03/09/2026
Tau PET scans allow clinicians and researchers to visualize Alzheimer’s disease biology in the living brain. But sometimes the scans may show signals that are not caused by tau tangles alone.
New UCSF research, co-led by Gil Rabinovici, MD, and Lea Gringberg, MD, PhD, found that other biological processes — such as iron deposits and markers of neuroinflammation — can influence signals from a commonly used tau PET tracer.
By combining PET imaging with detailed postmortem brain mapping and AI-enabled analysis, the team showed how these factors may lead scans to “light up” more broadly than expected.
The findings could help clinicians interpret tau PET scans more accurately and improve how they are used for diagnosis, prognosis and Alzheimer’s clinical trials.
Tau proteins play an important role in our normal brain function, mainly by helping to stabilize neurons in the brain. But in Alzheimer’s disease, tau proteins can misfold and tangle inside neurons. These tangles spread across the brain forming toxic clumps that impair neuronal function and ultima...