磁敏感成像序列在脑微出血诊断中的价值

目的探讨磁敏感加权成像(SWI)在检出脑微出血灶(CMB)及隐匿性CMB(rCMB)中的价值。方法回顾性分析45例有脑CMB患者的MR影像资料,观察病灶大小、部位等特征,比较常规MR成像序列及SWI序列的检出率。检查序列包括常规MR成像序列(T1WI、T2WI、FLAIR及DWI)及SWI序列。SWI采用Ven-Bold-HR三维梯度回波序列。结果共检出197个CMB,常规MR序列检出162个,SWI检出191个,SWI的CMB检出率是常规序列的1.18倍,两者的差异有统计学意义(χ2=22.90,P<0.01)。SWI序列可以检出常规序列不能检出的隐匿性CMB(rCMB)。结论 SWI在检出CMB及rCMB中优于常规MRI序列,建议作为MRI检查的常规序列之一。

The value of susceptibility weighted imaging in the diagnosis of cerebral micro-bleeding

Abrtract Objective： To evaluate the detection ability of MR susceptibility weighted imaging（SWI） in the cerebral micro-bleedings（CMB） and recessive cerebral microbleedings（rCMB）.Materials and Methods： Magnetic resonance images of 45 cases with cerebral micro-bleeding were retrospectively analyzed.The features including size and location of the cerebral micro-bleedings were observed,and the detection rate of MRI and SWI were compared.These sequences of magnetic resonance imaging（T1WI,T2WI,FLAIR,DWI） and SWI were carried out.SWI was the VEN-BOLDHR gradient echo sequence.Results： Altogether,197 CMBs were deceted with a total of 162 CMB lesions on MRI,191 CMB lesions on SWI.The detection rate of SWI is 1.18 times of the routine sequences.There was statistic difference in showing cerebral micro-bleeding among those sequences（χ2=22.90,P0.01）.Conclusion： SWI has a higher value in the detection of CMB and rCMB than the routine sequences,and should be one of the conventional sequences.