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    Comparison of multi-institutional Varian ProBeam pencil beam scanning proton beam commissioning data

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    Author
    Langner, U.W.
    Eley, J.G.
    Dong, L.
    Date
    2017
    Journal
    Journal of Applied Clinical Medical Physics
    Publisher
    AAPM - American Association of Physicists in Medicine
    Type
    Article
    
    Metadata
    Show full item record
    See at
    https://doi.org/10.1002/acm2.12078
    Abstract
    Purpose: Commissioning beam data for proton spot scanning beams are compared for the first two Varian ProBeam sites in the United States, at the Maryland Proton Treatment Center (MPTC) and Scripps Proton Therapy Center (SPTC). In addition, the extent to which beams can be matched between gantry rooms at MPTC is investigated. Method: Beam data for the two sites were acquired with independent dosimetry systems and compared. Integrated depth dose curves (IDDs) were acquired with Bragg peak ion chambers in a 3D water tank for pencil beams at both sites. Spot profiles were acquired at different distances from the isocenter at a gantry angle of 0° as well as a function of gantry angles. Absolute dose calibration was compared between SPTC and the gantries at MPTC. Dosimetric verification of test plans, output as a function of gantry angle, monitor unit (MU) linearity, end effects, dose rate dependence, and plan reproducibility were compared for different gantries at MPTC. Results: The IDDs for the two sites were similar, except in the plateau region, where the SPTC data were on average 4.5% higher for lower energies. This increase in the plateau region decreased as energy increased, with no marked difference for energies higher than 180 MeV. Range in water coincided for all energies within 0.5 mm. The sigmas of the spot profiles in air were within 10% agreement at isocenter. This difference increased as detector distance from the isocenter increased. Absolute doses for the gantries measured at both sites were within 1% agreement. Test plans, output as function of gantry angle, MU linearity, end effects, dose rate dependence, and plan reproducibility were all within tolerances given by TG142. Conclusion: Beam data for the two sites and between different gantry rooms were well matched.
    Keyword
    Probeam
    Proton
    Spot scanning
    Identifier to cite or link to this item
    https://www.scopus.com/inward/record.uri?eid=2-s2.0-85018886701&doi=10.1002%2facm2.12078&partnerID=40&md5=d44055c60e6d186a656e7d3ea70e3dad; http://hdl.handle.net/10713/11135
    ae974a485f413a2113503eed53cd6c53
    10.1002/acm2.12078
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    UMB Open Access Articles 2017

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