高b值扩散加权成像在脑部急性微梗死病变中的诊断价值

摘要

目的 评估高b值扩散加权成像(DWI)在急性脑梗死中的诊断价值.资料与方法 对7例急性脑梗死患者进行脑部MRI常规影像学及标准b值(b=l000 s/mm2)及高b值(b=3000 s/mm2) DWI扫描,比较信噪比(SNR)和对比噪声比(CNR),并对影像进行评价.结果 5例高b值DWI检出的微梗死灶多于低b值扫描患者,高b值组SNR及CNR显著高于低b值组,差异有统计学意义(P＜0.05);但高b值组与低b值组间表观扩散系数值差异无统计学意义(P＞0.05).结论 高b值DWI可以敏感地检出脑部急性微梗死病变,具有较高的临床应用价值.%Purpose To evaluate the diagnostic value of diffusion weighted imaging with high b value in acute cerebral microinfarcts.Materials and Methods Conventional MRI and diffusion weighted imaging with standard b value (b=1000 s/mm2) and high b value (b=3000 s/mm2) were performed in the 7 patients with acute cerebral infarction,and all the images were evaluated.The signal to noise ration (SNR) and contrast to noise ration (CNR) were measured.Results Five patients were detected much more microinfarcts in high b value as HB group than that in standard b value as SB group.The SNR and CNR were significantly higher in high b value group than that in standard b value group (P＜0.05),but the apparent diffusion coefficient value showed no significant difference between the two groups (P＞0.05).Conclusion DWI with high b value could sensitively detect acute cerebral microinfarcts with high clinical value.