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Biomarkers.

Emma Ruppert1, Marina Scop Medeiros1, Marie R Vermeiren2

  • 1University of Pittsburgh, Pittsburgh, PA, USA.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 25, 2025
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Summary
This summary is machine-generated.

A new unified visual reading method for tau-PET tracers significantly improves inter-rater and inter-tracer agreement. This clinician-friendly approach harmonizes tau deposition assessments, enhancing diagnostic consistency for Alzheimer's disease.

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Area of Science:

  • Neuroimaging
  • Nuclear Medicine
  • Radiochemistry

Background:

  • Positron Emission Tomography (PET) imaging is crucial for visualizing tau pathology in the brain.
  • Integrating research findings into clinical practice, particularly through visual reads, is essential for advancing patient care.
  • Existing visual reading methods for tau PET tracers like [18F]Flortaucipir (FTP) and [18F]MK-6240 (MK) require comparison and harmonization.

Purpose of the Study:

  • To compare the performance of current visual reading methods for FTP and MK tau-PET tracers.
  • To develop and validate a unified visual reading approach for all tau-PET tracers.
  • To provide preliminary data for a standardized visual assessment of tau deposition.

Main Methods:

  • Two blinded raters evaluated FTP and MK visual reads in 340 participants from the HEAD study using established methods.
  • A novel unified visual reading method was developed and tested on 101 participants, harmonizing tracers and using adjusted Braak regions for severity staging.
  • External validation is planned across four additional cohorts using FTP, MK, PI, or RO tracers.

Main Results:

  • Previous methods showed high agreement for low/high tau burden but lower agreement for non-AD-like categories (0.55-0.69).
  • The developed unified method significantly improved inter-rater agreement (0.87-0.96) and introduced a moderate tau burden category.
  • Inter-tracer disagreement decreased from 24.7%-34.4% to 11.9%-15.8% with the new method, indicating enhanced consistency.

Conclusions:

  • Existing visual reading methods for tau-PET tracers yield variable results depending on the tracer used.
  • The proposed unified method enhances both inter-rater and inter-tracer agreement, offering a standardized approach.
  • This clinician-friendly, tracer-agnostic technique holds potential for widespread clinical adoption in tau-PET interpretation.