Medical Physics2026-07-102 minarXiv:2607.09401expressWhen Vessel Walls Distort the PictureIn the brain's white matter, the signal travels along axons — long neuronal processes wrapped in an insulating myelin sheath. Water fills the space inside axons and outside, in the narrow gaps between fibers.Rutger H. J. FickRashid Alievich SunyaevH. Dieter Zehapparent diffusion coefficientbrain cancer detectionWater👍👎☆SimplePopularAdvanced