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. 2017 Feb 22;12:40. doi: 10.1186/s13014-017-0775-2

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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. 6 — a Average normal brain dose for each treatment plan, using two oblique angle irradiation for 3D-CRT and PBT, with sphere targets with the same diameter and different iso-centers at 0, 1, 2, 3, and 4 cm from the brain center. b Correlation between target position and difference in normal brain dose in PBT compared to 3DCRT or IMRT