冠状动脉CT血管成像大螺距前瞻性心电门控螺旋扫描模式下降低管电压的可行性

Feasibility of lowering low tube voltage in Flash spiral mode of coronary artery CT angiography

目的:探讨大螺距前瞻性心电门控螺旋扫描(Flash spiral)模式下降低管电压在冠状动脉CT血管成像(CCTA)中的应用价值。方法:选择2020年6月—2020年12月拟行CCTA检查的患者52例,随机分为Flash spiral组和前瞻性门控组,每组26例。对两组的图像进行客观和主观评价,并计算有效辐射剂量。结果:Flash spiral组和前瞻性门控组冠状动脉主干的图像噪声、信噪比、对比噪声比及图像主观评分比较,差异无统计学意义(P>0.05)。Flash spiral组的有效辐射剂量明显低于前瞻性门控组,差异有统计学意义(P<0.05)。结论:低管电压Flash spiral扫描可得到满足诊断要求的成像图像,同时显著降低了辐射剂量。

Objective:To investigate the application value of low tube voltage reduction in Flash spiral scanning mode in coronary artery CT angiography.Methods:All 40 patients who were scheduled to undergo CCTA examination in hospital from June 2020 to December 2020 were randomly divided into two groups:Flash spiral group(n=20)and prospectively-gatedsequence group(n=20).The images of the two groups were evaluated objectively and subjectively,and the effective radiation dose was calculated.Results:There was no significant difference in image noise,signal-to-noise ratio and contrast-to-noise ratio between Flash spiral group and prospectively-gatedsequence group,and there was no significant difference in image subjective score between the two groups(P>0.05).The effective radiation dose in the Flash spiral group was significantly lower than that in the prospectively-gatedsequence group,there was significient difference(P<0.05).Conclusion:Flash spiral scanning with low tube voltage can obtain imaging images that meet the diagnostic requirements and reduce the radiation dose at the same time.