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An assessment of a 3D EPID-based dosimetry system using conventional two- and three-dimensional detectors for VMAT
S. Stevens, P. Dvorak, V. Spevacek, K. Pilarova, M. Bray-Parry, J. Gesner, A. Richmond,
Language English Country Italy
Document type Journal Article, Validation Study
- MeSH
- Lumbar Vertebrae radiation effects MeSH
- Radiotherapy Dosage MeSH
- Phantoms, Imaging MeSH
- Humans MeSH
- Radiometry instrumentation methods MeSH
- Radiotherapy, Intensity-Modulated * methods MeSH
- Check Tag
- Humans MeSH
- Publication type
- Journal Article MeSH
- Validation Study MeSH
PURPOSE: To provide a 3D dosimetric evaluation of a commercial portal dosimetry system using 2D/3D detectors under ideal conditions using VMAT. 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. 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. 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.
References provided by Crossref.org
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