Radimetrics系统在CT辐射剂量评估上的初步应用

Preliminary application of the Radimetrics system in CT radiation dose evaluation

目的 通过Radimetrics系统对CT辐射剂量的数据分析,评估扫描方案能否达到辐射防护的要求.方法 把Toshiba Aquilion 64排和Siemens Emotion 16排CT的3980例患者数据自动传输到Radimetrics工作站,并生成患者靶组织及敏感组织辐射剂量报表,采用SPSS17.0统计学软件统计出头颅、胸部、腹部、盆腔CT检查的辐射剂量分布情况并行t检验.结果 （1）头颅、胸部、腹部、盆腔CT平扫的辐射剂量的中位值分别为2.31、4.82、3.65、4.48 mSv;增强扫描的辐射剂量的中位值分别为4.58、9.58、10.51、8.71 mSv.（2）多数患者辐射剂量在ICRP103报告书范围内,仅有80例超出范围;（3）与扫描部位越邻近的组织,受到的辐射剂量越大;（4）动脉期、静脉期的辐射剂量低于平扫;（5）64排CT辐射剂量小于16排CT.结论 Radimetrics系统可通过对CT辐射剂量分析来有效评估扫描方案的合理性.

Objective To analyze large data on CT radiation dose through the Radimetrics system by evaluating the CT scan program to meet radiation protection requirements. Methods The radiation dose report of target tissue and sensitive tissue of 3980 patients was generated by immediately transferring the data from Toshiba Aquilion 64 rows CT and Siemens Emotion 16 rows CT to the Radimetrics workstation. The radiation dose distribution of CT in the head, chest, abdomen, and pelvis were analyzed, and then t-test was used for data analysis using SPSS17.0 software. Results （1） The radiation doses of head, chest, abdominal, and pelvic CT were 2.31, 4.82, 3.65, and 4.48 mSv, respectively, and their enhanced CT scan results were 4.58, 9.58, 10.51, and 8.71 mSv, respectively; （2） The majority of patients received the radiation doses in the range of ICRP103, and only 80 patients received beyond the range of ICRP103;（3） As the highly sensitive tissue approached the scanning area, the radiation dose increased;（4） The radiation doses of the arterial and venous phases were lower than that of plain scan;（5） The radiation dose of 64 rows CT was lower than that of 16 rows CT. Conclusion The Radimetrics system can effectively evaluate the radiation protection rationality of the CT scan program through analyzing CT radiation dose.