{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T05:52:05Z","timestamp":1791265925439,"version":"4.1.0"},"reference-count":13,"publisher":"Wiley","issue":"10","license":[{"start":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T00:00:00Z","timestamp":1791158400000},"content-version":"vor","delay-in-days":4,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T00:00:00Z","timestamp":1790812800000},"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":[[2026,10]]},"abstract":"Abstract<\/jats:title>\n \n Background<\/jats:title>\n Log file\u2013based patient specific quality assurance (PSQA) in scanned particle therapy relies on the consistency of spot position information recorded by the spot position monitor (SPM), but practical methods for routine independent verification of these coordinates remain limited.<\/jats:p>\n <\/jats:sec>\n \n Purpose<\/jats:title>\n This study describes a practical framework for routine verification of SPM coordinate consistency using independent scintillator\u2010based measurements in raster\u2010scanning carbon\u2010ion radiotherapy.<\/jats:p>\n <\/jats:sec>\n \n Methods<\/jats:title>\n Reference spot positions were measured at the isocenter plane using a scintillator\u2010based detector. Corresponding SPM\u2010recorded spot coordinates were extracted from delivery log files. The two coordinate sets were aligned using a similarity transformation accounting for translation, rotation, and isotropic scaling. Post\u2010transformation root\u2010mean\u2010square (RMS) residuals were used as a practical consistency metric reflecting the agreement between SPM\u2010reported and independently measured spot positions under routine QA conditions.<\/jats:p>\n <\/jats:sec>\n \n Results<\/jats:title>\n After similarity transformation, the median RMS residual across all investigated accelerator energies and irradiation ports was 1.45\u00a0mm, with an interquartile range of 1.36\u20131.63\u00a0mm. No statistically significant difference was detected across accelerator energies, whereas a significant difference was observed among irradiation ports.<\/jats:p>\n <\/jats:sec>\n \n Conclusions<\/jats:title>\n The proposed framework provides a practical approach for routine verification of SPM coordinate consistency and for establishing facility\u2010specific baselines through longitudinal monitoring. The RMS residual should not be interpreted as the intrinsic positional error of the SPM alone, but to provide a framework for establishing a facility\u2010specific baseline for monitoring the agreement between SPM\u2010reported and independently measured spot coordinates under routine QA conditions.<\/jats:p>\n <\/jats:sec>","DOI":"10.1002\/acm2.70844","type":"journal-article","created":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T05:01:27Z","timestamp":1791262887000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A practical framework for routine verification of Spot Position Monitor coordinate consistency in scanned carbon\u2010ion radiotherapy"],"prefix":"10.1002","volume":"27","author":[{"given":"Toshiro","family":"Tsubouchi","sequence":"first","affiliation":[{"name":"Department of Radiation Oncology Piedmont Mountainside Hospital Jasper Georgia USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9883-4852","authenticated-orcid":false,"given":"Noriaki","family":"Hamatani","sequence":"additional","affiliation":[{"name":"Department of Medical Physics Osaka Heavy Ion Therapy Center Osaka Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Akira","family":"Komada","sequence":"additional","affiliation":[{"name":"Department of Medical Physics Osaka Heavy Ion Therapy Center Osaka Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Masaaki","family":"Takashina","sequence":"additional","affiliation":[{"name":"Department of Medical Physics Osaka Heavy Ion Therapy Center Osaka Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,10,5]]},"reference":[{"key":"e_1_2_12_2_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.3190392"},{"key":"e_1_2_12_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/mp.12810"},{"key":"e_1_2_12_4_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.3514120"},{"key":"e_1_2_12_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ejmp.2012.04.005"},{"key":"e_1_2_12_6_1","doi-asserted-by":"publisher","DOI":"10.1088\/0031\u20109155\/57\/11\/R99"},{"key":"e_1_2_12_7_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.4828845"},{"key":"e_1_2_12_8_1","doi-asserted-by":"publisher","DOI":"10.21873\/invivo.13776"},{"key":"e_1_2_12_9_1","doi-asserted-by":"publisher","DOI":"10.1088\/1361\u20106560\/aca003"},{"key":"e_1_2_12_10_1","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0212412"},{"key":"e_1_2_12_11_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.4773312"},{"key":"e_1_2_12_12_1","doi-asserted-by":"publisher","DOI":"10.1088\/1361\u20106560\/aaf82d"},{"key":"e_1_2_12_13_1","doi-asserted-by":"publisher","DOI":"10.3389\/fonc.2021.666141"},{"issue":"3","key":"e_1_2_12_14_1","doi-asserted-by":"crossref","first-page":"2239","DOI":"10.1002\/mp.16791","article-title":"Beam delivery characteristics of the Hitachi carbon ion scanning system at Osaka Heavy Ion Medical Accelerator in Kansai (HIMAK)","volume":"51","author":"Tsubouchi T","year":"2024","journal-title":"Med Phys"}],"container-title":["Journal of Applied Clinical Medical Physics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/aapm.onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/acm2.70844","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/aapm.onlinelibrary.wiley.com\/doi\/full-xml\/10.1002\/acm2.70844","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/aapm.onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/acm2.70844","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T05:01:28Z","timestamp":1791262888000},"score":1,"resource":{"primary":{"URL":"https:\/\/aapm.onlinelibrary.wiley.com\/doi\/10.1002\/acm2.70844"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,10]]},"references-count":13,"journal-issue":{"issue":"10","published-print":{"date-parts":[[2026,10]]}},"alternative-id":["10.1002\/acm2.70844"],"URL":"https:\/\/doi.org\/10.1002\/acm2.70844","archive":["Portico"],"relation":{},"ISSN":["1526-9914","1526-9914"],"issn-type":[{"value":"1526-9914","type":"print"},{"value":"1526-9914","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,10]]},"assertion":[{"value":"2026-06-16","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2026-09-23","order":2,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2026-10-05","order":3,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}],"article-number":"e70844"}}