Academic Journal
A practical framework for routine verification of Spot Position Monitor coordinate consistency in scanned carbon-ion radiotherapy.
| Τίτλος: | A practical framework for routine verification of Spot Position Monitor coordinate consistency in scanned carbon-ion radiotherapy. |
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| Συγγραφείς: | Tsubouchi T; Department of Radiation Oncology, Piedmont Mountainside Hospital, Jasper, Georgia, USA., Hamatani N; Department of Medical Physics, Osaka Heavy Ion Therapy Center, Osaka, Japan., Komada A; Department of Medical Physics, Osaka Heavy Ion Therapy Center, Osaka, Japan., Takashina M; Department of Medical Physics, Osaka Heavy Ion Therapy Center, Osaka, Japan. |
| Πηγή: | Journal of applied clinical medical physics [J Appl Clin Med Phys] 2026 Oct; Vol. 27 (10), pp. e70844. |
| Τύπος έκδοσης: | Journal Article |
| Γλώσσα: | English |
| Στοιχεία περιοδικού: | Publisher: Wiley on behalf of American Association of Physicists in Medicine Country of Publication: United States NLM ID: 101089176 Publication Model: Print Cited Medium: Internet ISSN: 1526-9914 (Electronic) Linking ISSN: 15269914 NLM ISO Abbreviation: J Appl Clin Med Phys Subsets: MEDLINE |
| Imprint Name(s): | Publication: 2017- : Malden, MA : Wiley on behalf of American Association of Physicists in Medicine Original Publication: Reston, VA : American College of Medical Physics, c2000- |
| Ιατρικοί όροι (MeSH): | Heavy Ion Radiotherapy*/methods , Heavy Ion Radiotherapy*/instrumentation , Heavy Ion Radiotherapy*/standards , Radiotherapy Planning, Computer-Assisted*/methods , Particle Accelerators*/instrumentation , Quality Assurance, Health Care*/standards , Neoplasms*/radiotherapy , Phantoms, Imaging*, Radiotherapy, Intensity-Modulated/methods ; Humans ; Radiotherapy Dosage ; Algorithms |
| Περίληψη: | Background: Log file-based 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. Purpose: This study describes a practical framework for routine verification of SPM coordinate consistency using independent scintillator-based measurements in raster-scanning carbon-ion radiotherapy. Methods: Reference spot positions were measured at the isocenter plane using a scintillator-based detector. Corresponding SPM-recorded 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-transformation root-mean-square (RMS) residuals were used as a practical consistency metric reflecting the agreement between SPM-reported and independently measured spot positions under routine QA conditions. Results: After similarity transformation, the median RMS residual across all investigated accelerator energies and irradiation ports was 1.45 mm, with an interquartile range of 1.36-1.63 mm. No statistically significant difference was detected across accelerator energies, whereas a significant difference was observed among irradiation ports. Conclusions: The proposed framework provides a practical approach for routine verification of SPM coordinate consistency and for establishing facility-specific 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-specific baseline for monitoring the agreement between SPM-reported and independently measured spot coordinates under routine QA conditions. (© 2026 The Author(s). Journal of Applied Clinical Medical Physics published by Wiley Periodicals, LLC on behalf of The American Association of Physicists in Medicine.) |
| References: | Med Phys. 2013 Dec;40(12):121707. (PMID: 24320493) Front Oncol. 2021 May 28;11:666141. (PMID: 34123830) Med Phys. 2018 Apr;45(4):e53-e83. (PMID: 29443390) Med Phys. 2024 Mar;51(3):2239-2250. (PMID: 37877590) Med Phys. 2009 Sep;36(9):4197-212. (PMID: 19810494) Med Phys. 2013 Feb;40(2):021703. (PMID: 23387726) Phys Med Biol. 2019 Jan 29;64(3):035014. (PMID: 30540984) Phys Med Biol. 2012 Jun 7;57(11):R99-117. (PMID: 22571913) Med Phys. 2011 Mar;38(3):1313-38. (PMID: 21520843) Phys Med. 2013 May;29(3):295-303. (PMID: 22583979) In Vivo. 2024 Nov-Dec;38(6):2935-2944. (PMID: 39477399) PLoS One. 2019 Feb 14;14(2):e0212412. (PMID: 30763390) Phys Med Biol. 2022 Dec 15;67(24):. (PMID: 36327456) |
| Contributed Indexing: | Keywords: carbon ion radiotherapy; log file‐based psQA; spot position monitor |
| Entry Date(s): | Date Created: 20261006 Date Completed: 20261006 Latest Revision: 20261008 |
| Update Code: | 20261008 |
| PubMed Central ID: | PMC13639247 |
| DOI: | 10.1002/acm2.70844 |
| PMID: | 42834542 |
| Βάση Δεδομένων: | MEDLINE |
| ISSN: | 1526-9914 |
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| DOI: | 10.1002/acm2.70844 |