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This summary is machine-generated.

A refined hippocampal region of interest (ROI) for tau positron emission tomography (PET) significantly reduces false positives and improves detection of early tau pathology, particularly in the CA1 and prosubiculum areas.

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Area of Science:

  • Neuroimaging
  • Neuropathology
  • Biomarker Discovery

Background:

  • Current tau positron emission tomography (PET) regions of interest (ROIs) for the hippocampus are imprecise.
  • Histopathology shows tau primarily affects the CA1 and prosubiculum subfields of the hippocampus.

Purpose of the Study:

  • To develop and validate a novel hippocampal ROI for tau PET that targets specific subfields.
  • To compare the diagnostic accuracy of a refined CA1 and prosubiculum ROI against the traditional whole hippocampus approach.

Main Methods:

  • Quantified tau distribution using [18F]MK6240 PET in 432 participants (aged 55+).
  • Developed two Braak staging methods: classical whole hippocampus and refined CA1/prosubiculum ROI.
  • Assessed discordant cases between staging methods via visual inspection.

Main Results:

  • The CA1/prosubiculum ROI yielded 65% fewer discordant cases (1.78%) than the whole hippocampus (5.22%).
  • Refined ROI reduced false positives from choroid plexus off-target binding.
  • Improved detection of hippocampal-sparing tau signal in CA1.

Conclusions:

  • Targeting tau quantification to CA1 and prosubiculum enhances accuracy in tau PET.
  • This refined approach minimizes false positives and increases sensitivity for early tau pathology.
  • Recommends adopting the CA1/prosubiculum ROI for improved tau PET detection.