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We calculated the ellipticity ratio and all of the size surrogates presented in <jats:styled-content style=\"fixed-case\">AAPM<\/jats:styled-content> Reports 204\/220. We correlated the purely geometric\u2010based metrics with the \u201cgold standard\u201d water\u2010equivalent diameter (<jats:styled-content style=\"fixed-case\">D<jats:sub>W<\/jats:sub><\/jats:styled-content>).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Our results and <jats:styled-content style=\"fixed-case\">AAPM<\/jats:styled-content> Reports 204\/220 agree within our data's 95% confidence intervals. Outliers to the <jats:styled-content style=\"fixed-case\">AAPM<\/jats:styled-content> reports\u2019 methods were caused by excess gas in the <jats:styled-content style=\"fixed-case\">GI<\/jats:styled-content> tract, exceptionally low <jats:styled-content style=\"fixed-case\">BMI<\/jats:styled-content>, and cranial metaphyseal dysplasia. For the head, we show lower correlation (R<jats:sup>2<\/jats:sup> = 0.812) between effective diameter and <jats:styled-content style=\"fixed-case\">D<jats:sub>W<\/jats:sub><\/jats:styled-content> relative to other body regions. The ellipticity ratio of the shoulder region was the highest at 2.28 \u00b1 0.22 and the head the smallest at 0.85 \u00b1 0.08. The abdomen pelvis, chest, thorax, and abdomen regions all had ellipticity values near 1.5.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>We confirmed <jats:styled-content style=\"fixed-case\">AAPM<\/jats:styled-content> reports 204\/220 using clinical data and identified patient conditions causing discrepancies. We presented new size surrogate data for the head region and for the first time presented ellipticity data for all regions. Future automatic exposure control characterization should include ellipticity information.<\/jats:p><\/jats:sec>","DOI":"10.1002\/acm2.12223","type":"journal-article","created":{"date-parts":[[2017,11,27]],"date-time":"2017-11-27T05:55:20Z","timestamp":1511762120000},"page":"228-238","source":"Crossref","is-referenced-by-count":61,"title":["Evaluation of <scp>AAPM<\/scp> Reports 204 and 220: Estimation of effective diameter, water\u2010equivalent diameter, and ellipticity ratios for chest, abdomen, pelvis, and head <scp>CT<\/scp> scans"],"prefix":"10.1002","volume":"19","author":[{"given":"Christiane S.","family":"Burton","sequence":"first","affiliation":[{"name":"Department of Radiology University of Wisconsin\u2010Madison Madison WI USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Timothy P.","family":"Szczykutowicz","sequence":"additional","affiliation":[{"name":"Departments of Radiology, Medical Physics, and Biomedical Engineering University of 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