中文摘要：

目的测量PET/CT检查受检者所受的计算机断层扫描（CT）及^18F-FDG药物的辐射剂量,分析降低PET/CT辐射有效剂量的可能性。方法入选98例接受PET/CT检查的患者。CT扫描所致辐射有效剂量采用剂量长度乘积（DLP）值估计,^18F-FDG所致辐射的有效剂量根据ICRP推荐的方法进行估算,两剂量相加得到PET/CT受检者所受辐射的总有效剂量。结果患者进行PET/CT检查时,注射^18FFDG所致辐射的有效剂量为3.82-12.37 mSv,平均（5.84±1.06）mSv;CT扫描所致辐射的有效剂量为4.25-14.73 mSv,平均（6.37±1.74）mSv;PET/CT显像所致辐射的总有效剂量为8.1818.30 mSv,平均（12.34±2.49）mSv。结论 CT扫描所致辐射的有效剂量占总有效剂量一半以上,降低管电流和^18F-FDG药物活度将有效降低PET/CT受检所致辐射有效剂量。

英文摘要：

Objective To estimate the radiation dose induced by computed tomography （CT） and 18F- FDG for patients undergoing PET/CT, and to analyze the possibility of reducing the radiation dose.Methods S ixty-eight patients who underwent PET/CT were enrolled in the study. The effective doses for patients were obtained from CT scan by dose-length product and effective dose of 18F-FDG radiation was estimated according to the recommendations by ICRP, the total effective dose of PET/CT was the sum of the two doses. Results The average of PET/CT effective doses from PET and CT were （ 6.37 ± 1.74） mSv （ range ： 4.25 - 14.73mSv） and （5.84±1.06） mSv （range： 3.82- 12.37mSv）, respectively, resulting in the total patient dose of （12.34±2.49） mSv （range： 8.18 ± 18.30mSv）. Conclusions The effective dose of radiation caused by CT scan is more than half of the total effective dose, and the decrease of the tube current and the 18F-FDG activity will reduce the effective dose of PET/CT.