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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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(a) Exposure of a chromographic film to an array of 0.3-mm 320-kVp x-ray minibeams spaced 1.0 mm on-center. The merging point is 3.1 cm from the collimator. (b) Lateral profiles of the film image of (a), made for nine depth points ranging from 0 mm (entrance to the film) to 80 mm, which is beyond the merging point of the arrays, which is at about 31 mm.