title: Whole-brain magnetic resonance spectroscopic imaging measures are related to disability in ALS.
abstract: OBJECTIVE
  To demonstrate the sensitivity of a recently developed whole-brain magnetic resonance spectroscopic imaging (MRSI) sequence to cerebral pathology and disability in amyotrophic lateral sclerosis (ALS), and compare with measures derived from diffusion tensor imaging.
  
  
  METHODS
  Whole-brain MRSI and diffusion tensor imaging were undertaken in 13 patients and 14 age-similar healthy controls. Mean N-acetylaspartate (NAA), fractional anisotropy, and mean diffusivity were extracted from the corticospinal tract, compared between groups, and then in relation to disability in the patient group.
  
  
  RESULTS
  Significant reductions in NAA were found along the course of the corticospinal tracts on whole-brain MRSI. There were also significant changes in fractional anisotropy (decreased) and mean diffusivity (increased) in the patient group, but only NAA showed a significant relationship with disability (r = 0.65, p = 0.01).
  
  
  CONCLUSIONS
  Whole-brain MRSI has potential as a quantifiable neuroimaging marker of disability in ALS. It offers renewed hope for a neuroimaging outcome measure with the potential for harmonization across multiple sites in the context of a therapeutic trial.
authors: Centre for Functional Magnetic Resonance of the Brain, University of Oxford, UK.
authors: Charlotte J
authors: CJ
authors: Stagg
authors: Steven
authors: S
authors: Knight
authors: Kevin
authors: K
authors: Talbot
authors: Mark
authors: M
authors: Jenkinson
authors: Andrew A
authors: AA
authors: Maudsley
authors: Martin R
authors: MR
authors: Turner
mesh_terms: D000368:Aged; D000690:Amyotrophic Lateral Sclerosis / Q000473:pathology* / Q000503:physiopathology*; D016880:Anisotropy; D001224:Aspartic Acid / Q000031:analogs & derivatives / Q000378:metabolism; D001921:Brain / Q000378:metabolism*; D016022:Case-Control Studies; D003401:Creatine / Q000378:metabolism; D038524:Diffusion Magnetic Resonance Imaging / Q000379:methods; D004185:Disability Evaluation; D006233:Persons with Disabilities; D005260:Female; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D008875:Middle Aged
chemical_list: D001224:Aspartic Acid; C000179:N-acetylaspartate; D003401:Creatine