SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY
Brain fibres and structures. Also shown here is an overlay of the brain surface, the brain ventricles (purple) and the thalamus (pink). Diffusion tensor imaging measures the direction of water diffusion, which in the brain reveals the orientation of nerve fibres. The technique is also known as tractography (tract density imaging), with the resulting image known as a tractogram.
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