低场磁共振弥散成像脑梗塞诊断的应用价值

Low-field magnetic resonance diffusion-weighted imaging diagnostic value of cerebral infarction

目的：探讨低场磁共振弥散成像（DWI）序列对脑梗塞的诊断及分期的价值。方法：应用贝斯达0．35T磁共振行TIWI、T2WI、FLAIR、DWI序列对78例脑梗塞病人进行扫描，分析各序列显示的结果及信号强度特点。结果：有4例超急性期脑缺血病例中，DWI显示为高信号，而T1WI、T2WI、FLAIR信号均无明显变化，60例急性期脑梗塞，在T2WI、FLAIR、DWI上以高信号为主，在T1WI表现为稍低信号，14例陈旧性脑梗塞在DWI低信号，在T2WI、FLAIR呈高信号，T1WI为明显低信号。结论：弥散成像（DWI）脑缺血病变高度敏感，并能区分不同时期的脑梗塞，有助于临床治疗措施。

Objective To disscuss the clinical value of low magnetic field diffusion weighted imaging（DWI） in the staging of brain infarction and the differentiation from some deny elination changes. Methods 78 cases of suspected brain infarction were included in the group and received MR scan by sequences ofT1WI T2WI FLAIR and DWI with thelow field MR scanner（magnetic field of 0.35T）. Each MR sequence fingings and signal intensity features were analyzed respectively. Results High signal intensity on DWI and no signal changes on sequences of TlWI,T2WI and FLAIR were found in 4 cases with super-acute cerebral infarctiong. 60 cases with acute brain infarction showed high signal intensity on sequences of DWI, T2WI and FLAIR and slightly low signal intensity on T1WI. 14 cases of acute lacunar infarction demonstrated no signal changes on DWI, high signal intensity on T2WI and FLAIR. Conlusion on DWI in low field MR scanner is still highly sensitive to acute brain infarction and valuble in staging of brain infarction .It help make clinical treatment seletion.