Murata T, Higano S, Tamura H, Mugikura S, Takahashi S
Department of Radiology, Tohoku University School of Medicine, 1-1 Seiryou-machi Aoba-ku, Sendai, Japan.
Neuroradiology. 2002 Oct;44(10):822-4. doi: 10.1007/s00234-002-0868-x. Epub 2002 Sep 20.
Diffusion-tensor analysis allows quantitative assessment of diffusion anisotropy. Fractional anisotropy (FA) is commonly used to quantify anisotropy. One of the limitations of FA imaging is, however, that it does not contain information about the directionality of anisotropy and it is therefore difficult to identify white-matter tracts on FA images. Our purpose was to describe a simple method of making composite images containing information about both magnitude and direction of diffusion anisotropy. The composite colour-coded FA images enabled us to identify different adjacent fibre bundles of similar degrees of diffusion anisotropy, and might be helpful in assessment of these fasciculi.
扩散张量分析允许对扩散各向异性进行定量评估。分数各向异性（FA）通常用于量化各向异性。然而，FA成像的局限性之一是它不包含有关各向异性方向性的信息，因此在FA图像上很难识别白质束。我们的目的是描述一种制作包含扩散各向异性大小和方向信息的复合图像的简单方法。复合颜色编码的FA图像使我们能够识别具有相似扩散各向异性程度的不同相邻纤维束，并且可能有助于评估这些纤维束。
