{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,29]],"date-time":"2026-06-29T13:17:29Z","timestamp":1782739049179,"version":"3.54.5"},"reference-count":32,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2023,1,17]],"date-time":"2023-01-17T00:00:00Z","timestamp":1673913600000},"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":[[2023,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Purpose<\/jats:title><jats:p>The CyberKnife system is a specialized device for non\u2010coplanar irradiation; however, it possesses the geometric restriction that the beam cannot be irradiated from under the treatment couch. Prone positioning is expected to reduce the dose to normal lung tissue in spinal stereotactic body radiotherapy (SBRT) owing to the efficiency of beam arrangement; however, respiratory motion occurs. Therefore, the Xsight spine prone tracking (XSPT) system is used to reduce the effects of respiratory motion. The purpose of this study was to evaluate the motion\u2010tracking error of the spine in the prone position.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials and Methods<\/jats:title><jats:p>Data from all 25 patients who underwent spinal SBRT at our institution between April 2020 and February 2022 using CyberKnife (VSI, version 11.1.0) with the XSPT tracking system were retrospectively analyzed using log files. The tumor motion, correlation, and prediction errors for each patient were examined. Furthermore, to assess the potential relationships between the parameters, the relationships between the tumor\u2010motion amplitudes and correlation or prediction errors were investigated using linear regression.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The tumor\u2010motion amplitudes in each direction were as follows: superior\u2013inferior (SI), 0.51\u00a0\u00b1\u00a00.39\u00a0mm; left\u2013right (LR), 0.37\u00a0\u00b1\u00a00.29\u00a0mm; and anterior\u2013posterior (AP), 3.43\u00a0\u00b1\u00a01.63\u00a0mm. The overall mean correlation and prediction errors were 0.66\u00a0\u00b1\u00a00.48\u00a0mm and 0.06\u00a0\u00b1\u00a00.07\u00a0mm, respectively. The prediction errors were strongly correlated with the tumor\u2010motion amplitudes, whereas the correlation errors were not.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>This study demonstrated that the correlation error of spinal SBRT in the prone position is sufficiently small to be independent of the tumor\u2010motion amplitude. Furthermore, the prediction error is small, contributing only slightly to the tracking error. These findings will improve the understanding of how to compensate for respiratory\u2010motion uncertainty in the prone position.<\/jats:p><\/jats:sec>","DOI":"10.1002\/acm2.13910","type":"journal-article","created":{"date-parts":[[2023,1,18]],"date-time":"2023-01-18T07:11:00Z","timestamp":1674025860000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Respiratory motion tracking of spine stereotactic radiotherapy in prone position"],"prefix":"10.1002","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0302-553X","authenticated-orcid":false,"given":"Kazufusa","family":"Mizonobe","sequence":"first","affiliation":[{"name":"Division of Radiation Oncology Kobe Minimally Invasive Cancer Center  Chuo\u2010ku, Kobe Hyogo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hiroaki","family":"Akasaka","sequence":"additional","affiliation":[{"name":"Department of Chemical Engineering The 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