弥散张量成像技术(DTI)对视放射相关疾病的诊断价值

摘要

视放射为后视路中较易受到累及的部位,视放射病变引起的视功能改变是神经眼科的重要组成部分.常规的影像手段对视放射纤维柬的成像缺乏特异性,因此该类疾病易被漏诊和误诊.随着影像学技术的进步,在扩散加权成像(diffusion weighted imaging,DWI)基础上发展出一种新的成像方法--弥散张量成像(diffusion tenser imaging,DTI).它可以显示常规磁共振技术(MRI)所不能显示的神经纤维的细微解剖结构变化,并可通过三维重建图清晰地勾划出脑白质纤维束的走行和分布,是目前唯一无创性活体研究脑白质结构及白质束形态的检查技术.DTI技术为研究视觉通路纤维束提供了可能,也为神经眼科特别是后视路疾病提供了新的诊断依据.%Visual radiation is the part that is very easy to be damaged of the posterior visual pathway, but is hard to diagnose these kinds of diseases with normal magnetic resonance imaging. The diffusion tensor imaging ( DTI)can reflect the appearance of the posterior visual pathway and it can also show the tiny anatomic structure of the nerve fiber. DTI is the only technique to research the structure of alba with no operative incision in body. The diffusion tensor imaging provides new evidence for the disease of posterior visual pathway.