DWI技术在急性脑梗塞中应用探讨

A Primary Study of DWI in Acute Cerebral Infarction

目的 弥散加权成像 (DWI)技术参数选择在急性脑梗塞诊断中应用探讨。方法 搜集 80例脑梗塞患者 ,其中超急性 11例 ,急性 2 7例 ,亚急性 42例 ,全部进行DWI扫描。结果 三期的DWI检出率均为 10 0 % ,超急性期T2检出率为 0 % ,急性期T2检出率为 5 5 % ,亚急性期T2检出率为 10 0 % ;DWI的弥散全方向比单方向对于显示梗塞灶较清楚 ;b值越高 ,弥散效果越好 ,显示梗塞灶越清楚 ;12 8× 12 8的采集矩阵比 12 8× 64的DWI像效果好 ;视野为 2 4× 18与 3 6× 18(CM )时 ,DWI的图像的几何变形程度一样。结论 DWI是诊断急性脑梗塞的好方法 ,其弥散方向、b值及采集矩阵的选择是成像的最主要因素。

Objective To explore the parameters of the diffusion weighted imaging (DWI) in the diagnosis of acute cerebral infarction. Methods DW EPI was performed in 80 patients with cerebral infarction, including 11 cases of super acute stage, 27 cases of acute stage, and 42 cases of subacute stage. Results In all the above stages, 100% of lesions were detected in DWI. But with T2WI, 0% of super acute lesions, 55% of acute lesions and 100% of subacute lesions were detected. The all direction of diffusion had showed the infarct lesions more clearly than that of singe direction of diffusion. The higher b value, the better effect of diffusion, and the more clearly infarct lesion could be showed. The effect of DWI with a matrix of 128×128 was better than that with a matrix of 128×64. The degree of geometry transformation of DWI with a field of 24×18 centimeter was the same as that with a field of 36×18 centimeter. Conclusion DWI is a good way in diagnosis of acute cerebral infarction. Direction of diffusion, b value and matrix are the most important factors of imaging.