MRI is the best tool to evaluate neurological changes in the post-acute phase of recovery. This imaging technique provides a view of the brain's metabolic status. PET scan data is also consistent with results from neuropsychological evaluations. It has also been found that minor TBI without loss of consciousness can result in significant, functional brain damage. The EEG measures electrical activity of the brain.
Occasional findings indicate evidence of partial, complex seizures.
In recent years, the QEEG has been gaining favor in the diagnostic evaluation of MTBI by using high-speed computers to quantitatively measure brain activity. One hundred percent accuracy has been reported in QEEG's ability to differentiate between normal brain activity and MTBI, up to one year post-injury. Significant effects have been located in the frontal lobes and posterior areas of the brain. It is important to determine peripheral vs. mixed dysfunction in order to provide treatment guidelines. This reflex represents the neuronal connection between the semicircular canals in the peripheral vestibular system and the vestibular nuclei in the brainstem.