采用扩散张量成像定量研究及纤维束示踪成像观察正常腕关节正中神经

The Quantitative Study of Diffusion Tensor Imaging and The Observation of the Median Nerve of the Normal Wrist Joint with Fiber Bundle Tracing Imaging

目的运用MR扩散张量成像技术(diffusiontensorimaging,DTI)定量研究正常青年人腕关节正中神经的各向异性特点,并使用扩散张量示踪成像(diffusion tensor tractography,DTT)技术显示腕关节正中神经。方法选取38名健康志愿者行双侧腕关节轴位T2WI、轴位T1WI、轴位PD、DTI序列扫描。结果同性别同侧腕关节所测三层段横截面积及FA值差异具有统计学意义,同性别或不同性别两侧腕关节所测三层段横截面积及FA值差异无统计学意义。结论应用DTI及DTT技术可以定量描述腕关节正中神经的扩散特征及有效直观地重建显示正中神经纤维束,可以为诊断正中神经病变提供新的定量观察指标。

Objective To quantitatively study the anisotropic characteristics of median nerve of wrist joint in normal young people by diffusion tensor imaging and to display the median nerve of wrist by diffusion tensor tractography(DTT).Methods 38 healthy volunteers were examined by axial T2WI,T1WI and PD,DTI sequences.Results There were significant differences in cross sectional area and FA between the same sex and the same side of wrist joint.There was no significant difference in the cross sectional area and FA value of the three layers of wrist joint between the same sex and the different sex.Conclusion DTI and DTT techniques can be used to quantitatively describe the diffusion characteristics of median nerve in wrist joint and to reconstruct the median nerve fiber bundle effectively and intuitively,which can provide a new quantitative observation index for the diagnosis of median neuropathy.