颅内动脉瘤双源CT血管成像与常规和三维DSA结果的比较

目的 评价双源CT血管成像(DSCTA)在颅内动脉瘤诊断中的价值,并与常规和三维旋转DSA进行对照研究.方法 95例自发性蛛网膜下腔出血患者同时进行了DSCTA和DSA检查,用2种方法分别评价动脉瘤的检出率、形态、长轴及动脉瘤瘤颈/短轴(N/D)比值.动脉瘤N/D值比较采用配对t检验,长轴比较采用两相关样本的非参数检验.结果 95例患者,DSA在63例患者中检出67个动脉瘤,DSCTA在60例患者中检出64个动脉瘤,32例患者未检测到动脉瘤.DSCrA检测动脉瘤总的诊断敏感性、特异性、阳性预测值及阴性预测值分别为94.2%、100.0%、100.0%、91.4%.DSCTA对长径33 nnn动脉瘤的检出率与DSA一致,其诊断敏感性、特异性均为100%;长径＜3 mm动脉瘤的诊断敏感性和特异性分别为80.O%和100.0%.DSA与DSCTA所测动脉瘤N/D比值分别为0.46±0.14、0.51±0.18,差异无统计学意义(t=3.20,P＞0.05);长轴中位数分别为4.9、4.8 mm,差异也无统计学意义(Z=-1.309,P＞0.05).结论 DSCTA在诊断颅内动脉瘤方面与常规和三维旋转DSA相比有很高的敏感性和特异性.提高了小动脉瘤的检出率,可作为一种无创性的常规筛查方法.

Intracranial aneurysms on dual-source CT angiography:comparison with conventional and three dimensional DSA

Objective To assess the value of dual-source computed tomography angiography (DSCTA)in detecting intracranial aneurysms by comparing with conventional and three-dimensional DSA.Methods In this study,95 patients with subarachnoid hemorrhage(SAH)underwent both DSCTA and DSA examination.The detection rate,size,and ratio of the neck to the dome(N/D ratio)of the aneurysrns were evaluated.Statistical analysis was performed using a paired sample Student's t-test for the comparisons of the value of N/D and 2 Related Samples test for long axis.Results A total of 67 aneurysms in 63 patients at DSA and 64 aneurysms in 60 patients at DSCTA were detected,respectively;whereas no aneurysm was detected in 32 patients at DSA.Compared with DSA,the overall sensitivity.specificity,positive predictive value,and negative predictive value of DSCTA on a per-aneurysm basis were 94.2%,100.0%,100.0%,and 91.4%,respectively.For the aneurysms larger than 3 mm,the sensitivity and specificity of DSCTA in detecting intracranial aneurysms were equal to those of DSA:For aneurysms smaller than 3 mm,however,the sensitivity and specificity of DSCTA is 80.0% and 100.0%.The N/D ratio for DSA and DSC:TA was 0.46±0.14 and 0.51±0.18.respectively,and the median of long axis was 4.9 mm and 4.8 mm.respectively.There was no significant difierence in the N/D ratio(t=3.20;P＞0.05)and the long axis(Z=-1.309;P＞0.05)between DSA and DSCT.Condusions Compared with conventional and three-dimensional digital subtraction angiography,DSCTA has high sensitivity and specificity in the detection of intracranial aneurysms,especially for detection of snlall aneurysnm(＜3 mm).It can be used as a routine screening technique.