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Summary
This summary is machine-generated.

Centiloid (CL) quantification for amyloid PET scans shows good interchangeability between pipelines, though variations exist. Understanding these confidence intervals is crucial for accurate clinical interpretation of amyloid PET results.

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Area of Science:

  • Neuroimaging
  • Nuclear Medicine
  • Biomarker Quantification

Background:

  • Amyloid PET imaging is increasingly used for Alzheimer's disease diagnosis.
  • The Centiloid (CL) metric standardizes amyloid quantification.
  • Variability in CL values across different analysis pipelines needs systematic assessment.

Purpose of the Study:

  • To evaluate the repeatability, reproducibility, and reliability of seven Centiloid (CL) quantification pipelines.
  • To determine the confidence intervals and inter-pipeline agreement for CL values.
  • To assess the impact of pipeline variability on dichotomizing amyloid PET scans as positive or negative.

Main Methods:

  • Systematic assessment of seven CL quantification pipelines (3 regulatory, 4 research) using [18F]flutemetamol PET scans.
  • Utilized three datasets: test-retest cohort (N=10x2), amnestic MCI cohort (N=80), and BioFINDER-1 cohort (N=110).
  • Evaluated within-subject repeatability, absolute agreement for continuous CL values, and reliability for dichotomization at different thresholds.

Main Results:

  • Test-retest analysis showed biases <5 CL, with 95% repeatability coefficients of 8.1-16.1 CL.
  • Strong group-level agreement (R²≥0.93) was observed between pipelines, but 95% limits of agreement ranged from 12 to 23 CL.
  • Inter-software reliability for dichotomization was high (>92%) across wide CL ranges, but decreased near positivity thresholds.

Conclusions:

  • Centiloid values from most software pairs are largely interchangeable within test-retest variation ranges.
  • Reducing inter-pipeline limits of agreement to match test-retest levels is ideal.
  • Consideration of uncertainty estimates is essential for accurate interpretation of amyloid PET results.