磁共振成像常规序列与磁敏感加权成像对急性脑梗死患者脑微出血的诊断价值比较

摘要

目的 比较磁共振成像(MRI)常规序列与磁敏感加权成像(SWI)对急性脑梗死(ACI)患者脑微出血的诊断价值.方法 选取2016年1月—2017年8月中山大学附属第八医院诊断的ACI患者98例,均行MRI常规序列与SWI扫描.观察MRI不同序列脑微出血影像学特点并记录脑微出血病灶检出情况.结果 T1加权像显示脑微出血为类圆形低或等信号;T2加权像显示脑微出血为环形、类圆形稍低信号;扩散加权成像显示脑微出血为不同点状低信号;SWI显示脑微出血为条状、点状、环形或类圆形低信号,边缘清晰,周围未见严重水肿,并提示磁敏感效应.T1加权像检出脑微出血病灶9个,T2加权像检出脑微出血病灶17个,扩散加权成像检出脑微出血病灶73个,SWI检出脑微出血病灶117个.SWI检出脑微出血病灶数量最多,脑微出血病灶主要累及基底核,为50个(占42.7％).结论 与MRI常规序列相比,SWI对脑微出血的诊断价值较高.%Objective To compare the diagnostic value on cerebral microbleeds in patients with acute cerebral infarction between routine MRI sequence and SWI.Methods A total of 98 patients with acute cerebral infarction were selected in the Eighth Affiliated Hospital of Sun Yat-sen University from January 2016 to August 2017,all of them received routine MRI sequence scan and SWI scan,the imaging features of cerebral microbleeds were observed,and cerebral microbleeds lesions were recorded.Results T1-weighted imaging showed quasi-circular low- or iso-signal intensity for cerebral microbleeds;T2-weighted imaging showed annular or quasi-circular slightly low-signal intensity for cerebral microbleeds;DWI showed different punctiform low-signal intensity for cerebral microbleeds;SWI showed strip shaped,punctiform,annular or quasi-circular low-signal intensity for cerebral microbleeds,with sharpen edge and magneto-sensitive effect,without severe edema around the cerebral microbleeds lesions. T1-weighted imaging found 9 cerebral microbleeds lesions,T2-weighted imaging found 17,DWI found 73,SWI found 117(the most).Of the 117 cerebral microbleeds lesions found by SWI,50 involved basal ganglia(accounting for 42.7％).Conclusion Compared with routine MRI sequence,SWI has higher diagnostic value on cerebral microbleeds in patients with acute cerebral infarction.