不同剂量前门控心脏冠状动脉多层螺旋CT成像的比较

Comparison of Multi-slice Spiral CT Imaging of Different Doses of Prospective Gated Axial Scan for Cardiac Coronary Artery

目的比较不同剂量前瞻性门控轴面扫描心脏冠状动脉多层螺旋CT成像质量及辐射剂量。方法抽取通过前瞻性门控轴面扫描拟行心脏冠状动脉成像的80例患者为研究对象,随机双盲法将其分为两组,每组40例,120k V/100m As者为低剂量组,120k V/200m As者为常规剂量组,多层螺旋CT扫描后专业人员处理图像,比较两组图像质量及有效辐射剂量等指标。结果低剂量组图像质量:优30例,良10例;常规剂量组图像质量:优31例,良9例,两组图像质量比较差异无统计学意义(P>0.05);两组SNR、CNR比较差异无统计学意义(P>0.05);低剂量组ED(1.71±0.18)m Sv显著低于常规剂量组的(2.86±0.44)m Sv,差异有统计学意义(P<0.01)。结论低剂量前瞻性门控轴面扫描成像与常规剂量成像质量类似,但能显著减少受检者辐射剂量,值得临床推广。

Objective To compare the quality and radiation dose of multi-slice spiral CT imaging of different dose of prospective gated axial scan for cardiac coronary artery. Methods 80 patients receiving cardiac coronary artery imaging by prospective gated axial scan were selected as the research object and were divided into two groups by the randomized double blind method with 40 cases in each group. Patients with 120 k V/100 m As were included in the low dose group while with 120 k V/200 m As were included in the conventional dose group. After multi-slice spiral CT scanning, the images were processed by professionals and the image quality and effective radiation dose and other indexes were compared between the two groups. Results The image quality in the low dose group： 30 cases were excellent and 10 cases were good, image quality in the conventional dose group： 31 cases were excellent and 9 cases were good and the differences between the two groups were of no statistical significance（P〉0.05）, The differences in SNR and CNR between the two groups were of no statistical significance（P〉0.05）; ED（1.71±0.18） m Sv in the low dose group was significantly lower than（2.86±0.44） m Sv in the conventional dose group and the difference was statistically significant（P〈0.01）. Conclusion The imaging quality of low dose prospective gated imaging is similar to the conventional one, but it can significantly reduce the radiation dose to the patients, which is worthy of clinical promotion.