摘要
目的 研究MRA探测颅内动脉瘤的准确性及其影响因素。方法 我们搜集 30例病人 ,其中 2 0例有近期SAH ,全部病例都行 3DTOFMRA和DSA检查。回顾性分析 3DTOFMRA和SEMRI图像 ,并与其DSA表现相比较 ,分析MRA显示动脉瘤的敏感性。结果 DSA显示了全部病例的 30个动脉瘤 ,3DTOFMRA显示 2 5个动脉瘤 ( 1个假阳性 ) ,6个动脉瘤未显示 ,1例误诊为动脉瘤。MRA显示动脉瘤的敏感性为 80 % ,假阳性为 4%。漏诊动脉瘤多位于C1 2或后交通动脉起始部 ,直径在 5mm以下。结论 3DTOFMRA是显示颅内动脉瘤的敏感方法之一 ,动脉瘤的大小和局部出血影响动脉瘤的清晰显示 。
Purpose Our goal was to determine the accuracy of MR angiography for the diagnosis of intracranial aneurysms and factors that decreased its accuracy. Methods We retrospectively studied 30 patients, among them 20 with acute subarachnoid hemorrhage. 3D TOF MRA and DSA were typically performed in 30 patients. Conventional spin echo MR images and MR angiograms were reviewed together, and the results were compared with those obtained at intraarterial DSA to determine the sensitivity of MR angiography. Results All of 30 aneurysms were identified at intraarterial DSA. 25 aneurysms(1 false) were depicted and 6 aneurysms were missed by MR angiography. Sensitivity and false positive of MR angiography for detecting intracranial aneurysms were 80% and 4% respectively. Most of missed aneurysms were located at C1 2 segment on the carotid siphon or near the beginning of the posterior communicating artery. Conclusion Three dimensional time of flight MR angiography is one of sensitive methods to identify intracranial aneurysms. Size of the aneurysm and hemorrhage near the aneurysm can affect depiction of aneurysms, and the position of intracranial aneurysms may also affect their display. [
出处
《中国医学影像技术》
CSCD
2001年第3期195-197,共3页
Chinese Journal of Medical Imaging Technology
