Rosenbloom S, Cohen W A, Marshall C, Kricheff I I
AJNR Am J Neuroradiol. 1983 May-Jun;4(3):646-9.
Metrizamide computed tomography (CT) of the spine allows evaluation of the contents and measurement of the size of intracanalicular structures. The relative size (linear and area measurements) of spinal structures can be changed by varying imaging factors or the density of intrathecal contrast material. Two phantoms, one consisting of rods embedded in a plastic cylinder and the other of a vertebral body with a central rod simulating spinal cord, were evaluated with varying imaging factors (window width and window level) and different contrast concentrations within the surround. It was found that wide window widths allowed the most consistent measurements independent of window level, that a window level midway between the CT number of rod and surround would facilitate uniform measurements independent of window width, and that the use of high concentrations of contrast material (high CT number) in the surround, in combination with a wide window width, was most effective in establishing consistent measurements.
脊髓造影计算机断层扫描（CT）可用于评估椎管内结构的内容物并测量其大小。通过改变成像参数或鞘内造影剂的密度，可以改变脊柱结构的相对大小（线性和面积测量）。使用两个模型进行评估，一个模型由嵌入塑料圆柱体中的杆组成，另一个模型是带有模拟脊髓的中心杆的椎体，通过改变成像参数（窗宽和窗位）以及周围不同的造影剂浓度进行评估。结果发现，宽窗宽可实现最一致的测量，且与窗位无关；窗位设置在杆和周围组织CT值的中间值时，可实现与窗宽无关的均匀测量；在周围使用高浓度造影剂（高CT值）并结合宽窗宽，对于建立一致的测量最为有效。
