eprintid: 25875
rev_number: 12
eprint_status: archive
userid: 4061
dir: disk0/00/02/58/75
datestamp: 2019-02-28 13:48:26
lastmod: 2019-03-06 12:02:30
status_changed: 2019-02-28 13:48:26
type: doctoralThesis
succeeds: 25526
metadata_visibility: show
creators_name: Botas Sanmartin, Pablo
title: Adaptive proton radiation therapy via fast Monte Carlo dose calculation to correct for inter- and intra-fraction motion and geometry changes
subjects: ddc-530
subjects: ddc-610
divisions: i-130200
adv_faculty: af-13
keywords: proton therapy, GPU, IMPT, head and neck, LET, ITV, Lung, CBCT, Deformable image registration
cterms_swd: Monte Carlo
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.
date: 2019
id_scheme: DOI
id_number: 10.11588/heidok.00025875
ppn_swb: 1655778773
own_urn: urn:nbn:de:bsz:16-heidok-258752
date_accepted: 2019-01-09
advisor: HASH(0x55e0f7ef9658)
language: eng
bibsort: BOTASSANMAADAPTIVEPR2019
full_text_status: public
place_of_pub: Heidelberg
citation:   Botas Sanmartin, Pablo  (2019) Adaptive proton radiation therapy via fast Monte Carlo dose calculation to correct for inter- and intra-fraction motion and geometry changes.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/25875/3/thesis_Botas_color.pdf