磁共振弥散张量成像的处理和可视化

本文介绍了磁共振弥散张量成像的原理及其数据的分析处理方法.在弥散张量成像中,对每一体素都构造一个张量以描述此体素内水分子的扩散,利用此张量的几何性质可对组织的细微结构进行定量分析.根据弥散张量的对称性,可将其分为三种基本类型以描述弥散椭球的几何特性,由此可求得表征弥散各向异性程度的测度.还可通过伪彩色处理等方法直观的表现弥散张量的几何性质,从而得到脑白质纤维的方向性等信息.本文还介绍了一种白质纤维束的追踪方法及其追踪结果.

Processing and Visualization for Diffusion Tensor MRI

This paper presents processing and visualization techniques for Diffusion Tensor MRI(DT-MRI).In DTI each voxel is assigned a tensor that describes local water diffusion.The geometric nature of diffusion tensors enables us to quantitatively characterize the local structure in tissues.The diffusion tensor can be decomposited based on its symmetrical properties,which in turn describe the geometry of the diffusion ellipsoid.The geometry or shape of the tensor can be visualized using a coloring scheme .In this paper we present a method to tracing the white matter pathways on a continuous coordinate system.