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. 2016 May 20;4:16. doi: 10.1186/s40349-016-0059-6

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© Temple et al. 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. 3 — Bubble test. A coronal skin bubble scan (balanced fast gradient echo sequence) showing a 1-cm air bubble trapped between the patient and the acoustic coupling pad. If this bubble is not removed from the beam path, a skin burn could occur due to the treatment