医院级CT辐射剂量及诊断剂量水平研究

探讨医院级各部位CT扫描辐射剂量及成人CT检查诊断剂量水平。采集2018年2月—2019年1月本院在GE Light Speed 16 CT设备上进行诊断性CT检查的全部成年人共15 440例的CT检查数据,按照检查部位进行分类,统计各部位的容积剂量指数(CTDI_vol)、剂量长度乘积(DLP)。使用SPSS 19统计软件分析CTDI_vol、DLP的四分位数并计算有效剂量(ED)。结果表明,各部位CTDI_vol的诊断剂量参考水平(DRL)值为:颅脑87.75 mGy、肺部8.09 mGy、上下腹15.82 mGy、上下腹盆腔15.79 mGy;各部位DLP的诊断剂量参考水平(DRL)值为:颅脑1 053.03 mGy·cm、肺部245.19 mGy·cm、上下腹269.96 mGy·cm、上下腹盆腔835.20 mGy·cm。研究中发现肺部CTDI_vol、DLP的DRL值(分别为8.09 mGy、245.19 mGy·cm)低于我国其他地区和其他国家的DRL值;60岁以下患者肺部CT检查CTDI_vol、DLP的DRL值低于8.09 mGy、245.19 mGy·cm,60岁以上患者肺部CT检查CTDI_vol、DLP的DRL值高于8.09 mGy、245.19 mGy·cm。通过研究可以确定医院级各部位CT检查辐射剂量及成人CT检查诊断剂量水平,能为优化CT检查扫描技术和监测辐射剂量提供基础。

Research on hospital-level CT radiation dose and diagnostic dose level

This work aims to study the CT scan radiation dose of the human anatomical region of hospital scale and diagnostic dose level of adult CT examination. A total of 15,440 CT scan data were collected from the anatomical regions of all adults who underwent diagnostic CT examinations on GE Light Speed 16 CT equipment from February 2018 to January 2019. The volumetric dose index (CTDI_vol) and the dose length product (DLP) of the patient’s anatomical region were counted according to the anatomical region classification. The quantities of CTDI_vol and DLP in the scan data were statistically analyzed using spss19 software and the effective dose (ED) was calculated. As a result, the DRL values of CTDI_vol in each anatomical region were as follows: 87.75 mGy for the brain, 8.09 mGy for the lungs, 15.82 mGy for the upper and lower abdomen, and 15.79 mGy for the upper and lower abdominal pelvis. The DRL values of DLP in each anatomical region were as follows: for the brain was 1 053.03 mGy cm, for the lung was 245.19 mGy cm, for the upper and lower abdomen was 269.96 mGy cm, for the upper and lower abdominal pelvic was 835.20 mGy cm. The DRL values of CTDI_vol and DLP in lung anatomical region (8.09 mGy, 245.19 mGy cm) were lower than those in other regions of China and other countries. The DRL values of CTDI_vol and DLP in patients under 60 year old were lower than 8.09 mGy and 245.19 mGy cm, and the DRL values of CTDI_vol and DLP in CT scan of patients over 60 year old were higher than 8.09 mGy and 245.19 mGy cm. Taking all together, according to the analysis of the research results, the CT radiation dose and the adult CT examination dose level of each anatomical area of the hospital can be determined, which provides a basis for optimizing the CT scanning technique and monitoring the radiation dose.