Brain imaging links varied with Alzheimer's biomarker levels
In cognitively unimpaired older adults, imaging of a brain region called the locus coeruleus showed relationships with broader brain measures that depended on Alzheimer's biomarkers.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
Only the signal intensity measure of the locus coeruleus was directly associated with gray matter volume. Both signal intensity and regional volume interacted with Alzheimer's biomarkers in analyses of brain structure and glucose metabolism. These results describe relationships among biological measurements; they do not establish dementia causation or predict an individual's future cognitive decline.
This abstract-based summary has no effect sizes, confidence intervals or follow-up timing to assess. Although participants came from a randomized trial, the reported analysis concerns associations and provides no intervention comparison or later dementia outcomes.
What the scans measured
Researchers used specialized magnetic resonance imaging to estimate the signal intensity and volume of the locus coeruleus. They examined these alongside whole-brain gray matter volume, glucose metabolism, amyloid scans and blood markers.
What the interactions mean
A statistical interaction means the association between measurements varies with another factor. Here, relationships involving locus coeruleus imaging and broader brain measures depended on Alzheimer's biomarker levels. This does not, by itself, establish a useful clinical prediction.
The original publication
Altered locus coeruleus links to atrophy and hypometabolism in individuals with high Alzheimer's disease biomarkers.
Foyard E, Blanchard T, Landeau B et al.
Alzheimers Dement · 2026
- PubMed ID
- 41772375
- Record checked
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