Unsöld R, DeGroot J, Newton T H
AJR Am J Roentgenol. 1980 Oct;135(4):767-73. doi: 10.2214/ajr.135.4.767.
The course of the intraorbital part of the optic nerve, as demonstrated on anatomic sections in various planes, is correlated with the appearance of the nerve in computed tomographic (CT) images. Discrepancies between the anatomic and CT appearance are analyzed and discussed. Since the optic nerve has a sinuous course in both the horizontal and vertical planes, no thin axial or sagittal section can be entirely parallel to the nerve. Any section will transsect the optic nerve obliquely, leading to an apparent hypodensity or "thinning" of certain segments as shown on CT. The appearance of the course of the nerve on reformatted CT images depends on the plane of the original CT section. Computed tomograms that are obtained with the eye in primary position do not allow reliable judgments regarding the course and size of the optic nerve.
在不同平面的解剖切片上所显示的视神经眶内段走行，与计算机断层扫描（CT）图像中神经的表现相关。对解剖学表现与CT表现之间的差异进行了分析和讨论。由于视神经在水平和垂直平面上均呈蜿蜒走行，因此没有薄的轴位或矢状位切片能完全与神经平行。任何切片都会斜切视神经，导致CT上显示某些节段出现明显的低密度或“变细”。重组CT图像上神经走行的表现取决于原始CT切片的平面。在眼球处于原位时获得的计算机断层扫描图像，无法对视神经的走行和大小作出可靠判断。
