title: Pathophysiological concepts in mild traumatic brain injury: diffusion tensor imaging related to acute perfusion CT imaging.
abstract: BACKGROUND
  A subgroup of patients with mild traumatic brain injury (TBI) experiences residual symptoms interfering with their return to work. The pathophysiological substrate of the suboptimal outcome in these patients is a source of debate.
  
  
  OBJECTIVE
  To provide greater insight into the pathophysiological mechanisms of mild TBI.
  
  
  METHODS
  Diffusion tensor imaging (DTI) was performed during follow-up of 18 patients with mild TBI and compared with healthy control subjects. DTI data of the patient group were also compared with perfusion CT imaging in the acute phase of injury.
  
  
  RESULTS
  In patients with mild TBI, a trend was observed for a decreased fractional anisotropy (FA) in widespread bilateral frontal white matter areas with increased mean diffusivity (MD) in the parieto-temporal regions, compared to healthy control subjects. Cerebral blood volume (CBV) correlated significantly with FA in several white matter tracts including the corpus callosum, the internal capsule, the inferior fronto-occipital fascicle, the corticospinal tract, the superior and the inferior longitudinal fascicle.
  
  
  CONCLUSIONS
  In mild TBI with normal conventional imaging significant associations between cerebral perfusion in the acute phase of injury and DTI analyses in the chronic phase of injury were discerned. The pathophysiological concept of these findings is being outlined.
authors.affiliation: Department of Neurology, University Medical Center Groningen, Groningen, The Netherlands. z.metting@umcg.nl
authors.forename: Zwany
authors.initials: Z
authors.lastname: Metting
authors.forename: Leonardo
authors.initials: L
authors.lastname: Cerliani
authors.forename: Lars A
authors.initials: LA
authors.lastname: Rödiger
authors.forename: Joukje
authors.initials: J
authors.lastname: van der Naalt
mesh_terms: D000328:Adult; D016880:Anisotropy; D001810:Blood Volume; D001921:Brain / Q000098:blood supply / Q000503:physiopathology; D001930:Brain Injuries / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D016022:Case-Control Studies; D056324:Diffusion Tensor Imaging; D005260:Female; D006801:Humans; D008297:Male; D010477:Perfusion; D014057:Tomography, X-Ray Computed