Takei Yasutaka, Miyazaki Osamu, Matsubara Kosuke, Shimada Yoshiya, Muramatsu Yoshihisa, Akahane Keiichi, Fujii Keisuke, Suzuki Shoichi, Koshida Kichiro
Pediatr Radiol. 2016 Feb;46(2):280-5. doi: 10.1007/s00247-015-3474-x.
Diagnostic reference levels (DRLs) have not been established in Japan.
To propose DRLs for CT of the head, chest and abdomen for three pediatric age groups.
We sent a nationwide questionnaire by post to 339 facilities. Questions focused on pediatric CT technology, exposure parameters, CT protocols, and radiation doses for age groups <1 year, 1-5 years, and 6-10 years.
For the three age groups in the 196 facilities that responded, the 75th percentile values of volume CT dose index based on a 16-cm phantom (CTDIvol 16 [mGy]) for head, chest and abdominal CT were for infants 39.1, 11.1 and 12.0, respectively; for 1-to 5-year-olds 46.9, 14.3 and 16.7, respectively; and for 6-to 10-year-olds 67.7, 15.0 and 17.0, respectively. The corresponding dose–length products (DLP 16 [mGy・cm]) for head, chest and abdominal CT were for infants 526.1, 209.1 and 261.5, respectively; for 1-to 5-year-olds 665.5, 296.0 and 430.8, respectively; and for 6-to 10-year-olds 847.9, 413.0 and 532.2, respectively.
The majority of CTDIvol 16 and DLP 16 values for the head were higher than DRLs reported from other countries. For risk reduction, it is necessary to establish DRLs for pediatric CT in Japan.
日本尚未制定诊断参考水平（DRLs）。
为三个儿科年龄组的头部、胸部和腹部CT提出诊断参考水平。
我们通过邮寄向全国339家机构发送了调查问卷。问题集中在儿科CT技术、曝光参数、CT协议以及1岁以下、1 - 5岁和6 - 10岁年龄组的辐射剂量。
在回复的196家机构中，对于这三个年龄组，基于16厘米体模的容积CT剂量指数（CTDIvol 16 [mGy]）在头部、胸部和腹部CT中的第75百分位数分别为：婴儿组39.1、11.1和12.0；1至5岁儿童组分别为46.9、14.3和16.7；6至10岁儿童组分别为67.7、15.0和17.0。头部、胸部和腹部CT相应的剂量长度乘积（DLP 16 [mGy·cm]）分别为：婴儿组526.1、209.1和261.5；1至5岁儿童组分别为665.5、296.0和430.8；6至10岁儿童组分别为847.9、413.0和532.2。
头部的大多数CTDIvol 16和DLP 16值高于其他国家报告的诊断参考水平。为降低风险，日本有必要制定儿科CT的诊断参考水平。
