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FIG 1. Diffusion-weighted images obtained from volunteers in three mutually orthogonal directions.
Top row, Direction-dependent diffusion-weighted interleaved echo-planar images of the cervical spine in a healthy male volunteer (images 1 to 3) with corresponding calculated trace-weighted diffusion and T2-weighted interleaved echo-planar images (images 4 and 5, from left to right). Diffusion gradients were applied in anteroposterior, cephalocaudal, and left-right directions (from left to right) at a b-value of 709 s/mm².
Bottom row, Calculated maps of apparent diffusion coefficient for diffusion weighting along anteroposterior, cephalocaudal, and left-right directions and trace of the diffusion tensor (from left to right).
Diffusion anisotropy can be clearly appreciated in the corpus callosum, the pontine region, and the spinal cord itself. Contrast between gray and white matter is most apparent with diffusion weighting in the left-right direction (arrows).
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