目的 研究磁敏感加权成像(SWI) 对急性脑梗死并发脑微出血的诊断价值。 方法 以我院2013年1月-2015年2月收治的 70例急性脑梗死患者为研究对象，均行常 规MRI、DWI及SWI序列扫描，比较分析不 同序列扫描对脑微出血的阳性检出率。结 果 SWI检出CMB阳性38例(54.29%)，主要 分布在基底节-丘脑区、皮质-皮质下区， 脑干相对少,SWI序列上表现出圆形、点 状低信号病灶。MRI常规序列显示CMB均 为阴性，DWI显示CMB阳性6例(8.57%)。 SWI对CMB阳性检出率明显高于MRI常规 序列、DWI序列，差异有统计学意义(P ＜0.0001)。结论 SWI序列对急性脑梗死 并发脑微出血阳性检出率相比常规MRI及 DIW明显高，可作为脑微出血诊断的首选 方式。

Objective To study the diagnostic value of magnetic susceptibility weighted imaging (SWI) in acute cerebral infarction complicated by cerebral microhemorrhage. Methods 70 patients who had acute cerebral infarction and were admitted into the hospital during January 2013 to February 2015 were selected as the research objects. All of them received routine MRI, DWI and SWI sequence scanning. The positive detection rates of different sequence scanning for cerebral microhemorrhage were compared and analyzed. Results There were 38 cases (54.29%) of positive CMB detected by SWI, which mainly distributed in the basal ganglia-thalamus areas, the cortex-subcortical areas and relatively less in brain stem. There were round and punctiform low signal lesions on SWI sequence. MRI routine sequence showed that CMB was negative. There were 6 cases (8.57%) of positive CMB showed by DWI. The positive detection rate of SWI for CMB was significantly higher than that of routine MRI and DWI sequence, and the differences were statistically significant (P<0.0001). Conclusion The positive detection rate of SWI sequence for acute cerebral infarction complicated by cerebral microhemorrhage was significantly higher than of routine MRI and DIW, which can be used as the first choice for the diagnosis of cerebral microhemorrhage.