{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T14:01:40Z","timestamp":1789740100113,"version":"4.0.1"},"reference-count":19,"publisher":"Wiley","issue":"8","license":[{"start":{"date-parts":[[2026,8,10]],"date-time":"2026-08-10T00:00:00Z","timestamp":1786320000000},"content-version":"vor","delay-in-days":9,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,8,1]],"date-time":"2026-08-01T00:00:00Z","timestamp":1785542400000},"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":["J Applied Clin Med Phys"],"published-print":{"date-parts":[[2026,8]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Magnetic resonance\u2013guided radiotherapy using 1.5 T MR\u2010LINAC systems introduces specific constraints for patient\u2010specific quality assurance (PSQA), requiring MR\u2010compatible dosimetric devices capable of accurate three\u2010dimensional dose verification. While previous studies have characterized the dosimetric performance of MR\u2010compatible detector arrays, the clinical implementation of rotational three\u2010dimensional QA systems in MR\u2010guided workflows remains insufficiently documented.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Purpose<\/jats:title>\n                    <jats:p>This study investigated the clinical implementation and practical performance of a motorized MR\u2010conditional OCTAVIUS 4D system for stereotactic body radiotherapy (SBRT) PSQA on a 1.5 T MR\u2010LINAC.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>The MR\u2010conditional OCTAVIUS 4D phantom equipped with a 1500 MR ionization chamber array was implemented for PSQA measurements on a Unity 1.5 T MR\u2010LINAC (Elekta, Stockholm, Sweden). A total of 40 clinical step\u2010and\u2010shoot treatment plans were analyzed with an SBRT prescription. The system was evaluated in terms of three\u2010dimensional dose reconstruction accuracy under clinically relevant off\u2010axis condition, angular positioning consistency with the gantry positioning, and integration into clinical workflow. Measured dose distributions were compared with treatment planning system (TPS) calculations using a 3D gamma analysis with a local 2.5%\/2.5\u00a0mm criterion and a 10% dose threshold. Independent angular measurements were additionally performed using a digital inclinometer.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>The system demonstrated high agreement between measured and calculated dose distributions, with a mean gamma passing rate of 98.3% (local 2.5%\/2.5\u00a0mm). All plans met institutional acceptance criteria (GPR \u2265 95%). Independent angular measurements demonstrated excellent agreement between gantry angle, phantom angle, and software\u2010reported angle, with deviations below 0.6\u00b0 and no systematic bias observed. No visible dependence of gamma passing rate on radial off\u2010axis target positioning was observed within the investigated clinical range. The evaluated beam arrangements included irregular angular spacing and clockwise\/counterclockwise gantry transitions during delivery, supporting effective synchronization between the OCTAVIUS 4D MR system and the Unity gantry under clinical step\u2010and\u2010shoot conditions.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>The motorized MR\u2010conditional OCTAVIUS 4D system demonstrated clinically feasible implementation for rotational three\u2010dimensional PSQA for SBRT on a 1.5 T MR\u2010LINAC. The system provided consistent dose reconstruction accuracy and reliable angular positioning under clinically relevant delivery conditions, supporting its integration into routine MR\u2010guided radiotherapy QA workflows.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/acm2.70736","type":"journal-article","created":{"date-parts":[[2026,8,10]],"date-time":"2026-08-10T12:57:21Z","timestamp":1786366641000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Clinical implementation and performance evaluation of a motorized MR\u2010compatible OCTAVIUS 4D system for SBRT patient\u2010specific QA on a 1.5 T MR\u2010LINAC"],"prefix":"10.1002","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-5698-8502","authenticated-orcid":false,"given":"Clement","family":"Chevillard","sequence":"first","affiliation":[{"name":"Department of Radiation Oncology Service of Medical Physics, Institut Curie  Saint Cloud France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marie","family":"Blanchet","sequence":"additional","affiliation":[{"name":"Department of Radiation Oncology Service of Medical Physics, Institut Curie  Saint Cloud France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cyrielle","family":"Mella","sequence":"additional","affiliation":[{"name":"Department of Radiation Oncology Service of Medical Physics, Institut Curie  Saint Cloud France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robin","family":"Sauvinet","sequence":"additional","affiliation":[{"name":"Department of Radiation Oncology Service of Medical Physics, Institut Curie  Saint Cloud France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rezart","family":"Belshi","sequence":"additional","affiliation":[{"name":"Department of Radiation Oncology Service of Medical Physics, Institut Curie  Saint Cloud France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ivan","family":"Taranenko","sequence":"additional","affiliation":[{"name":"Elekta Limited, Cornerstone  Crawley West Sussex UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,8,10]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/mp.12810"},{"key":"e_1_2_11_3_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.3238104"},{"key":"e_1_2_11_4_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.2167371"},{"key":"e_1_2_11_5_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.1591194"},{"key":"e_1_2_11_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijrobp.2008.08.055"},{"key":"e_1_2_11_7_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.3514120"},{"key":"e_1_2_11_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.bulcan.2020.10.002"},{"key":"e_1_2_11_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ctro.2019.04.007"},{"key":"e_1_2_11_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.radonc.2018.12.011"},{"key":"e_1_2_11_11_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00261-016-0680-4"},{"key":"e_1_2_11_12_1","doi-asserted-by":"publisher","DOI":"10.1002\/mp.14764"},{"key":"e_1_2_11_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.radonc.2020.02.010"},{"key":"e_1_2_11_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.phro.2022.06.005"},{"key":"e_1_2_11_15_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.zemedi.2023.12.003"},{"key":"e_1_2_11_16_1","doi-asserted-by":"publisher","DOI":"10.1088\/1361-6560\/ad67a2"},{"key":"e_1_2_11_17_1","doi-asserted-by":"publisher","DOI":"10.1007\/s13246-022-01113-7"},{"key":"e_1_2_11_18_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0167-8140(01)00497-2"},{"key":"e_1_2_11_19_1","doi-asserted-by":"publisher","DOI":"10.1002\/mp.12810"},{"key":"e_1_2_11_20_1","unstructured":"RomagueraT MittauerK AlvarezD et\u00a0al.MR\u2010guided patient specific QA devices single plane ionization array versus orthogonal diode plans.Dept. of Radiat. 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