An assessment of a 3D EPID-based dosimetry system using conventional two- and three-dimensional detectors for VMAT
The result's identifiers
Result code in 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>
Alternative codes found
RIV/68407700:21340/18:00328520
Result on the web
<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>
Alternative languages
Result language
angličtina
Original language name
An assessment of a 3D EPID-based dosimetry system using conventional two- and three-dimensional detectors for VMAT
Original language description
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.
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
2018
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
45
Issue of the periodical within the volume
January
Country of publishing house
IT - ITALY
Number of pages
10
Pages from-to
25-34
UT code for WoS article
000426007200005
EID of the result in the Scopus database
2-s2.0-85042131568