Which imaging test of the central nervous system is most helpful when examining the brain for…

➤ Is functional MRI or diffusion imaging useful for assessing cognitive decline?
Yes, both have clinical and research utility but are not routine first-line diagnostics. DTI assesses white matter microstructure and early connectivity loss. Resting-state fMRI shows network dysfunction such as default mode changes. Clinicians use them as adjuncts when structural imaging and cognitive testing leave uncertainty.