Using both quantitative MRI and quantitative MRS, the inventor demonstrates herein that as age and dementia progress, hippocampal volume (HV), amygdala volume (AV), and NAA/mI ratio all decrease compared to normal controls. The inventors data also demonstrate herein that NAA/mI vs. total amygdala volume showed a very strong linear correlation, while NAA/mI vs. mean total hippocampal volume had a lesser but still significant correlation. Further, after analyzing the data derived from both quantitative MRI and quantitative MRS methods, the inventor made the surprising discovery that the two tests, when combined, provide significantly improved biomarkers over either alone, and are more effective at early MCI and/or AD diagnosis, as well as HS diagnosis.
