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. 2016 Jul 29;11:98. doi: 10.1186/s13014-016-0677-8

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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. 2 — Equipment used in 4D analysis. The Catphan sits on the SI platform while the block sits on the AP platform. The motion of the block is recorded and used as the surrogate signal in 4D reconstruction