Fujii K, Akahane K, Miyazaki O, Horiuchi T, Shimada A, Nagmatsu H, Yamauchi M, Yamauchi-Kawaura C, Kawasaki T
Department of Radiation, National Cancer Center Hospital East, 6-5-1 Kashiwanoha, Kashiwa, Chiba, Japan.
Radiat Prot Dosimetry. 2011 Sep;147(1-2):151-5. doi: 10.1093/rpd/ncr289. Epub 2011 Jul 9.
The aim of this study is to evaluate organ doses in infant CT examinations with multi-detector row CT scanners. Radiation doses were measured with radiophotoluminescence glass dosemeters set in various organ positions within a 1-y-old child anthropomorphic phantom and organ doses were evaluated from the measurement values. Doses for tissues or organs within the scan range were 28-36 mGy in an infant head CT, 3-11 mGy in a chest CT, 5-11 mGy in an abdominal-pelvic CT and 2-14 mGy in a cardiac CT. The doses varied by the differences in the types of CT scanners and scan parameters used at each medical facility. Compared with those for children of various ages, the doses in an infant CT protocol were found to be similar to or slightly smaller than those in a paediatric CT for 5- or 6-y-old children.
本研究的目的是评估使用多排螺旋CT扫描仪进行婴儿CT检查时的器官剂量。通过将放射光致发光玻璃剂量计置于1岁儿童人体模型的不同器官位置来测量辐射剂量，并根据测量值评估器官剂量。扫描范围内组织或器官的剂量在婴儿头部CT中为28 - 36 mGy，胸部CT中为3 - 11 mGy，腹部盆腔CT中为5 - 11 mGy，心脏CT中为2 - 14 mGy。剂量因各医疗机构使用的CT扫描仪类型和扫描参数的不同而有所变化。与不同年龄段儿童的剂量相比，发现婴儿CT方案中的剂量与5或6岁儿童的儿科CT剂量相似或略小。
