Levy L M, Di Chiro G, Brooks R A, Dwyer A J, Wener L, Frank J
Neuroimaging Section, National Institute of Neurological and Communicative Disorders and Stroke, Bethesda, Md. 20892.
Radiology. 1988 Feb;166(2):479-83. doi: 10.1148/radiology.166.2.3336724.
The significance of linear regions of altered signal intensity that appear in sagittal magnetic resonance (MR) images along the length of the spinal cord was investigated. Examinations were performed on ten healthy volunteers and one patient with spinal cord edema. A 0.5-T or a 1.5-T MR system was used. Sampling-related effects (Gibbs phenomenon) at spinal cord edges and cerebrospinal fluid interfaces can lead to different signal patterns within the spinal cord and canal. These artifacts cause problems in interpretation, especially with the use of small object-to-pixel size ratios, by obscuring anatomy and simulating pathologic conditions such as pseudosyringes. Analysis of these intensity variations and of their dependence on sampling may improve the clinical accuracy of MR imaging.
研究了矢状面磁共振（MR）图像上沿脊髓长度出现的信号强度改变的线性区域的意义。对10名健康志愿者和1名患有脊髓水肿的患者进行了检查。使用了0.5-T或1.5-T的MR系统。脊髓边缘和脑脊液界面处的采样相关效应（吉布斯现象）可导致脊髓和椎管内出现不同的信号模式。这些伪影在解读时会造成问题，尤其是在使用小的物体与像素大小比时，会掩盖解剖结构并模拟诸如假性空洞等病理状况。分析这些强度变化及其对采样的依赖性可能会提高MR成像的临床准确性。
