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Adaptive proton radiation therapy via fast Monte Carlo dose calculation to correct for inter- and intra-fraction motion and geometry changes

Botas Sanmartin, Pablo

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Abstract

Intensity modulated proton therapy (IMPT) plans precisely balance thousands of proton beamlets, giving high dose to the tumor while trying to spare healthy tissues. However, plan quality is affected by factors including: 1) dose calculation inaccuracies, 2) underestimation of the biological effect of the dose in sensitive areas and geometrical changes like 3) patient movement or 4) changes in posture and anatomy. All these factors are addressed in the projects here presented.

Project 1, in collaboration, introduces an upgraded version of a Monte Carlo package for graphics processing units (GPU-MC) to provide fast and accurate dose calculations. This package is extended to serve as the unique dose calculation engine in the following projects. Project 2, in collaboration, presents a prioritized optimization method to reduce the potential biological effect of the radiation in organs at risk near the tumor.

Project 3 compares computationally efficient strategies to take into account the patient respiratory motion by defining planning target volumes based on a 4DCT of the patient. Density overwrites considering water-equivalent-path-length to voxels across the 4DCT targets works best.

Project 4 demonstrates an online algorithm that maintains IMPT plan quality through treatment, adapting it to the daily patient posture and anatomy using GPU-MC calculations.

Item Type: Dissertation
Supervisor: Seco, Prof. Dr. Joao
Place of Publication: Heidelberg
Date of thesis defense: 9 January 2019
Date Deposited: 28 Feb 2019 13:48
Date: 2019
Faculties / Institutes: The Faculty of Physics and Astronomy > Institute of Physics
Subjects: 530 Physics
610 Medical sciences Medicine
Controlled Keywords: Monte Carlo
Uncontrolled Keywords: proton therapy, GPU, IMPT, head and neck, LET, ITV, Lung, CBCT, Deformable image registration

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  • Adaptive proton radiation therapy via fast Monte Carlo dose calculation to correct for inter- and intra-fraction motion and geometry changes. (deposited 28 Feb 2019 13:48) [Currently Displayed]
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