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Phys. Eng. Express"],"published-print":{"date-parts":[[2024,3,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>\n                  <jats:italic>Purpose.<\/jats:italic> Cardiac radiosurgery is a non-invasive treatment modality for ventricular tachycardia, where a linear accelerator is used to irradiate the arrhythmogenic region within the heart. In this work, cardiac magnetic resonance (CMR) cine images were used to quantify left ventricle (LV) segment-specific motion during the cardiac cycle and to assess potential advantages of cardiac-gated radiosurgery. <jats:italic>Methods.<\/jats:italic> CMR breath-hold cine images and LV contour points were analyzed for 50 controls and 50 heart failure patients with reduced ejection fraction (HFrEF, EF &lt; 40%). Contour points were divided into anatomic segments according to the 17-segment model, and each segment was treated as a hypothetical treatment target. The optimum treatment window (one fifth of the cardiac cycle) was determined where segment centroid motion was minimal, then the maximum centroid displacement and treatment area were determined for the full cardiac cycle and for the treatment window. Mean centroid displacement and treatment area reductions with cardiac gating were determined for each of the 17 segments. <jats:italic>Results.<\/jats:italic> Full motion segment centroid displacements ranged between 6\u201314 mm (controls) and 4\u201311 mm (HFrEF). Full motion treatment areas ranged between 129\u2013715 mm<jats:sup>2<\/jats:sup> (controls) and 149\u2013766 mm<jats:sup>2<\/jats:sup> (HFrEF). With gating, centroid displacements were reduced to 1 mm (controls and HFrEF), while treatment areas were reduced to 62\u2013349 mm<jats:sup>2<\/jats:sup> (controls) and 83\u2013393 mm<jats:sup>2<\/jats:sup> (HFrEF). Relative treatment area reduction ranged between 38%\u201353% (controls) and 26%\u201348% (HFrEF). <jats:italic>Conclusion.<\/jats:italic> This data demonstrates that cardiac cycle motion is an important component of overall target motion and varies depending on the anatomic cardiac segment. Accounting for cardiac cycle motion, through cardiac gating, has the potential to significantly reduce treatment volumes for cardiac radiosurgery.<\/jats:p>","DOI":"10.1088\/2057-1976\/ad29a4","type":"journal-article","created":{"date-parts":[[2024,2,15]],"date-time":"2024-02-15T22:22:31Z","timestamp":1708035751000},"page":"025040","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":8,"title":["Left ventricle segment-specific motion assessment for cardiac-gated radiosurgery"],"prefix":"10.1088","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8406-6271","authenticated-orcid":false,"given":"Justin","family":"Poon","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Richard B","family":"Thompson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marc W","family":"Deyell","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Devin","family":"Schellenberg","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kirpal","family":"Kohli","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Steven","family":"Thomas","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"266","published-online":{"date-parts":[[2024,2,29]]},"reference":[{"key":"bpexad29a4bib1","doi-asserted-by":"publisher","first-page":"630","DOI":"10.1097\/FJC.0b013e318207a35f","article-title":"Fibrosis and cardiac arrhythmias","volume":"57","author":"de Jong","year":"2011","journal-title":"J. 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