A method to select aperture margin in collimated spot scanning proton therapy.

Physics in Medicine and Biology
Dongxu WangDaniel E Hyer

Abstract

The use of collimator or aperture may sharpen the lateral dose gradient for spot scanning proton therapy. However, to date, there has not been a standard method to determine the aperture margin for a single field in collimated spot scanning proton therapy. This study describes a theoretical framework to select the optimal aperture margin for a single field, and also presents the spot spacing limit required such that the optimal aperture margin exists. Since, for a proton pencil beam partially intercepted by collimator, the maximum point dose (spot center) shifts away from the original pencil beam central axis, we propose that the optimal margin should be equal to the maximum pencil beam center shift under the condition that spot spacing is small with respect to the maximum pencil beam center shift, which can be numerically determined based on beam modeling data. A test case is presented which demonstrates agreement with the prediction made based on the proposed methods. When apertures are applied in a commercial treatment planning system this method may be implemented.

References

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Citations

Nov 29, 2015·International Journal of Radiation Oncology, Biology, Physics·Alexandra MoignierDaniel Hyer
May 28, 2019·Medical Physics·Bijan ArjomandyYuki Kase
Mar 1, 2016·International Journal of Particle Therapy·Alexandra MoignierDaniel Hyer
Dec 20, 2017·Physics in Medicine and Biology·Carla WinterhalterSairos Safai
Dec 14, 2018·Physics in Medicine and Biology·Carla WinterhalterSairos Safai
Jan 13, 2018·Physics in Medicine and Biology·C WinterhalterS Safai
Nov 29, 2020·Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists·Suresh RanaJohn Chang
Jul 22, 2021·International Journal of Particle Therapy·Daniel E HyerBlake R Smith

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