DR NICOLAS MENJOT, ISM / SCIENCE PHOTO LIBRARY DR NICOLAS MENJOT, ISM / SCIENCE PHOTO LIBRARY
Brain fibres. These nerve fibres ling the motor cortex to the spinal cord. 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, with the resulting image known as a tractogram.
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