MRI在蛛网膜下腔出血诊断中的价值

Value of MRI in the Diagnosis of Subarachnoid Hemorrhage

传统观点认为，CT和腰穿是诊断蛛网膜下腔出血（SAH）的主要方法，常规MRI的T1加权成像（T1WI）和T2加权成像（T2WI）对SAH的诊断价值甚微。随着磁共振技术的发展和新型MRI序列的研究和应用，MRI在SAH诊断中的价值逐渐得到认识和肯定，并显示出其优越性。MRI对急性SAH的诊断并不逊于CT，对亚急性、慢性和不典型SAH诊断的敏感性明显优于CT，对SAH并发症的诊断优于CT，且在颅内动脉瘤的筛查和术后随访中具有一定的价值。

According to the traditional point of view, CT and lumbar puncture are the main means in the diagnosis of subarachnoid hemorrhage （SAH）. qhe values of conventional MRI T1 - weighted imaging （T1WI） and T2 weighted imaging （T2WI） are very little in the diagnosis of SAIl. With the development of MRI technique and the research and application of novel MRI sequences, the value of MRI are gradually recognized and affirmed in the diagnosis of SAH, and has shown its superiority. MRI isn＇t inferior to CT in the diagnosis of acute SAH, evidently superior to CT in the diagnosis of subacute, chronic and atypical SAHs and superior to CT in the diagnosis of the complications of SAH. MRI is valuable in screening for intracranial aneurysms and postoperative follow-up.