Neuroimaging as a marker of the onset and progression of Alzheimer's disease

Jose C. Masdeu, Jose L. Zubieta, Javier Arbizu

Research output: Contribution to journalArticle

98 Scopus citations

Abstract

Several neuroimaging techniques are promising tools as early markers of brain pathology in Alzheimer's disease (AD). On structural MRI, atrophy of the entorhinal cortex is present already in mild cognitive impairment (MCI). In the autosomal dominant forms of AD, the rate of atrophy of medial temporal structures separates affected from control persons even 3 years before the clinical onset of cognitive impairment. The elevated annual rate of brain atrophy offers a surrogate tool for the evaluation of newer therapies using smaller samples, thereby saving time and resources. On functional MRI, activation paradigms activate a larger area of parieto-temporal association cortex in persons at higher risk for AD, whereas the entorhinal cortex activation is lesser in MCI. Similar findings have been detected with activation procedures and water (H2 15O) PET. Regional metabolism in the entorhinal cortex, studied with FDG PET, seems to predict normal elderly who will deteriorate to MCI or AD. SPECT shows decreased regional perfusion in limbic areas, both in MCI and AD, but with a lower likelihood ratio than PET. Newer PET compounds allow for the determination in AD of microglial activation, regional deposition of amyloid and the evaluation of enzymatic activity in the brain of AD patients.

Original languageEnglish (US)
Pages (from-to)55-64
Number of pages10
JournalJournal of the Neurological Sciences
Volume236
Issue number1-2
DOIs
StatePublished - Sep 15 2005

Keywords

  • Alzheimer
  • Early marker
  • fMRI
  • Functional brain imaging
  • Molecular brain imaging
  • MRI
  • Neuroimaging
  • PET
  • SPECT

ASJC Scopus subject areas

  • Aging
  • Clinical Neurology
  • Surgery
  • Developmental Neuroscience
  • Neurology
  • Neuroscience(all)

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