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. 2016 Nov 7;11:146. doi: 10.1186/s13014-016-0725-4

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 6 — ROC analysis of gantry angle errors. a, b and c are for gantry angle error magnitude of 1°, 2° and 3°, respectively. d AUC vs. error magnitude. Curves with AUC of 1.0 reduce to a single point on upper left corner. 1°–3° ATA thresholds were chosen for EPID technique