Dose distributions of the INTRABEAM electronic brachytherapy system measured with traceable detectors

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00177016%3A_____%2F23%3AN0000076" target="_blank" >RIV/00177016:_____/23:N0000076 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1088/1748-0221/18/07/P07049" target="_blank" >https://doi.org/10.1088/1748-0221/18/07/P07049</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1748-0221/18/07/P07049" target="_blank" >10.1088/1748-0221/18/07/P07049</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Dose distributions of the INTRABEAM electronic brachytherapy system measured with traceable detectors

Popis výsledku v původním jazyce

Příspěvek ČMI: Monte Carlo simulace, příprava podstatné části textu článku In this work, a methodology to determine the absorbed dose rate to water distribution from electronic brachytherapy (eBT) units is suggested. It involves measuring directly in a full scatter water tank with small active detectors whose energy response at low X-ray photon energies have been previously characterized. Dose distributions of an INTRABEAM PRS 500 system in two configurations — bare needle and with the spherical applicator of 40 mm diameter — were measured in water using the Exradin A26 ionization chamber and the PTW 60019 microDiamond detector. The continuous energy response of these two detectors in terms of air kerma from 5 keV to 70 keV (eBT energy range) was available from a previous calibration at several X-ray radiation qualities. Here, it is converted to the response in absorbed dose to water using correction factors obtained with Monte Carlo (MC) particle transport simulations. The detectors were modelled using the MCNP code. The air kerma calibration factors were simulated and compared with measurements to refine and validate the models. A series of simulations of the experimental arrangement of the INTRABEAM and the detector were carried out for determining the system specific detector correction factors. These values are distance-dependent due to the steep dose gradient and the remarkable spectral changes around the eBT source in water. The dose rate with distance from the source, the radial and the polar distributions of the INTRABEAM are reported and compared with the manufacturers supplied data. This work is an effort to provide traceability for detectors and measurement procedures for the determination of 3D dose distributions as part of the European joint research project "Primary standards and traceable measurement methods for X-ray emitting electronic brachytherapy devices" (18NRM02 PRISM-eBT).

Název v anglickém jazyce

Dose distributions of the INTRABEAM electronic brachytherapy system measured with traceable detectors

Popis výsledku anglicky

Příspěvek ČMI: Monte Carlo simulace, příprava podstatné části textu článku In this work, a methodology to determine the absorbed dose rate to water distribution from electronic brachytherapy (eBT) units is suggested. It involves measuring directly in a full scatter water tank with small active detectors whose energy response at low X-ray photon energies have been previously characterized. Dose distributions of an INTRABEAM PRS 500 system in two configurations — bare needle and with the spherical applicator of 40 mm diameter — were measured in water using the Exradin A26 ionization chamber and the PTW 60019 microDiamond detector. The continuous energy response of these two detectors in terms of air kerma from 5 keV to 70 keV (eBT energy range) was available from a previous calibration at several X-ray radiation qualities. Here, it is converted to the response in absorbed dose to water using correction factors obtained with Monte Carlo (MC) particle transport simulations. The detectors were modelled using the MCNP code. The air kerma calibration factors were simulated and compared with measurements to refine and validate the models. A series of simulations of the experimental arrangement of the INTRABEAM and the detector were carried out for determining the system specific detector correction factors. These values are distance-dependent due to the steep dose gradient and the remarkable spectral changes around the eBT source in water. The dose rate with distance from the source, the radial and the polar distributions of the INTRABEAM are reported and compared with the manufacturers supplied data. This work is an effort to provide traceability for detectors and measurement procedures for the determination of 3D dose distributions as part of the European joint research project "Primary standards and traceable measurement methods for X-ray emitting electronic brachytherapy devices" (18NRM02 PRISM-eBT).

Druh

J_ost - Ostatní články v recenzovaných periodicích

CEP obor

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OECD FORD obor

10304 - Nuclear physics

Projekt

<a href="/cs/project/8B19003" target="_blank" >8B19003: Primary standards and traceable measurement methods for X-ray emitting electronic brachytherapy devices</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Journal of Instrumentation

ISSN

1748-0221

e-ISSN

—

Svazek periodika

18

Číslo periodika v rámci svazku

P07049

Stát vydavatele periodika

IT - Italská republika

Počet stran výsledku

27

Strana od-do

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Kód UT WoS článku

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EID výsledku v databázi Scopus

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