An assessment of a 3D EPID-based dosimetry system using conventional two- and three-dimensional detectors for VMAT

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00064173%3A_____%2F18%3AN0000070" target="_blank" >RIV/00064173:_____/18:N0000070 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21340/18:00328520

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.ejmp.2017.11.014" target="_blank" >http://dx.doi.org/10.1016/j.ejmp.2017.11.014</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ejmp.2017.11.014" target="_blank" >10.1016/j.ejmp.2017.11.014</a>

Jazyk výsledku

angličtina

Název v původním jazyce

An assessment of a 3D EPID-based dosimetry system using conventional two- and three-dimensional detectors for VMAT

Popis výsledku v původním jazyce

Purpose: To provide a 3D dosimetric evaluation of a commercial portal dosimetry system using 2D/3D detectors under ideal conditions using VMAT.& para;& para;Methods: A 2D ion chamber array, radiochromic film and gel dosimeter were utilised to provide a dosimetric evaluation of transit phantom and pre-treatment 'fluence' EPID back-projected dose distributions for a standard VMAT plan. In-house 2D and 3D gamma methods compared pass statistics relative to each dosimeter and TPS dose distributions.& para;& para;Results: Fluence mode and transit EPID dose distributions back-projected onto phantom geometry produced 2D gamma pass rates in excess of 97% relative to other tested detectors and exported TPS dose planes when a 3%, 3 mm global gamma criterion was applied. Use of a gel dosimeter within a glass vial allowed comparison of measured 3D dose distributions versus EPID 3D dose and TPS calculated distributions. 3D gamma comparisons between modalities at 3%, 3 mm gave pass rates in excess of 92%. Use of fluence mode was indicative of transit results under ideal conditions with slightly reduced dose definition.& para;& para;Conclusions: 3D EPID back projected dose distributions were validated against detectors in both 2D and 3D. Cross validation of transit dose delivered to a patient is limited due to reasons of practicality and the tests presented are recommended as a guideline for 3D EPID dosimetry commissioning; allowing direct comparison between detector, TPS, fluence and transit modes. The results indicate achievable gamma scores for a complex VMAT plan in a homogenous phantom geometry and contributes to growing experience of 3D EPID dosimetry.

Název v anglickém jazyce

An assessment of a 3D EPID-based dosimetry system using conventional two- and three-dimensional detectors for VMAT

Popis výsledku anglicky

Purpose: To provide a 3D dosimetric evaluation of a commercial portal dosimetry system using 2D/3D detectors under ideal conditions using VMAT.& para;& para;Methods: A 2D ion chamber array, radiochromic film and gel dosimeter were utilised to provide a dosimetric evaluation of transit phantom and pre-treatment 'fluence' EPID back-projected dose distributions for a standard VMAT plan. In-house 2D and 3D gamma methods compared pass statistics relative to each dosimeter and TPS dose distributions.& para;& para;Results: Fluence mode and transit EPID dose distributions back-projected onto phantom geometry produced 2D gamma pass rates in excess of 97% relative to other tested detectors and exported TPS dose planes when a 3%, 3 mm global gamma criterion was applied. Use of a gel dosimeter within a glass vial allowed comparison of measured 3D dose distributions versus EPID 3D dose and TPS calculated distributions. 3D gamma comparisons between modalities at 3%, 3 mm gave pass rates in excess of 92%. Use of fluence mode was indicative of transit results under ideal conditions with slightly reduced dose definition.& para;& para;Conclusions: 3D EPID back projected dose distributions were validated against detectors in both 2D and 3D. Cross validation of transit dose delivered to a patient is limited due to reasons of practicality and the tests presented are recommended as a guideline for 3D EPID dosimetry commissioning; allowing direct comparison between detector, TPS, fluence and transit modes. The results indicate achievable gamma scores for a complex VMAT plan in a homogenous phantom geometry and contributes to growing experience of 3D EPID dosimetry.

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

2018

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

45

Číslo periodika v rámci svazku

January

Stát vydavatele periodika

IT - Italská republika

Počet stran výsledku

10

Strana od-do

25-34

Kód UT WoS článku

000426007200005

EID výsledku v databázi Scopus

2-s2.0-85042131568