In this quantitative sodium MRI study, 24 mild traumatic brain injury (mTBI) and 9 controls were scanned at 3 T. Total sodium content (TSC) was calculated in five different subcortical regions, as well as in global grey and white matter. TSC in mTBI did not differ statistically from controls for the examined regions. Patients with findings on conventional 1H imaging (e.g. lesions, microhemorrhages) did not differ from patients without such findings in their TSC. More patients and controls are being recruited to strengthen the statistical power of these comparisons.