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. 2014 Sep 6;9:197. doi: 10.1186/1748-717X-9-197

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© Park et al.; licensee BioMed Central Ltd. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 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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Positions of treatment apparatus gantry used to generate a dual field for the anterior body position in TSEI. The spoiler was only used for 6 MeV TSEI beam. The gantry angle (θ) was ± 18.5° and 90 ± 18° for 4 MeV with no spoiler and 6 MeV with spoiler, respectively.