Simultaneous FDG-PET/MRI detects hippocampal subfield metabolic differences in AD/MCI

Mackenzie L. Carlson, Phillip S. DiGiacomo, Audrey P. Fan, Maged Goubran, Mohammad Mehdi Khalighi, Steven Z. Chao, Minal Vasanawala, Max Wintermark, Elizabeth Mormino, Greg Zaharchuk, Michelle L. James, Michael M. Zeineh

Research output: Contribution to journalArticlepeer-review

Abstract

The medial temporal lobe is one of the most well-studied brain regions affected by Alzheimer’s disease (AD). Although the spread of neurofibrillary pathology in the hippocampus throughout the progression of AD has been thoroughly characterized and staged using histology and other imaging techniques, it has not been precisely quantified in vivo at the subfield level using simultaneous positron emission tomography (PET) and magnetic resonance imaging (MRI). Here, we investigate alterations in metabolism and volume using [18F]fluoro-deoxyglucose (FDG) and simultaneous time-of-flight (TOF) PET/MRI with hippocampal subfield analysis of AD, mild cognitive impairment (MCI), and healthy subjects. We found significant structural and metabolic changes within the hippocampus that can be sensitively assessed at the subfield level in a small cohort. While no significant differences were found between groups for whole hippocampal SUVr values (p = 0.166), we found a clear delineation in SUVr between groups in the dentate gyrus (p = 0.009). Subfield analysis may be more sensitive for detecting pathological changes using PET-MRI in AD compared to global hippocampal assessment.

Original languageEnglish (US)
Article number12064
JournalScientific reports
Volume10
Issue number1
DOIs
StatePublished - Dec 1 2020

ASJC Scopus subject areas

  • General

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