Two-dimensional Thermoluminescence Dosimetry Using Al2O3:Cr Ceramics for 4, 6, and 10 MV X-ray Beams
Two-dimensional Thermoluminescence Dosimetry Using Al2O3:Cr Ceramics for 4, 6, and 10 MV X-ray Beams
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DOI：
10.18494/sam.2020.2698
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发表时间：
2020-01-01
影响因子：
1.2
通讯作者：
Shinsho, Kiyomitsu
中科院分区：
文献类型：
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作者：
Yanagisawa, Shin;Maruyama, Daiki;Shinsho, Kiyomitsu
尽管二维（2D）热释光剂量计（tld）有其优点，但由于其不均匀性和低重复性，尚未取代薄膜剂量计。基于Al2O3:Cr陶瓷的二维TLD是一种很有前途的可重复使用的新型被动剂量计。2D Al2O3:Cr tld可用于单能x射线束机器人放射外科的几何检查测试和剂量分布验证。由于多能x射线束用于放射治疗，本文研究了4、6和10 MV x射线束流中二维Al2O3:Cr tld的场大小和水深对能量的依赖性。使用tld进行调强放疗计划验证。发现tld对每种能量都有较大的场大小依赖性，但在水深大于4 cm时，对每种能量的水深依赖性较小。利用TLDs对相对剂量分布进行了高精度的验证。
Despite their advantages, two-dimensional (2D) thermoluminescence dosimeters (TLDs) have not yet replaced film dosimeters owing to their nonuniformity and low repeatability. A 2D TLD based on Al2O3:Cr ceramics is a promising new reusable passive dosimeter. 2D Al2O3:Cr TLDs can be used for geometry check tests and dose distribution verification in robotic radiosurgery using monoenergetic X-ray beams. In this work, the dependence of energy on the field size and water depth of 2D Al2O3:Cr TLDs for 4, 6, and 10 MV X-ray beams was investigated, because multienergy X-ray beams are used in radiotherapy. Intensity-modulated radiotherapy plan verifications were performed using the TLDs. The TLDs were found to have a large field size dependence for each energy, but their water depth dependence was small at a water depth above 4 cm for each energy. The relative dose distributions were verified with high accuracy using the TLDs.