title: An MRI-based index to measure the severity of Alzheimer's disease-like structural pattern in subjects with mild cognitive impairment.
abstract: BACKGROUND
  Structural magnetic resonance imaging (MRI) is sensitive to neurodegeneration and can be used to estimate the risk of converting to Alzheimer's disease (AD) in individuals with mild cognitive impairment (MCI). Brain changes in AD and prodromal AD involve a pattern of widespread atrophy. The use of multivariate analysis algorithms could enable the development of diagnostic tools based on structural MRI data. In this study, we investigated the possibility of combining multiple MRI features in the form of a severity index.
  
  
  METHODS
  We used baseline MRI scans from two large multicentre cohorts (AddNeuroMed and ADNI). On the basis of volumetric and cortical thickness measures at baseline with AD cases and healthy control (CTL) subjects as training sets, we generated an MRI-based severity index using the method of orthogonal projection to latent structures (OPLS). The severity index tends to be close to 1 for AD patients and 0 for CTL subjects. Values above 0.5 indicate a more AD-like pattern. The index was then estimated for subjects with MCI, and the accuracy of classification was investigated.
  
  
  RESULTS
  Based on the data at follow-up, 173 subjects converted to AD, of whom 112 (64.7%) were classified as AD-like and 61 (35.3%) as CTL-like.
  
  
  CONCLUSIONS
  We found that joint evaluation of multiple brain regions provided accurate discrimination between progressive and stable MCI, with better performance than hippocampal volume alone, or a limited set of features. A major challenge is still to determine optimal cut-off points for such parameters and to compare their relative reliability.
authors.affiliation: Institute of Clinical Medicine, Unit of Neurology, University of Eastern Finland, University Hospital of Kuopio, Kuopio, Finland. gabriela.spulber@ki.se
authors.forename: G
authors.initials: G
authors.lastname: Spulber
authors.forename: A
authors.initials: A
authors.lastname: Simmons
authors.forename: J-S
authors.initials: JS
authors.lastname: Muehlboeck
authors.forename: P
authors.initials: P
authors.lastname: Mecocci
authors.forename: B
authors.initials: B
authors.lastname: Vellas
authors.forename: M
authors.initials: M
authors.lastname: Tsolaki
authors.forename: I
authors.initials: I
authors.lastname: Kłoszewska
authors.forename: H
authors.initials: H
authors.lastname: Soininen
authors.forename: C
authors.initials: C
authors.lastname: Spenger
authors.forename: S
authors.initials: S
authors.lastname: Lovestone
authors.forename: L-O
authors.initials: LO
authors.lastname: Wahlund
authors.forename: E
authors.initials: E
authors.lastname: Westman
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000465:Algorithms; D000544:Alzheimer Disease / Q000150:complications / Q000175:diagnosis* / Q000503:physiopathology; D001921:Brain / Q000473:pathology*; D060825:Cognitive Dysfunction / Q000175:diagnosis* / Q000209:etiology / Q000503:physiopathology; D018450:Disease Progression; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009483:Neuropsychological Tests; D015203:Reproducibility of Results; D012720:Severity of Illness Index