Dose distribution of secondary radiation in a water phantom for a spatially fractionated proton beam
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F25%3A00642073" target="_blank" >RIV/61389005:_____/25:00642073 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S112017972500314X" target="_blank" >https://www.sciencedirect.com/science/article/pii/S112017972500314X</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.ejmp.2025.105204" target="_blank" >10.1016/j.ejmp.2025.105204</a>
Alternative languages
Result language
angličtina
Original language name
Dose distribution of secondary radiation in a water phantom for a spatially fractionated proton beam
Original language description
Objective: 3D mapping of scattered radiation doses in water after grid proton irradiation using a dedicated brass collimator was performed within the EURADOS experiment at the scanning gantry of the Cyclotron Centre Bronowice at IFJ PAN. The goal of this paper was to determine to what extent the dedicated grid collimators would increase secondary doses administered to patients compared to Pencil Beam Scanning (PBS) techniques. Methods: A broad set of passive point-like detectors including thermoluminescence (TLD), radiophotoluminescence (RPL) and track detectors (PADC) positioned in a dedicated water phantom was applied to determine gamma and neutron doses. The dose assessment was supported by Monte Carlo (MC) radiation transport calculations. Results: The results show that the highest absorbed dose values were measured in the proximal area of the proton beam field and in the Spread out Bragg Peak (SOBP). Applying the same treatment plan the beam formation with PBS + grid collimator caused a 5-fold increase in the absorbed out-of-field dose compared to irradiation with the PBS and in the case of fast neutrons, the increase was around a factor of 10. These doses are comparable to unwanted exposure to scattered radiation arising from conventional photon radiotherapy. Conclusions: The spatial distribution of the measured dosimetric quantities supports the thesis that in spatially fractionated proton radiotherapy, in which the beam is formed using a grid collimator, the main source of gamma radiation and neutrons is the collimator. Despite this, grid collimators remain a viable option due to their adaptability to various proton systems.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
30224 - Radiology, nuclear medicine and medical imaging
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physica Medica
ISSN
1120-1797
e-ISSN
1724-191X
Volume of the periodical
139
Issue of the periodical within the volume
November
Country of publishing house
GB - UNITED KINGDOM
Number of pages
11
Pages from-to
105204
UT code for WoS article
001610398800001
EID of the result in the Scopus database
2-s2.0-105020967831