SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY
Brain fibres and eyeballs. Also shown here is a 2D axial MRI scan through the brain at the level of the eyes (lower centre). 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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