摘要
目的评估低剂量CT扫描对早期肺癌诊断的临床应用价值。方法分析36例早期肺癌并经病理证实的患者,均为体检发现,并行低剂量CT扫描和常规剂量扫描,低剂量采用(120kV、25mAs),常规剂量采用(120kV、200mAs)扫描,对比分析两种扫描方法影像质量和放射剂量等因素有无差异性。结果低剂量CT扫描对病灶的显示与常规CT扫描无明显差异,但低剂量扫描图像噪声较大,不影响影像诊断。多层螺旋CT肺部低剂量扫描的权重CT剂量指数(CTDIw)为(1.5±0.2)mGy,常规剂量扫描为(7.3±1.3)mGy(P<0.01)。总的mAs低剂量扫描为(459±6.5)mAs,常规剂量CT扫描为(1421±8.7)mAs。剂量长度乘积(DLP):低剂量扫描为(44±7)mGy·cm,常规剂量扫描的(193±12)mGy·cm(P<0.01)。低剂量扫描最大有效辐射剂量为(0.85±0.1)mSv,常规剂量为(3.9±0.7)mSv(P<0.01)。结论肺部CT低剂量扫描对肺内病灶的显示与常规CT扫描无差别,并且可以明显减少患者的X线辐射剂量。
Objective To evaluate the value of Low- dose 64-slice spiral CT scanning in detecting early lung cancer. Methods Thirty-six patients of early-stage lung cancer patients who were detected by the routine checkup and confirmed with pathology were accepted low-dose CT scan （120 kV, 20 mAs） and the conventional dose scan （120 kV, 200 mAs）. The film quality and radiation dose were compared between the low-dose group and the conventional dose group. Results There was no difference between the two groups on displaying the tumor, but increasing the noise without affecting diagnosis for low-dose group. The weighted CT dose index （CTDIw） was （1.5±0.2） mGy for low-dose CT and （7.3±1.3）mGy for conventional CT（P〈 0. 01）. DLP[ （44±7）mGyocm] of low- dose CT was lower than that of conventional CT [（193±12 ）mGy-cm] （P〈 0. 01）. The total mAs of low-dose CT [（459±65） mAs] was significantly smaller than that of conventional dose CT scanning[ （1421±87） mAs]. The effective dose for low-dose CT scanning was 0.85 mSv, which was lower than that of conventional dose CT scanning [（3.9±0.7 ）mSv]. Conclusion Low-dose CT scan was not different with conventiona dose, which can markedly decrease X-ray radiation dose.
出处
《当代医学》
2013年第21期5-7,共3页
Contemporary Medicine
关键词
肺癌
低剂量CT
X线辐射剂量
Lung cancer
Low dose CT
X- ray radiation dose
