低场MR FLAIR序列在脑白质疏松症诊断中的应用价值

目的：探讨低场MRI液体衰减反转恢复（fluid liquid attenuated inversion recovery,简称FLAIR） 序列在脑白质疏松症（LA）影像诊断中的应用价值。方法：采用0．3T低场MRI扫描仪对70例LA进行自旋回波（SE）序列和FLAIR序列成像，分析LA在SE及FLAIR序列中的影像表现，比较两种成像序列对LA病变的显示效果。结果：LA MRI表现为侧脑室周围和／或深部脑白质形态不规则、边缘模糊的斑点及点片状异常信号影，SE序列呈等T1或长T1、长T2信号改变，FLAIR呈略高或高信号改变；FLAIR序列成像与SE序列T2WI对LA病灶显示的满意程度及对病变的分级诊断均无明显差异。结论：在低场条件下采用FLAIR序列诊断LA，其成像效果并不比常规SE序列优越。

Value of Iow field MRI with fluid liguid attenuated inversion recovery sequence in diagnosis of leukoaraiosis

Objective:To study the value of fluid attenuated inversion recovery (FLAIR) sequence in diagnosing leu-koaraiosis (LA). Methods: With 0. 3T MR equipment, 70 cases of LA were studied with spin echo (SE) sequence and FLAIR sequence. MR appearances of LA on SE and FLAIR sequence were analyzed. The findings of LA images with those two different sequences were compared. Results: MR appearances of LA were abnormal signal intensities with irregular, illegible margin,in paraventricular region or/and deep brain white matter, which were iso-or hypointense on T1 WI and hyper-intense on T2WI,and slight hyper- or hyperintense on Flair sequence. There was no significant difference between FLAIR sequence and T2 weighted imaging of SE sequence in both demonstration and grading of LA lesions. Conclusion: With 0. 3T MR equipment,FLAIR sequence was not superior to SE sequence in diagnosing LA.