中场强磁共振机弥散加权成像诊断超急性期脑梗塞(附8例分析)

Diagnosis of hyper-Acute cerebral infarction intermediate field MR diffusion weight lmage:an analysis of 8 cases

目的 :评价中场强机 MRI弥散加权像 (DWI)用于诊断超急性期脑梗塞的价值。方法 :8例发病时间在 4— 6 h内的超急性期脑梗塞者接受了 DWI检查 ,分析其图像特征及病灶检出率 ,所有患者同时进行了 CT平扫与 MR常规序列检查 ,并在此后 3 d— 1周内完成复查 ,作为影像学对比。结果 :8例中通过 DWI检出发病 4— 6 h超急性期大脑中动脉梗塞 4例 ,右背侧丘脑伴同侧枕叶梗塞 1例 ,双枕顶叶深部梗塞 1例 ,脑干梗塞 1例 ,左侧小脑半球梗塞 1例 ,并通过随诊检查得以证实 ,其敏感性和特异性均为 1 0 0 %;同期 MRI常规序列检出右侧大脑中动脉梗塞 1例 ,另有 1例不能确定诊断 ;同组中 ,CT未能检出该病灶。三者间存在显著性差异。结论 :DWI在超急性期脑梗塞诊断中具有重要价值 ,是超急性期脑梗塞的首选检查方法。

Objective: To evaluate the usefulness of intermediate-field MR diffusion weight image (DWI) in the diagnosis of hyper-acute cerebral infarcts methods 8 case of hyper-acute cerebral infarction are examined with DWI within 4-6 hours. The characteristics of the images and positive rate are analiysed. CT scanning and routine MR examination were performed. Repeated examinations were done within 3 d-1w,as image comparison.Result: The 8 cases are included of hyper-acute middle cerebral artery infarction,infarction of dorsal thalamus accompanied with occipital lobe in the same side,1 case of deep part of parieto-occipital infarction,1 case of brain stem infarct and 1 case of left sphere cerebrum infarct. Both sensitivity and specificity are 100 percent. In contrast,MRI examination only found 1 case of right middle cerebral arterial infarct, and 1 uncertain case;while CT examination could not find any injury. There is significant differences among the three methods.Conclusion DWI is a valuable for the diagnosis of hyper-acute cerebral infarction and is the preferred method for the examination of hyper-acute infarction and is the preferred method for the examination of hyper-acute cerebral infarction.