FLAIR和DWI在急性脑梗死诊断中的应用

目的 比较液体衰减翻转恢复(FLAIR)序列和弥散加权成像(DWI)序列在急性脑梗死中的应用。方法 15例急性脑梗死患者(10例椎基底动脉系统脑梗死，5例颈内动脉系统脑梗死)接受FLAIR和DWI检查，评价病变的显示范围、边界、与周围组织的对比度、检出病灶的数目及病灶的大小。结果 FLAIR和DWI对病变的显示范围、与周围组织的对比均优于常规T2W，除小脑梗死外，发病时间＜24h的，以DWI对病变显示更佳；＞24h的，FALIR及DWI显示病灶大小无明显差异。结论 FLAIR和DWI在急性脑梗死诊断中均优于常规T2W序列，发病时间＜24h的，以DWI显示病灶最好，对靠近颅底的急性病变，FLAIR要优于DWI。

MR assessment of acute cerebral infarction with FLAIR and DWI

Objective To compare fluid-attenuated inversion-recovery (FLAIR) sequence and diffusion-weighted imaging (DWI) sequence in evaluation of acute cerebral infarction. Methods 15 cases of acute cerebral infarction were examined with FLAIR and DWI sequences on 1.5T MR scanner.The extent,boundary ,contrast and the number of the lesions on all images were evaluated.The sizes of the lesions were calculated. Results The extent,boundary and contrast on FLAIR and DWI images were superior to conventional T 2WI.The visualization of the lesions on DWI images was proved to be the best expect for cerebellar infarction. Conclusion Both FLAIR and DWI sequences are more valuable on visualization of acute cerebral infarction than conventional T 2WI sequence. DWI is the best to show the lesions, furthermore. FLAIR is more valuable on visualization of acute cerebral infarction near base of skull than DWI sequence.