NODDI in Gray Matter is a Sensitive Marker of Aging and Early AD Changes

Overview

Journal Alzheimers Dement (Amst)

Date 2024 Jul 30

PMID 39077685

Authors

Xi Yu

Scott A Przybelski

Robert I Reid

Timothy G Lesnick

Sheelakumari Raghavan

Jonathan Graff-Radford

Val J Lowe

Kejal Kantarci

David S Knopman

Ronald C Petersen

Clifford R Jack Jr

Prashanthi Vemuri

Affiliations

Soon will be listed here.

Abstract

Introduction: Age-related and Alzheimer's disease (AD) dementia-related neurodegeneration impact brain health. While morphometric measures from T1-weighted scans are established biomarkers, they may be less sensitive to earlier changes. Neurite orientation dispersion and density imaging (NODDI), offering biologically meaningful interpretation of tissue microstructure, may be an advanced brain health biomarker.

Methods: We contrasted regional gray matter NODDI and morphometric evaluations concerning their correlation with (1) age, (2) clinical diagnosis stage, and (3) tau pathology as assessed by AV1451 positron emission tomography.

Results: Our study hypothesizes that NODDI measures are more sensitive to aging and early AD changes than morphometric measures. One NODDI output, free water fraction (FWF), showed higher sensitivity to age-related changes, generally better effect sizes in separating mild cognitively impaired from cognitively unimpaired participants, and stronger associations with regional tau deposition than morphometric measures.

Discussion: These findings underscore NODDI's utility in capturing early neurodegenerative changes and enhancing our understanding of aging and AD.

Highlights: Neurite orientation dispersion and density imaging can serve as an effective brain health biomarker for aging and early Alzheimer's disease (AD).Free water fraction has higher sensitivity to normal brain aging.Free water fraction has stronger associations with early AD and regional tau deposition.

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