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. Author manuscript; available in PMC: 2021 Jan 25.
Published in final edited form as: Neurosurg Focus. 2020 Feb 1;48(2):E6. doi: 10.3171/2019.11.FOCUS19785

FIG. 2.

FIG. 2.

A coronal view of white matter tracts reveals the problem of peritumoral edema that may foil the ability to determine underlying white matter anatomy by reducing adjacent FA values. In this image the inability to visualize a region of fibers (arrow) occurs because free water conceals the underlying tracts that may contain eloquence. Edema correction/invariance technology seeks to address this limitation of tractography in glioma surgery.