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. 2020 May 15;10:8016. doi: 10.1038/s41598-020-64967-5

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© The Author(s) 2020

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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Procedure of bolus reconstruction using the SFM method. (a) The acquired pictures were imported into SFM workspace and 3D reconstruction was run. (b) The surface of the head phantom and the sphere calibration model. (c) The surface of head phantom with a bolus region marker line. (d) The surface of the sphere calibration model. (e) The registration deviation between the two surfaces from the SFM and Marching Cube from CT images. (f) Bolus viewed in the STL format file. (g) The bolus printed using ABS material. (h) The bolus was put in the right place on the head phantom surface.