J Note

With surgical MRI units or with navigated ultrasound systems, even an intraoperative update of the imaging information is possible.

This allows for compensating the brain shift during the procedure. For many years the anterior parts of the visual system up to the lateral geniculate body could be visualized with classical imaging sequences but the optic radiation and the visual cortex could not be delineated as precisely as necessary for surgical planning.

Fig. 22.21. Visualizing the optic radiation by MR diffusion tensor imaging (DTI)-based tractography

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