Chang S J, Hung S Y, Liu Y L, Jiang S H, Wu J
Institute of Nuclear Engineering and Science, National Tsing Hua University, Hsinchu, Taiwan, ROC Health Physics Division, Institute of Nuclear Energy Research, Taoyuan, Taiwan, ROC.
Department of Medical Imaging, Chi Mei Medical Center, Liouying, Tainan, Taiwan, ROC Department of Medical Imaging and Radiological Science, Central Taiwan University of Science and Technology, Taichung, Taiwan, ROC.
Radiat Prot Dosimetry. 2015 Nov;167(1-3):247-50. doi: 10.1093/rpd/ncv255. Epub 2015 May 4.
Reference man has been widely used for external and internal dose evaluation of radiation protection. The parameters of the mathematical model of organs suggested by the International Commission of Radiological Protection (ICRP) are adopted from the average data of Caucasians. However, the organ masses of Asians are significantly different from the data of Caucasians, leading to potentially dosimetric errors. In this study, a total of 40 volunteers whose heights and weights corresponded to the statistical average of Taiwanese adults were recruited. Magnetic resonance imaging was performed, and T2-weighted images were acquired. The Taiwanese reference man and woman were constructed according to the measured organ masses. The dose conversion coefficients (DCFs) for anterior-posterior (AP), posterior-anterior (PA), right lateral (RLAT) and left lateral (LLAT) irradiation geometries were simulated. For the Taiwanese reference man, the average differences of the DCFs compared with the results of ICRP-74 were 7.6, 5.1 and 11.1 % for 0.1, 1 and 10 MeV photons irradiated in the AP direction. The maximum difference reached 51.7 % for the testes irradiated by 10 MeV photons. The size of the trunk, the volume and the geometric position of organs can cause a significant impact on the DCFs for external exposure of radiation. The constructed Taiwanese reference man and woman can be used in radiation protection to increase the accuracy of dose evaluation for the Taiwanese population.
参考人已被广泛用于辐射防护的外照射和内照射剂量评估。国际放射防护委员会（ICRP）建议的器官数学模型参数采用白种人的平均数据。然而，亚洲人的器官质量与白种人的数据有显著差异，这可能导致剂量测定误差。在本研究中，共招募了40名身高和体重符合台湾成年人统计平均值的志愿者。进行了磁共振成像，并采集了T2加权图像。根据测量的器官质量构建了台湾参考男性和女性。模拟了前后（AP）、后前（PA）、右侧（RLAT）和左侧（LLAT）照射几何条件下的剂量转换系数（DCF）。对于台湾参考男性，在AP方向照射0.1、1和10 MeV光子时，DCF与ICRP-74结果的平均差异分别为7.6%、5.1%和11.1%。对于10 MeV光子照射的睾丸，最大差异达到51.7%。躯干的尺寸、器官的体积和几何位置对外照射辐射的DCF可能产生显著影响。构建的台湾参考男性和女性可用于辐射防护，以提高台湾人群剂量评估的准确性。
