Diagnostic utility of hippocampal size and mean diffusivity in amnestic MCI

Neurobiol Aging. 2007 Mar;28(3):398-403. doi: 10.1016/j.neurobiolaging.2006.01.009. Epub 2006 Mar 10.

Abstract

Hippocampus atrophy is a frequent finding in mild cognitive impairment (MCI), whereas diffusion-tensor-imaging (DTI) has demonstrated its value to detect subtle brain tissue changes in several neuropsychiatric diseases including MCI. To compare the diagnostic accuracy of both methods, high resolution MRI scans for hippocampus volumetry, and co-registered DTI-scans for ROI-based mean diffusivity (MD) and fractional anisotropy (FA) were carried out in 18 patients with amnestic MCI (7 females, age 67.3+/-8.7 years, MMSE 25.2+/-2.2) and 18 controls (age 66.9+/-9.0 years, MMSE 28.7+/-1.0). Diagnostic properties of normalized hippocampus volume (HV) and DTI measures with regard to MCI status were estimated by receiver operating characteristics (ROC) analyses and logistic regression. Parameters of the left hippocampus showed superior predictive power when compared to the right. At a specificity set to 80%, left HV had low sensitivity (50%); left hippocampal MD values revealed superior sensitivity (89%), similar to left hippocampal FA (78%). The results demonstrate higher sensitivity of DTI-derived left hippocampal parameters than volume measures in detecting subtle hippocampal abnormalities related to MCI.

Publication types

  • Comparative Study

MeSH terms

  • Aged
  • Amnesia / diagnosis*
  • Amnesia / physiopathology*
  • Analysis of Variance
  • Case-Control Studies
  • Cognition Disorders / diagnosis*
  • Cognition Disorders / physiopathology*
  • Diffusion Magnetic Resonance Imaging / methods*
  • Female
  • Functional Laterality
  • Hippocampus / pathology*
  • Humans
  • Logistic Models
  • Male
  • Middle Aged
  • ROC Curve
  • Reproducibility of Results