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. 2019 Feb 4;9:1198. doi: 10.1038/s41598-018-37733-x

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Cross sectional film exposure through the Alderson phantom. The irradiations were done vertically down from above the phantom and the multislit collimator positioned just above the phantom at 295 mm from the source (Fig. 3). One film was positioned above the phantom, one below the first slice, and a third underneath the second slice. The dose merging out of the primary collimator was 16 Gy, and the dose reaching the multislit collimator on the phantom’s top surface was slightly below 6 Gy. For each exposure, the left, middle, and right columns show the cross sectional film exposure, the array profile, and the height of the phantom at which the exposure was made, respectively.