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In this study, we report on the impact of an image review quality assurance process performed prior to treatment planning by medical physicists for 4DCT scans used for SABR treatment. Reviews were performed of 211 4DCT scans (193 patients) over a 3\u2010yr period (October 2014 to October 2017). Treatment sites included lung (n\u00a0=\u00a0168), kidney\/adrenal\/adrenal gland (n\u00a0=\u00a012), rib (n\u00a0=\u00a04), mediastinum (n\u00a0=\u00a010), liver (n\u00a0=\u00a02), T\u2010spine (n\u00a0=\u00a01), and other abdominal sites (n\u00a0=\u00a014). It was found that in 23% (n\u00a0=\u00a049) of cases patient management was altered due to the review process. The most frequent intervention involved patient\u2010specific contouring advice (n\u00a0=\u00a035 cases, 17%) including adjustment of internal target volume (ITV) margins. In 13 cases (6%) a rescan was requested due to extensive motion artifact rendering the scan inadequate for SABR treatment planning. 4DCT review by medical physicists was found to be an effective method to improve plan quality for SABR.<\/jats:p>","DOI":"10.1002\/acm2.12825","type":"journal-article","created":{"date-parts":[[2020,2,13]],"date-time":"2020-02-13T13:39:41Z","timestamp":1581601181000},"page":"62-67","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["Independent review of 4DCT scans used for SABR treatment planning"],"prefix":"10.1002","volume":"21","author":[{"given":"Rachitha","family":"Antony","sequence":"first","affiliation":[{"name":"Department of Physical Sciences Peter MacCallum Cancer Centre Melbourne Vic Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peta","family":"Lonski","sequence":"additional","affiliation":[{"name":"Department of Physical Sciences Peter MacCallum 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