64层螺旋CT与数字减影血管造影对颅内动脉瘤诊断的比较

目的 通过64层螺旋CT的CT血管造影(CTA)及CT数字减影血管造影(CTDSA)技术与数字减影血管造影(DSA)的比较研究,评价64层螺旋CT在颅内动脉瘤诊断中的临床应用价值。方法 26例临床怀疑颅内动脉瘤的患者实施64层CT和DSA检查,对64层CT图像进行了CTA和DSCTA两种方式的后处理。CTA后处理技术包括容积再现(VR),最大密度投影(MIP)和多平面重建(MPR),在CTA图像基础上用增强数据逐层减去平扫数据,自动去除骨与脑组织,获得CTDSA影像。比较3种技术(DSA、CTA和CTDSA)的特征。结果 26例可疑患者中,DSA和CTDSA发现31个动脉瘤,CTA发现29个动脉瘤。CTA漏掉的2个动脉瘤,直径小于3mm。结论 CTDSA是检查颅内动脉瘤的高度敏感的影像学方法,具有与DSA相当的价值。

Comparative study of 64-slice spiral CT and digital subtraction angiography in the diagnosis of intracranial aneurysms

Objective To evaluate the value of clinical application of 64-slice spiral CT in the diagnosis of intracranial aneurysms through the comparative study of the CT angiography (CTA), the digital subtraction angiography(DSA) and the CT digital subtraction angiography (CTDSA).Methods 26 patients suspected with intracranial aneurysms underwent both CT and DSA. CTA post-processing techniques included volume rendering(VR), maximum intensity projection (MIP) and multiplanar reconstruction(MPR). Based on the CTA data, after subtracting non-enhanced data, and removing bone and brain tissue section by section, CTDSA images could be generated while the vascular structure remained. The characteristics of three techniques(DSA,CTA and CTDSA )were compared.Results 31 aneurysms were detected by DSA and CTDSA and 29 aneurysms by CTA,with 2 aneurysms missing due to its diameter less than 3 mm.Conclusions CTDSA is a sensitive method for detecting intracranial aneurysms same as DSA.