{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,8]],"date-time":"2026-06-08T01:41:21Z","timestamp":1780882881752,"version":"3.54.1"},"reference-count":31,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2024,10,7]],"date-time":"2024-10-07T00:00:00Z","timestamp":1728259200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["aapm.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J Applied Clin Med Phys"],"published-print":{"date-parts":[[2025,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Purpose<\/jats:title><jats:p>Recently, 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\u2010Si 1200 EPID and assess the long\u2010term stability of its response.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Weekly measurements were performed on two clinically used TrueBeam linear accelerators (linacs) equipped with a\u2010Si 1200 EPID detectors over a 2\u2010year period. They included dark and flood calibration fields, and EPID response to an open field corrected for the long\u2010term 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\u2010term trends. Comparisons were made between the two linacs for each beam energy. Pixel sensitivity matrices (PSM) were determined semi\u2010annually and analyzed for long\u2010term constancy for both treatment machines.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The long\u2010term 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\u2010corrected EPID response showed long\u2010term variation from 0.28% to 0.36%, depending on beam energy, while the short\u2010term variation was 0.04%\u20130.07% for EPID and 0.02%\u20130.06% for secondary dosimeters. The long\u2010term variation of secondary dosimeters was 0.2%\u20130.3%. PSMs were found to be stable to within 1% for 97.8% of pixels and 2% for 100% of pixels.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Techniques to monitor and assess the long\u2010term performance of the a\u2010Si 1200 EPID as a dosimeter were developed and implemented using two TrueBeam linacs. The long\u2010term variation of the EPID response was within clinical tolerance indicated in AAPM TG\u2010142 report, and the detector was shown to be stable and reproducible for routine clinical dosimetry.<\/jats:p><\/jats:sec>","DOI":"10.1002\/acm2.14551","type":"journal-article","created":{"date-parts":[[2024,10,7]],"date-time":"2024-10-07T17:28:33Z","timestamp":1728322113000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Long\u2010term performance monitoring of a\u2010Si 1200 electronic portal imaging device for dosimetric applications"],"prefix":"10.1002","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-2539-1251","authenticated-orcid":false,"given":"Ivan","family":"Kutuzov","sequence":"first","affiliation":[{"name":"Department of Physics and Astronomy University of Manitoba  Winnipeg Manitoba Canada"},{"name":"Medical Physics Department CancerCare Manitoba  Winnipeg Manitoba 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