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. 2015 Nov 19;10:235. doi: 10.1186/s13014-015-0544-z

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© Li et al. 2015

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. 4 — Dose distributions in the junction regions of arc beams with different isocenters and collimator angles. The upper and lower parts were the measured (by films) and calculated dose distributions, respectively. From Part a to Part f: the collimator angles of the upper and lower arc beams were 0°/0°, 0°/5°, 30°/30°, 45°/45°, 0°/NA, 30°/NA, respectively. The Part e and Part f were the dose distributions of the beams with the upper isocenter. The dose was normalized to 180cGy