Kawasaki Toshio, Aoyama Takahiko, Yamauchi-Kawaura Chiyo, Fujii Keisuke, Koyama Shuji
Department of Radiological Technology, Kanagawa Children's Medical Center, Mutsukawa 2-138-4, Minami-ku, Yokohama 232-8555, Japan.
Radiat Prot Dosimetry. 2013;154(3):314-9. doi: 10.1093/rpd/ncs251. Epub 2012 Sep 26.
Organ and effective doses during paediatric chest radiographic examination were investigated for various tube voltages between 60 and 110 kV at a constant milliampere-second value and focus-to-film distance by using an in-phantom dose measuring system and a Monte Carlo (MC) simulation software (PCXMC), where the former was composed of 32 photodiode dosemeters embedded in various tissue and organ sites within a 6-y-old child anthropomorphic phantom. Lung doses obtained ranged from 0.010 to 0.066 mGy and effective doses from 0.004 to 0.025 mSv, where these doses varied by a factor of 6 with the change in the tube voltage. Effective doses obtained using the MC simulation software agreed with those obtained using the dose measuring system within 23 %, revealing the usefulness of PCXMC software for evaluating effective doses. The present study would provide helpful dose data for the selection of technical parameters in paediatric chest radiography in Japan.
通过使用体模内剂量测量系统和蒙特卡罗（MC）模拟软件（PCXMC），在毫安秒值和焦片距恒定的情况下，对60至110 kV之间的各种管电压下小儿胸部X线检查期间的器官剂量和有效剂量进行了研究。其中，前者由嵌入6岁儿童人体模型内不同组织和器官部位的32个光电二极管剂量计组成。获得的肺部剂量范围为0.010至0.066 mGy，有效剂量范围为0.004至0.025 mSv，这些剂量随管电压的变化相差6倍。使用MC模拟软件获得的有效剂量与使用剂量测量系统获得的有效剂量在23%以内相符，表明PCXMC软件在评估有效剂量方面的有用性。本研究将为日本小儿胸部X线摄影技术参数的选择提供有用的剂量数据。
