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Multi-Tracer Studies of Brain Oxygen and Glucose Metabolism Using a Time-of-Flight Positron Emission Tomography-Computed Tomography Scanner
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Changes in cerebral glucose metabolism with normal aging.

R Blesa1, E Mohr, R S Miletich

  • 1Hospital Clinic i Provincial, Servei de Neurologia, Universitat de Barcelona, Barcelona, SpainUniversity of Ottawa, Faculty of Medicine/Neurology, Ottawa Civic Hospital and Elisabeth Bruyere Health Center, Ottawa, Ontario, CanadaDent Neurological Institute, Millard Filmore Hospital, State University of New York at Buffalo, Buffalo, New York, USAExperimental Therapeutics Branch, NINDS, National Institutes of Health*, Bethesda, Maryland, USA.

European Journal of Neurology
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Summary

Cerebral glucose metabolism declines linearly with age, decreasing by 8% per decade. These changes are most significant in the brain

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Area of Science:

  • Neuroscience
  • Gerontology
  • Medical Imaging

Background:

  • Cerebral glucose metabolism changes during normal aging remain poorly understood.
  • Recent advancements in neuroimaging offer enhanced precision for regional measurements.

Purpose of the Study:

  • To investigate age-related alterations in cerebral glucose metabolism.
  • To establish a quantitative relationship between age and brain glucose utilization.

Main Methods:

  • Utilized high-resolution Positron Emission Tomography (PET) scanning.
  • Employed Magnetic Resonance Imaging (MRI)-based regions of interest for precise anatomical referencing.
  • Applied corrections for partial volume and atrophy effects.

Main Results:

  • Identified a significant linear decline in cerebral glucose metabolism with advancing age.
  • Quantified an average decline of 8% per decade in whole-brain glucose metabolism.
  • Observed the most pronounced metabolic changes in limbic structures.

Conclusions:

  • Advancing age is associated with a progressive decrease in cerebral glucose metabolism.
  • Age-related declines in brain metabolism, particularly in the limbic system, may contribute to memory impairment.
  • High-resolution PET and MRI provide accurate tools for studying aging brain metabolism.