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    An adaptive spot placement method on Cartesian grid for pencil beam scanning proton therapy

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    Available after: 12/02/2022 (1.433Mb)
    Issue Date
    2021-12-02
    Author
    Lin, Bowen
    Fu, Shujun
    Lin, Yuting
    Rotondo, Ronny L.
    Huang, Weizhang
    Li, Harold H.
    Chen, Ronald C.
    Gao, Hao
    Publisher
    IOP Publishing
    Type
    Article
    Article Version
    Scholarly/refereed, author accepted manuscript
    Rights
    © 2021 Institute of Physics and Engineering in Medicine.
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    Abstract
    Pencil beam scanning proton radiotherapy (RT) offers flexible proton spot placement near treatment targets for delivering tumoricidal radiation dose to tumor targets while sparing organs-at-risk. Currently the spot placement is mostly based on a non-adaptive sampling (NS) strategy on a Cartesian grid. However, the spot density or spacing during NS is a constant for the Cartesian grid that is independent of the geometry of tumor targets, and thus can be suboptimal in terms of plan quality (e.g. target dose conformality) and delivery efficiency (e.g. number of spots). This work develops an adaptive sampling (AS) spot placement method on the Cartesian grid that fully accounts for the geometry of tumor targets. Compared with NS, AS places (1) a relatively fine grid of spots at the boundary of tumor targets to account for the geometry of tumor targets and treatment uncertainties (setup and range uncertainty) for improving dose conformality, and (2) a relatively coarse grid of spots in the interior of tumor targets to reduce the number of spots for improving delivery efficiency and robustness to the minimum-minitor-unit (MMU) constraint. The results demonstrate that (1) AS achieved comparable plan quality with NS for regular MMU and substantially improved plan quality from NS for large MMU, using merely about 10% of spots from NS, where AS was derived from the same Cartesian grid as NS; (2) on the other hand, with similar number of spots, AS had better plan quality than NS consistently for regular and large MMU.
    URI
    http://hdl.handle.net/1808/33181
    DOI
    https://doi.org/10.1088/1361-6560/ac3b65
    Collections
    • Mathematics Scholarly Works [282]
    Citation
    Lin, B., Fu, S., Lin, Y., Rotondo, R. L., Huang, W., Li, H. H., Chen, R. C., & Gao, H. (2021). An adaptive spot placement method on Cartesian grid for pencil beam scanning proton therapy. Physics in medicine and biology, 66(23), 10.1088/1361-6560/ac3b65. https://doi.org/10.1088/1361-6560/ac3b65

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    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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