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AJNR - American Journal of Neuroradiology

Published ahead of print on April 16, 2008
doi: 10.3174/ajnr.A1064

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Diffusion Tensor MR Imaging of the Neurologically Intact Human Spinal Cord

B.M. Ellingson^a, J.L. Ulmer^b, S.N. Kurpad^c and B.D. Schmit^a

^a Department of Biomedical Engineering, Marquette University, Milwaukee, Wis
^b Department of Radiology, Medical College of Wisconsin, Milwaukee, Wis
^c Department of Neurosurgery, Medical College of Wisconsin, Milwaukee, Wis

View larger version (77K): [in this window] [in a new window]   Fig 1. FA images across the spinal cord for a representative subject.

View larger version (39K): [in this window] [in a new window]   Fig 2. Eigenvalue and anisotropy distributions for the entire spinal cord. A, Primary eigenvalue (1) histogram for control group. Bin frequency is shown as gray-scale level across the entire spinal cord (bin size = 1 x 10–5 mm2/s). Superimposed on the gray-scale histogram is the group mean and SD (solid black line and error bars). B, Secondary eigenvalue (2) histogram for control group. Bin frequency is shown as a gray-scale level across the entire spinal cord (bin size = 1 x 10–5 mm2/s). Superimposed on the gray-scale histogram is the group mean and SD (solid black line and error bars). C, Tertiary eigenvalue (3) histogram for the control group. Bin frequency is shown as a gray-scale level across the spinal cord (bin size = 1 x 10–5 mm2/s). Superimposed on the gray-scale histogram is the group mean and SD (solid black line and error bars). D, Fractional anisotropy histogram for control group. Bin frequency is shown as a gray-scale level across the spinal cord (bin size = 0.01). Superimposed on the gray-scale histogram is the group mean and SD (solid black line and error bars).

View larger version (22K): [in this window] [in a new window]   Fig 3. Primary eigenvalue, 1; secondary eigenvalue, 2; and tertiary eigenvalue, 3, across the spinal cord for WM regions (A), ventral GM (B), and CSF (C). FA across the spinal cord (D) for individual WM regions, ventral GM, and CSF. Mean values are shown as solid black lines. Error bars indicate SD across subjects.

View larger version (22K): [in this window] [in a new window]   Fig 4. Regression analysis of mean apparent diffusion coefficients from DTI studies of the human spinal cord with use of a variety of pulse sequences. Numbers represent identification numbers and are located in the accompanying table. Results of logarithmic regression are also shown. Solid circle indicates average signal intensity attenuation for this study.