystation MC with a P‐value of 0.59 for a two tailed unpaired t‐test and significantly different from the Raystation PB model with P = 0.0013 between Raystation MC and PB. All three models faired markedly better if plans with a 5 cm range shifter were ignored. Plan comparisons with a 5 cm range shifter give differences between Raystation and Eclipse of 3.77 ± 1.82%. The mean percentage difference for 5 cm range shifter plans between TPS models and measured values are −3.89 ± 2.79% for Raystation PB, −0.25 ± 3.85% for Eclipse and 1.55 ± 1.95% for Raystation MC. Conclusion: Both Eclipse and Raystation PB TPS are not always accurate within ±3% for a 5 cm range shifters or for small targets. This was improved with the Raystation MC model. The point dose calculations of Eclipse, Raystation PB, and Raystation MC compare within ±3% to measured doses for the other scenarios tested. Copyright 2018 American Association of Physicists in Medicine.
    Keyword
    Monte Carlo methods
    Treatment planning
    Identifier to cite or link to this item
    https://www.scopus.com/inward/record.uri?eid=2-s2.0-85037652699&doi=10.1002%2facm2.12235&partnerID=40&md5=ed915c86c2bf507658fd8e8a15dc9f75; http://hdl.handle.net/10713/9105
    ae974a485f413a2113503eed53cd6c53
    10.1002/acm2.12235
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