磁敏感加权成像在出血性脑梗死诊断中的初步应用

目的 探讨磁敏感加权成像(SWI)诊断出血性脑梗死的临床价值.方法 20例亚急性期出血性脑梗死患者分别行常规MRI、扩散加权成像(DWI)和SWI检查,根据图像分析结果比较不同扫描序列所显示的梗死灶内出血灶数目及其阳性检出率;测量SWI序列出血最大层面出血灶面积和T2WI序列梗死灶最大层面的梗死灶面积,并行相关分析;观...

Preliminary clinical application of susceptibility weighted imaging in hemorrhagic cerebral infarction

Objective To investigate the clinical diagnostic value of susceptibility weighted imaging（SWI） in hemorrhagic cerebral infarction.Methods Twenty patients with subacute hemorrhagic cerebral infarction were examined by 3.0T magnetic resonance imaging（MRI）.Conventional MRI,diffusion weighted imaging（DWI） and SWI were performed simultaneously.The images were analysed,and the extents of infarction and hemorrhage were measured.The positive rate of hemorrhage on SWI was compared with other sequences.The largest areas of hemorrhage between SWI and T₂WI were performed with correlation analysis.In addition,the venous within the infarction and the micro-hemorrhage beyond the infarction were also analysed.Results SWI demonstrated all the hemorrhagic lesions（20 cases, 100%）.SWI showed 43 hemorrhagic lesions in 20 patients,while 25,15,12 hemorrhagic lesions were detected on T₁WI,DWI and T₂WI,respectively.The largest extent of infarction was（18.08±12.47） cm2 and the extent of hemorrhage was（5.02±6.27） cm² in 20 patients.There was strong correlation（r = 0.562,P = 0.010） between the extents of infarction and hemorrhage.SWI also showed hemorrhagic lesions outside infarction in 13 patients.Less or thinner venous branches were found in 12 patients,while more,larger or tortuous venous branches were found in 6 patients.Conclusion SWI is much better for hemorrhagic cerebral infarction than conventional MRI sequences,and can discover small hemorrhage focus out of cerebral infarction.SWI should be used as a routine examination for diagnosis of hemorrhagic cerebral infarction.