低剂量螺旋CT在肺部结节筛查中的应用价值

Comparison of low dose and standard chest CT scan

目的比较分析16排螺旋CT常规剂量与低剂量条件胸部扫描的辐射剂量比与检出率,为体检中应用低剂量胸部CT平扫提供扫描依据。方法回顾分析杭州市肿瘤医院的255例胸部CT平扫体检者,其中122例为常规剂量扫描,另133例为低剂量扫描,并对两组进行肺部疾病检出率及辐射剂量进行对比研究。结果常规组中有22例被检出有肺部病变。低剂量组中有18例查出有肺部病变。CT剂量指数(CTDIvol)常规剂量胸部平扫与低剂量胸部平扫之比为3.4:1,总辐射剂量(DLP)常规剂量胸部平扫与低剂量胸部平扫之比为2.6:1,可以看出常规剂量组所受辐射要远大于低剂量组,但病变检出率差异并不显著。结论低剂量胸部CT平扫值得在临床健康体检中推广应用。

OBJECTIVE To compare and analyze the radiation dose rate and the detection rate of 16 slice spiral CT in normal dose and low dose condition,and provide the basis for the application of low dose chest CT scan in physical examination.METHODS Retrospective analysis of 255 patients with chest CT scan.Among them,122 cases were routine dose scanning;the other 133 cases were low dose scanning.The detection rates of lung disease and radiation dose were compared between the two groups.RESULTS In the conventional group,22 patients were found to have pulmonary lesions,and 18 patients in the low dose group were found to have pulmonary lesions.The ratio of routine dose of chest plain scanning and low dose chest scan in CTDIvol was 3.4to 1.And in DLP it was 2.6to 1.It can be seen that the radiation dose in the conventional dose group is far greater than that of the low dose group,but the detection rate of lesions is not significant.CONCLUSIONS Low dose chest CT scan is worth popularizing in clinical health examination.