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. 2022 Sep 10;12:15282. doi: 10.1038/s41598-022-19498-6

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© The Author(s) 2022

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Dosimetric parameters for the (a, b) PTV, (c) rectum, and (d) bladder. For PTV, there were small differences between the single-institution models and big model in each case. Dosimetric parameters for the rectum calculated using the big model were lower than those calculated with the single-institution model. The volume ratio receiving 50% of the prescribed dose (V₅₀) for institution D had the maximum difference (37.2%) between the big model and single-institution model. For the bladder, the dosimetric parameters calculated with the big model were lower than or equivalent to those calculated with the single-institution model, except for institution D.

Dosimetric parameters for the (a, b) PTV, (c) rectum, and (d) bladder. For PTV, there were small differences between the single-institution models and big model in each case. Dosimetric parameters for the rectum calculated using the big model were lower than those calculated with the single-institution model. The volume ratio receiving 50% of the prescribed dose (V₅₀) for institution D had the maximum difference (37.2%) between the big model and single-institution model. For the bladder, the dosimetric parameters calculated with the big model were lower than or equivalent to those calculated with the single-institution model, except for institution D.