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Contour points were divided into segments according to the 17\u2010segment model. For each patient, contour point displacements were determined for the long\u2010axis (all 17 segments) and short\u2010axis (segments 1\u201312) directions. Mean overall, tangential (longitudinal or circumferential), and normal (radial) displacements were calculated for the 17 segments and for each segment level.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The greatest overall motion was observed in the control group\u2014long axis: 4.5\u00a0\u00b1\u00a01.2\u00a0mm (segment 13 [apical anterior] epicardium) to 13.8\u00a0\u00b1\u00a03.0\u00a0mm (segment 6 [basal anterolateral] endocardium), short axis: 4.3\u00a0\u00b1\u00a00.8\u00a0mm (segment 9 [mid inferoseptal] epicardium) to 11.5\u00a0\u00b1\u00a02.3\u00a0mm (segment 1 [basal anterior] endocardium). HF patients exhibited lesser motion, with the smallest overall displacements observed in the HFrEF group\u2014long axis: 4.3\u00a0\u00b1\u00a01.7\u00a0mm (segment 13 [apical anterior] epicardium) to 10.6\u00a0\u00b1\u00a03.4\u00a0mm (segment 6 [basal anterolateral] endocardium), short axis: 3.9\u00a0\u00b1\u00a01.3\u00a0mm (segment 8 [mid anteroseptal] epicardium) to 7.4\u00a0\u00b1\u00a02.8\u00a0mm (segment 1 [basal anterior] endocardium).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>This analysis provides an estimate of epicardial and endocardial displacement for the 17 segments of the LV for patients with normal and impaired LV function. This reference data can be used to establish treatment planning margin guidelines for cardiac radioablation. Smaller margins may be used for patients with higher degree of impaired heart function, depending on the LV segment.<\/jats:p><\/jats:sec>","DOI":"10.1002\/acm2.14333","type":"journal-article","created":{"date-parts":[[2024,3,17]],"date-time":"2024-03-17T21:09:17Z","timestamp":1710709757000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Analysis of left ventricle regional myocardial motion for cardiac radioablation"],"prefix":"10.1002","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8406-6271","authenticated-orcid":false,"given":"Justin","family":"Poon","sequence":"first","affiliation":[{"name":"Department of Physics and Astronomy University of British Columbia  Vancouver British Columbia Canada"},{"name":"Department of Medical Physics BC Cancer  Vancouver British Columbia Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Richard 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