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. 2017 Dec 5;12:180. doi: 10.1186/s13014-017-0918-5

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© The Author(s). 2017

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. 1 — Prone (a) and supine (b) VMAT rectum treatment plans. Axial and coronal slices are shown. The arrows indicate the VMAT arcs, which were always posteriorly applied. The supine VMAT plan necessarily has two arcs due to the Elekta linacs’ inability to over-travel past gantry angle 180°. c A carbon fiber belly board used for prone setup of rectal cancer patients. The belly board is setup on a Hexapod couch in this image (not used for rotational correction for rectal cancer patients at our center). The top of the belly board is 89 cm above the floor at the lowest position