Dose distribution of secondary radiation in a water phantom for a spatially fractionated proton beam

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Dose distribution of secondary radiation in a water phantom for a spatially fractionated proton beam

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Dose distribution of secondary radiation in a water phantom for a spatially fractionated proton beam

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

30224 - Radiology, nuclear medicine and medical imaging

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physica Medica

ISSN

1120-1797

e-ISSN

1724-191X

Svazek periodika

139

Číslo periodika v rámci svazku

November

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

105204

Kód UT WoS článku

001610398800001

EID výsledku v databázi Scopus

2-s2.0-105020967831