{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,9]],"date-time":"2026-10-09T18:29:58Z","timestamp":1791570598525,"version":"4.3.4"},"reference-count":53,"publisher":"Wiley","issue":"12","license":[{"start":{"date-parts":[[2025,11,25]],"date-time":"2025-11-25T00:00:00Z","timestamp":1764028800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2025,11,25]],"date-time":"2025-11-25T00:00:00Z","timestamp":1764028800000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["aapm.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Medical Physics"],"published-print":{"date-parts":[[2025,12]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>In radiation therapy, Patient\u2010Specific Quality Assurance (PSQA) is used to ensure safety and accuracy of treatment deliveries, which is paramount to control the disease while safeguarding healthy tissues. In common clinical practice, this involves comparing the planned dose to a dose measured in a phantom prior to the treatment. However, the emergence of Adaptive Radiation Therapy (ART) modalities challenges the PSQA workflow. This is especially the case in online ART workflow, where the patient is maintained immobilized on the treatment couch during treatment adaptation and delivery. Furthermore, for treatment plans using motion management, the plan is adapted in real time to encounter target motion. In these cases, the traditional phantom\u2010based pre\u2010treatment PSQA is impractical, and the development of substitute strategies is needed.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Purpose<\/jats:title>\n                    <jats:p>To validate a PSQA tool for the Radixact\u00ae units, which allows phantomless post\u2010delivery verifications.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>In tomotherapy, the dose is optimized by modulating the Leaf Open Times (LOTs) of the Multileaf Collimator (MLC). A metric based on the actual LOTs was developed to verify the accuracy of the dose delivered to the target and to the Organs At Risk (OARs). To validate the metric, treatment plans of prostate and Head and Neck (H&amp;N) patients were modified by introducing errors in the LOT sinogram and subsequently delivered to a phantom. Based on these deliveries, LOT\u2010based metric indices were calculated and their sensitivity to clinically relevant errors were analyzed and compared to the standard benchmark gamma index metric. The clinically relevant errors included category 1 errors, when measured outputs don't remain within 3% of the established baseline, and category 2 errors, when the clinical goals are not fulfilled.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>The LOT\u2010based metric outperforms the gamma index metric in predicting dose deviations and clinical goal deviations. It also demonstrates superior performance in classifying acceptable and unacceptable plans in terms of category 1 error detection for H&amp;N patients, while its performance in category 1 error detection for prostate cases and category 2 error detection for both groups is comparable. The LOT\u2010based metric, with optimal cutoffs, outperforms the gamma index metric in terms of both sensitivity and specificity for category 1 and 2 error detection in prostate cases, while the gamma index metric outperforms the LOT\u2010based metric in term of sensitivity for category 2 error detection in H&amp;N cases.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>This study establishes the LOT\u2010based metric as a reliable tool for pretreatment PSQA, serving as a substitute for the conventional gamma index metric, while additionally offering the advantage of fraction\u2010by\u2010fraction monitoring of treatment delivery quality.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/mp.70161","type":"journal-article","created":{"date-parts":[[2025,11,26]],"date-time":"2025-11-26T02:42:31Z","timestamp":1764124951000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Validation of a patient\u2010specific quality assurance tool for offline analysis of treatment deliveries"],"prefix":"10.1002","volume":"52","author":[{"given":"Marie","family":"Nasrallah","sequence":"first","affiliation":[{"name":"Institute of Radiation Physics Lausanne University Hospital Lausanne Vaud Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9941-8252","authenticated-orcid":false,"given":"Michele","family":"Zeverino","sequence":"additional","affiliation":[{"name":"Institute of Radiation Physics Lausanne University Hospital Lausanne Vaud Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Edward","family":"Chao","sequence":"additional","affiliation":[{"name":"Accuray Incorporated  Madison Wisconsin USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dylan","family":"Casey","sequence":"additional","affiliation":[{"name":"Accuray Incorporated  Madison Wisconsin USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fernanda","family":"Herrera","sequence":"additional","affiliation":[{"name":"Radiation Oncology Department Lausanne University Hospital Lausanne Lausanne Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2076-0296","authenticated-orcid":false,"given":"Fran\u00e7ois","family":"Bochud","sequence":"additional","affiliation":[{"name":"Institute of Radiation Physics Lausanne University Hospital Lausanne Vaud Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5885-934X","authenticated-orcid":false,"given":"Rapha\u00ebl","family":"Moeckli","sequence":"additional","affiliation":[{"name":"Institute of Radiation Physics Lausanne University Hospital Lausanne Vaud Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,11,25]]},"reference":[{"key":"e_1_2_9_2_1","volume-title":"Guidelines for the verification of imrt","author":"Markus A","year":"2008"},{"key":"e_1_2_9_3_1","unstructured":"SSRMP.Quality control for Intensity\u2010modulated radiation therapy Recommendations No. 15. 2007:17 p. 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