{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,27]],"date-time":"2026-05-27T19:38:13Z","timestamp":1779910693662,"version":"3.53.1"},"reference-count":30,"publisher":"Wiley","issue":"10","license":[{"start":{"date-parts":[[2023,6,22]],"date-time":"2023-06-22T00:00:00Z","timestamp":1687392000000},"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":[[2023,10]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Purpose<\/jats:title><jats:p>To investigate the impact of MRI patient\u2010specific geometrical distortion (PSD) on the quality of Gamma Knife stereotactic radiosurgery (GK\u2010SRS) plans of the vestibular schwannoma (VS) tumors.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods and materials<\/jats:title><jats:p>Three open access datasets including the MPI\u2010Leipzig Mind\u2010Brain\u2010Body (318 patients), the slow event\u2010related fMRI designs dataset (62 patients), and the VS dataset (242 patients) were used. We used first two datasets to train a 3D convolution network to predict the distortion map of third dataset that were then used to calculate and correct the PSD. GK\u2010SRS plans of VS dataset were used to evaluate dose distribution of PSD\u2010corrected MRI images. GK\u2010SRS prescription dose of VS cases was 12\u00a0Gy. Geometric and dosimetric discrepancies were assessed between the dose distributions and contours before and after the PSD corrections. Geometry indices were center of the contours, Dice coefficient (DC), Hausdorff distance (HD), and dosimetric indices were , , , and  doses, target coverage (TC), Paddick's conformity index (PCI), Paddick's gradient index (GI), and homogeneity index (HI).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Geometric distortions of about 1.2\u00a0mm were observed at the air\u2010tissue interfaces at the air canal and nasal cavity borders. Average center of the targets was significantly distorted along the frequency encoding direction after the PSD\u2010correction. Average DC and HD metrics were 0.90 and 2.13\u00a0mm. Average ,  and  in Gy significantly increased after PSD correction from 16.85 to 17.25, 12.30 to 12.77, and from 8.98 to 9.92.  did not significantly change after the correction. Average TC and PCI significantly increased from 0.97 to 0.98, and 0.94 to 0.96. Average GI decreased significantly from 2.24 to 2.15 after PSD correction. However, HI did not significantly change after the correction.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>The proposed method could predict and correct the PSD that indicates the importance of PSD correction before GK\u2010SRS plans of the VS patients.<\/jats:p><\/jats:sec>","DOI":"10.1002\/acm2.14072","type":"journal-article","created":{"date-parts":[[2023,6,24]],"date-time":"2023-06-24T17:45:38Z","timestamp":1687628738000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Patient\u2010specific geometrical distortion corrections of MRI images improve dosimetric planning accuracy of vestibular schwannoma treated with gamma knife stereotactic radiosurgery"],"prefix":"10.1002","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3295-328X","authenticated-orcid":false,"given":"Mojtaba","family":"Safari","sequence":"first","affiliation":[{"name":"D\u00e9partement de physique de g\u00e9nie physique et d'optique et Centre de recherche sur le cancer Universit\u00e9 Laval Qu\u00e9bec Qu\u00e9bec Canada"},{"name":"Service de physique m\u00e9dicale et de radioprotection Centre Int\u00e9gr\u00e9 de Canc\u00e9rologie CHU de Qu\u00e9bec\u2010Universit\u00e9 Laval et Centre de recherche du CHU de Qu\u00e9bec Qu\u00e9bec Qu\u00e9bec Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ali","family":"Fatemi","sequence":"additional","affiliation":[{"name":"Department of Physics Jackson State University Mississippi USA"},{"name":"Merit Health Central Department of Radiation Oncology Gamma Knife Center Mississippi USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Younes","family":"Afkham","sequence":"additional","affiliation":[{"name":"Clinical Research Development Unit of Tabriz Valiasr Hospital Tabriz University of Medical Science Tabriz 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