弥散加权磁共振成像在急性脑梗塞中的应用

Application of Diffusion Weighted MR Imaging on Acute Cerebral Infarction

目的 分析弥散加权磁共振成像（ＤＷＩ） 在急性脑梗塞中的表现规律。方法 用单次激发平面回波弥散加权ＭＲＩ和常规ＭＲＩ技术检查了３２ 例急性脑梗塞患者，以陈旧性脑梗塞１０ 例为对照，比较其敏感性，并测量其在ＤＷＩ、Ｔ２ ＷＩ上的梗塞面积，比较其关系。结果 ＤＷＩ在全部急性期患者中均显示出梗塞灶，而Ｔ２ ＷＩ只显示了２３ 例患者且发病时间均大于６ 小时。其梗塞面积显示：在２４ 小时内ＤＷＩ大于Ｔ２ ＷＩ。结论 ＤＷＩ较常规Ｔ２ ＷＩ能更早地发现脑缺血的改变，为超早期脑梗塞的临床诊断和治疗提供依据并可动态观察疗效。

Objective To study the characteristics of acute cerebral infarotion on diffusion weighted MRI(DWI) Methods 32 patients with acute cerebral infarction were examined with single shot echoo planar diffusion weighted MR imaging and T 2 weighted MRI.The infarct areas were measured on DWI and T 2WI respectively.The sensitivity and relationship between them were studied.Results DWI was sensitive and specific to acute cerebral infarction.It can detect all acute cerebral infarction while T 2WI only show infarct lesions more than 6 hours after onset.The infarct area shown DWI was much more than that on T 2WI before 24 hours.Conclusion DWI can diagnosis acute cerebral infarction quickly,sensitively and accurately.It may play an important role for assessment of treatment of acute cerebral infarction at superacute stage. [