磁共振DWI在脑部术后早期继发急性脑梗死的应用研究

Application Value of DWI in Patients with Acute Cerebral Infarction Happened Early after Brain Surgery

目的:评价磁共振扩散加权成像(DWI)对脑部术后早期继发急性脑梗死的应用价值。方法:对764例脑部术后72 h内复查患者行常规MRI及DWI检查,评价T2WI与DWI对脑部术后早期继发急性脑梗死的诊断价值。结果:51例最后确诊为术后急性脑梗死,49例(96%)发生在邻近术区,2例(4%)发生在远离术区;DWI诊断准确度高于T2WI,比较差异有统计学意义(P<0.01);T2WI图像上,术区水肿带及脑梗死灶均表现为高信号,继发急性脑梗死DWI表现为脑内出现高信号影,而术区水肿带DWI为低信号。结论:DWI对脑部术后早期继发急性脑梗死的诊断优于T2WI,可清楚区分脑水肿与脑梗死,应作为脑部术后早期复查的常规检查序列。

Objective：To study the application value of DWI in patients with acute cerebral infarction happened early after brain surgery.Method：Conventional MRI and DWI were given to the 764 patients 72 hours after brain surgery for reexamination.The application values of T2WI and DWI in patients with acute cerebral infarction happened early after brain surgery were evaluated.Result：51 patients were finally diagnosed with postoperative acute cerebral infarction,49 cases（96%） occurred in the neighboring area of operative region, 2 cases（4%） occurred in the area far away from the operative region.The diagnostic accuracy of DWI was higher than that of T2WI,the difference was statistically significant（P〈0.01）.The areas of edema and cerebral infarction showed high signal intensity on the image of T2WI.Secondary acute cerebral infarction showed high signal intensity on the image of DWI,but the area of edema showed low signal intensity on the image of DWI.Conclusion：DWI was superior to T2WI obviously in diagnosing cerebral infarction happened early after brain surgery.It can clearly distinguish cerebral edema and cerebral infarction.It shall be used as a review sequence for the early reexamination after brain surgery.