采用160排螺旋扫描模式肺动脉成像技术的临床应用

目的:评价160排螺旋模式肺动脉成像(CTPA)的优势及临床应用价值。方法:70例临床怀疑肺动脉栓塞的受检者,行CTPA检查,按随机表分为2组,A组35例采用160排螺旋模式肺动脉成像;B组35例采用传统64排螺旋模式肺动脉成像。由2名有经验的放射科医师在同一工作站上阅读2组CTPA横断面图像,测量、记录参数包括主肺动脉CT值(CT value of pulmonary artery,PACTv)、主肺动脉CT值标准差(SD)、左心房CT值(CT value of left atrium,LACTv)、主肺动脉CT值与左心房CT值差值(PACTv-LACTv)、延迟时间(delay time,DT)、扫描时间(scan time,ST)、剂量长度乘积(dose length prod-uct,DLP)、有效辐射剂量(effective dose,ED)及对比噪声比(contrast to noise ratio,CRN),并进行统计学分析。结果:2组病例主肺动脉CTv(F=1.499,P=0.079)、主肺动脉SD(F=4.935,P=0.344)差异无统计学意义。而2组病例的左心房CT值(F=1.278,P=0.031)、主肺动脉CT值与左心房CT值差值(F=0.872,P=0.011)、延迟时间(F=1.829,P=0.001)、扫描时间(F=2.373,P=0.000)、对比噪声比(F=2.219,P=0.019)、剂量长度乘积(F=0.032,P=0.000)、有效辐射剂量(F=0.056,P=0.001)及对比剂剂量(F=1.705,P=0.000)差异均有统计学意义。结论:160排螺旋扫描模式CTPA成像的对比噪声比低于传统64排螺旋扫描模式,但160排螺旋扫描模式的扫描时间短,对比剂剂量、有效辐射剂量低,对于急、重症肺动脉栓塞患者临床应用价值更高。

The clinical application of 160 slice spiral pulmonary angiography

Objective:To evaluate the advantage and clinical value of 160 slice spiral CT pulmonary angiography.Methods:70 clinical suspect pulmonary embolism patients who need CT pulmonary angiography(CTPA) were divided into two groups randomly,(groups A,n=35) and(groups B,n=35).160 slice spiral CT pulmonary angiography was performed in groups A and traditional 64 slice spiral CT pulmonary angiography was performed in groups B.The images quality was assessed by two experienced observer.The parameters including CT value of main pulmonary trunk(PACTv)、standard deviation(SD)、CT value of left atrium(LMCTv)、The differrence CT value between main trunk of pulmonary artery and left atrium(PACTv-LMCTv)、 amount of contrast agent、 scanning time、 delay time,dose length product(DLP)and contrast noise rate(CNR) were calculated.Results:The results of Group A and Group B had showed that there were no significant differences between these two modalities(160 slice spiral CT and 64 slice spiral CT) in CT value of main pulmonary trunk(F=1.499,P=0.079),standard deviation(SD)(F=4.935,P=0.344).But there were significant differences in the CT value of left atrium(F=1.278,P=0.031),The differrence CT value between main trunk of pulmonary artery and left atrium(F=0.872,P=0.011),amount of contrast agent(F=1.705,P=0.000),dose length product(F=0.032,P=0.000),effective dose(F=0.056,P=0.001),scan time(F=2.373,P=0.000,),delay time(F=1.829,P=0.001) and CNR(F=2.219,P=0.019) noise of main pulmonary trunk.Conclusion:The CRN of 160 slice spiral CT pulmonary angiography is higher than the spiral CT of traditional 64 slice.But it scanning time is shorter,and both of the amount of contrast medium and radiation dose are lower,therefore the value of clinical application to diagnosis acute and severe pulmonary embolism is more higher.