低场磁共振FLAIR序列在脑梗塞中的应用

目的　评价液体衰减反转恢复 (FLAIR)序列在低场MR中对脑梗塞的应用价值。方法　 75例脑梗塞患者 ,均进行FLAIR序列和FSE T2 WI检查 ,比较两种序列对病灶的显示能力。结果　MRI共发现 30 2个脑梗塞灶。FLAIR序列显示病灶 30 0个 ,检出率为 99 34% ;FSE T2 WI显示病灶 2 4 2个 ,检出率为 80 . 13% (P <0 .0 1) ;尤其是在显示脑皮层、皮层下和脑室旁的病灶FLAIR序列比FSE更敏感、更清晰。FLAIR对急性和亚急性梗塞显示更清晰。慢性梗塞灶FLAIR表现为低信号或中央低周边高信号。结论　在低场中 ,FLAIR序列对脑皮层、皮层下和脑室旁梗塞灶的显示较常规FSE T2 WI具有更高的敏感性 ;FLAIR序列有助于鉴别急性和陈旧性脑梗塞。FLAIR序列应该成为诊断脑梗塞的常规序列。

Application of Fluid-Attenuated Inversion-Recovery(FLAIR) Sequence in Low Field MR of Cerebral Infarction

Objective: To evaluate the application of fluid-attenuated inversion-recovery (FLAIR) sequence to cerebral infarction in low field MR. Methods:75 cases with cerebral infarction were examined with MR FSE-T 2WI and FLAIR techniques.The detectable abilities of focus with FLAIR and FSE-T 2WI were compared.Results: 302 infarction foci were identified with MRI in 75 patients. FLAIR detected more foci than FSE (300 versus 242), its sensitivity was greater than FSE (99.34% versus 88.13%, P<0.01).FLAIR was better than FSE for cortical, subcortical and periventrical foci both in sensitivity and in focus conspicuity. FLAIR displayed the foci of acute and subacute cerebral infarctions more clearly.Chronic infarctions demonstrated hypointensive center with hyperintensive rim or hypointensive plaque in FLAIR images.Conclusion:FLAIR sequence was superior to conventional FSE sequences to detect cortical, subcortical and periventrical cerebral infarctions;and also helpful to differentiate the acute infartions from chronic ones.FLAIR should become a conventional sequence in the diagnosis of cerebral infarction.