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. 2021 Feb 25;31(9):6500–6510. doi: 10.1007/s00330-021-07764-6

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© The Author(s) 2021

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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Fig. 2 — CT-guided percutaneous iodine-125 seed brachytherapy. a Preoperative computed tomography (CT) scan. b, c Treatment plan and the dose-volume histogram calculated before brachytherapy, the prescribed dose of this patient was 130 Gy. d Intraoperative puncture procedure under the CT-guided. e, f Coverage and the distribution of implanted seeds, dose distribution on treatment planning system and the dose-volume histogram calculated after brachytherapy. D90 was 154.74Gy and V100 was 98.2%. PTV, planning treatment volume; D90, the dose covering 90% of the target tumor volume; V100, the percentage of the target tumor volume covered by 100% prescribed dose