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. 2016 Dec 1;2:5. doi: 10.1186/s41205-016-0008-6

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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.

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Fig. 4 — Settings for minimal (1) and maximal (2) attenuation thresholds, naming the ROI (3), and options (4)