HDR Brachytherapy Dose Distribution is Influenced by the Metal Material of the Applicator

Chin Hui Wu, Yi Jen Liao, An Cheng Shiau, Hsin Yu Lin, Yen Wan Hsueh Liu, Shih Ming Hsu

研究成果: 雜誌貢獻文章同行評審

摘要

Applicators containing metal have been widely used in recent years when applying brachytherapy to patients with cervical cancer. However, the high dose rate (HDR) treatment-planning system (TPS) that is currently used in brachytherapy still assumes that the treatment environment constitutes a homogeneous water medium and does not include a dose correction for the metal material of the applicator. The primary purpose of this study was to evaluate the HDR 192 Ir dose distribution in cervical cancer patients when performing brachytherapy using a metal-containing applicator. Thermoluminescent dosimeter (TLD) measurements and Monte Carlo N-Particle eXtended (MCNPX) code were used to explore the doses to the rectum and bladder when using a Henschke applicator containing metal during brachytherapy. When the applicator was assumed to be present, the absolute dose difference between the TLD measurement and MCNPX simulation values was within approximately 5%. A comparison of the MCNPX simulation and TPS calculation values revealed that the TPS overestimated the International Commission of Radiation Units and Measurement (ICRU) rectum and bladder reference doses by 57.78% and 49.59%, respectively. We therefore suggest that the TPS should be modified to account for the shielding effects of the applicator to ensure the accuracy of the delivered doses.

原文英語
文章編號17863
期刊Scientific Reports
5
DOIs
出版狀態已發佈 - 12月 11 2015

ASJC Scopus subject areas

  • 多學科

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