ArticleJournal of applied clinical medical physics2025
Long-term performance monitoring of a-Si 1200 electronic portal imaging device for dosimetric applications.
Article in Journal of applied clinical medical physics, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed.
- A component-wise commissioning and validation framework for non-transit electronic portal imaging device patient-specific quality assurance.Physics and imaging in radiation oncology · 2026Article
- Sensitivity and concordance study of an open source EPID-based linear accelerator test suite.Journal of applied clinical medical physics · 2026Article
- Effectiveness of EPID-based in-vivo dosimetry with EPIgraySaudi medical journal · 2025Article
- Application of a model-based water-equivalent EPID image conversion algorithm for linac beam QA.Journal of applied clinical medical physics · 2025Article
- Long-term performance monitoring of a-Si 1200 electronic portal imaging device for dosimetric applications.Journal of applied clinical medical physics · 2025Article
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4 authors.
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Abstract
purposeRecently, dosimetri applications of the electronic portal imaging device (EPID) in radiotherapy have gained popularity. Confidence in the robust and reliable dosimetric performance of EPID detectors is essential for their clinical use. This study aimed to evaluate the dosimetric performance of the a-Si 1200 EPID and assess the long-term stability of its response.
methodsWeekly measurements were performed on two clinically used TrueBeam linear accelerators (linacs) equipped with a-Si 1200 EPID detectors over a 2-year period. They included dark and flood calibration fields, and EPID response to an open field corrected for the long-term machine output drift measured with the secondary absolute dosimeters: an ion chamber and an ion chamber array. All measurements were performed using five photon beam energies and two imaging modes: continuous and dosimetry. The measurements were analyzed for constancy and the presence of long-term trends. Comparisons were made between the two linacs for each beam energy. Pixel sensitivity matrices (PSM) were determined semi-annually and analyzed for long-term constancy for both treatment machines.
resultsThe long-term variation of the dark and flood field signals, integrated across the EPID plane, over the entire observation period did not exceed 0.17% and 0.79%, respectively. The output-corrected EPID response showed long-term variation from 0.28% to 0.36%, depending on beam energy, while the short-term variation was 0.04%-0.07% for EPID and 0.02%-0.06% for secondary dosimeters. The long-term variation of secondary dosimeters was 0.2%-0.3%. PSMs were found to be stable to within 1% for 97.8% of pixels and 2% for 100% of pixels.
conclusionTechniques to monitor and assess the long-term performance of the a-Si 1200 EPID as a dosimeter were developed and implemented using two TrueBeam linacs. The long-term variation of the EPID response was within clinical tolerance indicated in AAPM TG-142 report, and the detector was shown to be stable and reproducible for routine clinical dosimetry.
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