摘要
目的比较胸部CT常规剂量扫描与低剂量扫描在健康人群中进行肺结节筛查的价值。方法对300例健康体检者肺部CT扫描进行分析,比较常规剂量扫描与低剂量扫描筛查肺结节的图像质量、检出率和辐射剂量。结果常规剂量组、低剂量组两组图像质量评分比较,差异无统计学意义(t=1.08,P>0.05),均能满足诊断要求。常规剂量组150例检出肺结节22例34个,病理证实早期肺癌2例;低剂量组150例检出肺结节19例30个,病理证实早期肺癌1例,两者在检出率比较,差异无统计学意义(χ2=1.61,P>0.05)。而辐射剂量方面,常规剂量组的剂量长度乘积、平均有效管球剂量、总管球剂量和放射容积剂量指数分别为(492.64±43.96)m Gy·cm、(110.22±9.76)m As、(3110.36±143.34)m As和(9.53±2.63)m Gy,低剂量组分别为(153.22±18.45)m Gy·cm、(42.58±3.43)m As、(978.45±40.87)m As和(3.53±1.73)m Gy,两组比较,差异均有统计学意义(t分别=7.78、6.52、10.44、8.16,P均<0.05)。结论胸部低剂量螺旋CT扫描对肺结节的显示及检出与常规剂量相同,辐射剂量更小,更适合健康群体中肺结节的筛查。
Objective To compare the value of conventional-dose chest CT scans and low-dose CT for screening lung nodules in healthy population. Methods The lung CT scan image of 300 healthy individuals were analyzed, and the im-age quality, detection rate and radiation dose between the conventional-dose group and the low-dose group were compared. Results The image quality that all could meet the diagnostic requirements between two groups was not statistical different (t=1.08,P〉0.05). 34 pulmonary nodules of 22 cases were detected in the 150 cases of conventional-dose group, and 2 cases were histologically confirmed early stage lung cancer. 30 pulmonary nodules of 19 cases were detected in the 150 cases of low-dose group, and 1 case was histologically confirmed early lung cancer. The detection rate between the two groups was statistical different(χ2=1.61,P〉0.05). In the conventional group, the dose length product, effective mAs, total mAs and CT dose index volume were (492.64±43.96) mGy·cm,(110.22±9.76) mAs,(3110.36±143.34) mAs and (9.53± 2.63)mGy respectively while in the low-dose group were (153.22±18.45) mGy·cm,(42.58±3.43) mAs,(978.45±40.87) mAs and (3.53±1.73) mGy. The differences between two groups were significant (t=7.78, 6.52, 10.44, 8.16,P〉0.05). Conclusion The low-dose CT scan have same function with conventional dose in screening pulmonary nodules. Because of the lower radiation dose, it is more suitable for screening lung nodules in healthy population.
出处
《全科医学临床与教育》
2014年第6期633-635,共3页
Clinical Education of General Practice