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Contouring variations were assessed using the intraclass correlation coefficient (<jats:styled-content style=\"fixed-case\">ICC<\/jats:styled-content>), Dice similarity coefficient (<jats:styled-content style=\"fixed-case\">DSC<\/jats:styled-content>), and multiple additional metrics.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Clinical target volume (<jats:styled-content style=\"fixed-case\">CT<\/jats:styled-content> and <jats:styled-content style=\"fixed-case\">MR<\/jats:styled-content>), bladder, rectum and <jats:styled-content style=\"fixed-case\">PRS<\/jats:styled-content> contours showed excellent inter\u2010observer agreement (median <jats:styled-content style=\"fixed-case\">ICC<\/jats:styled-content>\u00a0=\u00a00.97; 0.99; 1.00; 0.95; 0.90, <jats:styled-content style=\"fixed-case\">DSC<\/jats:styled-content>\u00a0=\u00a00.83\u00a0\u00b1\u00a00.05; 0.88\u00a0\u00b1\u00a00.05; 0.93\u00a0\u00b1\u00a00.03; 0.81\u00a0\u00b1\u00a00.07; 0.80\u00a0\u00b1\u00a00.06, respectively). Seminal vesicle contours were more variable (<jats:styled-content style=\"fixed-case\">ICC<\/jats:styled-content>\u00a0=\u00a00.75, <jats:styled-content style=\"fixed-case\">DSC<\/jats:styled-content>\u00a0=\u00a00.73\u00a0\u00b1\u00a00.14), while colon and bowel bag contoured volumes were consistent (<jats:styled-content style=\"fixed-case\">ICC<\/jats:styled-content>\u00a0=\u00a00.97; 0.97), but displayed poor overlap (<jats:styled-content style=\"fixed-case\">DSC<\/jats:styled-content>\u00a0=\u00a00.58\u00a0\u00b1\u00a00.22; 0.67\u00a0\u00b1\u00a00.21). Smaller <jats:styled-content style=\"fixed-case\">MR<\/jats:styled-content> structures showed significant inter\u2010observer variations, with poor overlap for trigone, membranous urethra, penile bulb, and left and right neurovascular bundles (<jats:styled-content style=\"fixed-case\">DSC<\/jats:styled-content>\u00a0=\u00a00.44\u00a0\u00b1\u00a00.22; 0.41\u00a0\u00b1\u00a00.21; 0.66\u00a0\u00b1\u00a00.21; 0.16\u00a0\u00b1\u00a00.17; 0.15\u00a0\u00b1\u00a00.15). Pelvic floor muscles recorded moderate to strong inter\u2010observer agreement (<jats:styled-content style=\"fixed-case\">ICC<\/jats:styled-content>\u00a0=\u00a00.50\u20130.97), although large outlier variations were observed.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Inter\u2010observer contouring variation was significant for multiple pelvic structures contoured on <jats:styled-content style=\"fixed-case\">MR<\/jats:styled-content>.<\/jats:p><\/jats:sec>","DOI":"10.1111\/1754-9485.12844","type":"journal-article","created":{"date-parts":[[2019,1,4]],"date-time":"2019-01-04T19:07:58Z","timestamp":1546628878000},"page":"264-271","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":32,"title":["Multi\u2010observer contouring of male pelvic anatomy: Highly variable agreement across conventional and emerging structures of 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