Assessing protection against radiation exposure after Prostate 125I brachytherapy
Assessing protection against radiation exposure after Prostate 125I brachytherapy
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DOI：
10.1016/j.brachy.2013.12.001
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发表时间：
2014-05-01
期刊：
影响因子：
1.9
通讯作者：
Shigematsu, Naoyuki
中科院分区：
文献类型：
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作者：
Hanada, Takashi;Yorozu, Atsunori;Shigematsu, Naoyuki
目的：通过测量不同前列腺I-125近距离放射治疗条件下的辐射，扩展辐射剂量率测量数据集。方法和材料：日本东京医学中心连续63例未入选患者的测量数据。在测量过程中考虑了不同因素的差异，如身体姿势、与皮肤表面的距离和测量方向。此外，还对主要由0.1 mm厚的铅组成的衬铅内衣的屏蔽效果进行了评估。结果：辐射照射因患者的体位而异，在距前皮肤表面30 cm处的辐射剂量率测量结果相差约40.0%。体重、体重指数和组织厚度与测量的辐射剂量率有很好的相关性。屏蔽导致的辐射暴露衰减量约为95.8%，与基于组织横向测量的衰减率相似。达到1mSv所需的平均时间分别为：站立位1.2天、7.6天和65.4天，仰卧位0.6天、4.6天和40.4天。结论：本研究获得了有关放射防护的补充信息，证实屏蔽物是减少暴露的有效工具。(C)2014年美国近距离放射治疗学会。爱思唯尔公司出版，版权所有。
PURPOSE: To expand the radiation dose rate measurement data set by measuring radiation under various prostate I-125 brachytherapy situations.METHODS AND MATERIALS: Measurements were obtained from 63 consecutive unselected patients at Tokyo Medical Center, Japan. Differences in factors during measurements, such as body postures, distances from the skin surface, and measurement directions were considered. Furthermore, shielding effects of lead-lined underwear, consisting mainly of 0.1-mm thickness of lead, were also assessed.RESULTS: Radiation exposure varies according to the patient's body posture, with results differing as much as approximately 40.0% in measured radiation dose rates at 30 cm from the anterior skin surface. Weight, body mass index, and tissue thickness showed good correlations with measured radiation dose rates. The magnitude of radiation exposure attenuation by shielding was approximately 95.8%, similar to the attenuation ratio based on tissue measurements made in the lateral direction. The respective mean times required to reach 1 mSv were 1.2, 7.6, and 65.4 days in the standing position and 0.6, 4.6, and 40.4 days in the supine position at the site of contact, and at 30 and 100 cm from the anterior skin surface.CONCLUSIONS: This study obtained supplemental information pertaining to radiological protection and confirmed that shielding can be an effective tool for reducing exposures. (c) 2014 American Brachytherapy Society. Published by Elsevier Inc. All rights reserved.