DWI在急性缺血性脑卒中的临床应用

Clinical Application of DWI to Acute Ischemic Stroke

目的：探讨MRI弥散加权成像（DWI）对急性缺血性脑卒早期诊断的价值。方法：对62例确诊为脑梗死的患者在不同时间行颅脑CT、常规MRI和DWI扫描后进行影像学（包括48h内CT和DWI）的图像特征分析及ASPECT评分。结果：发病后1小时至1周,病灶在DWI上显示均质高信号,而CT、常规MRI多未能显示;在发病后1~3周内呈混杂高信号,大约在3周后高信号消失。DWI诊断超早期脑梗死敏感性为36/39=0.92,特异性为15/23=0.62。结论：DWI对超早期脑梗死有较高的诊断价值。

Objective： To explore the value of diffusion weighted imaging （DWI） in early diagnosis of acute ischemic stroke. Methods： Sixty patients were performed with craniocerebral CT, conventional MILl and DWI at different times, imaging （including CT and DWI within 48 hours） features and ASPECT scales were analyzed. Results： The foci showed strong signal homogeneity after attacking in three days, especially in 12 hours, while CT and conventional MRI couldn＇t demonstrate the signals; it presented mixed strong signal after the attack from eight to 20 days; and the signal disappeared around three weeks. The sensitivity of DWI in the early diagnosis of acute ischemic stroke was 36/39=0.92, the specificity was 15/23=0.62. Conclusion： DWI show a higher diagnostic value for cerebral infarction at super-early stage.