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Test-retest reliability and sample size estimates after MRI scanner relocation.

Tracy R Melzer1, Ross J Keenan2, Gareth J Leeper3

  • 1Department of Medicine, University of Otago, Christchurch, New Zealand; New Zealand Brain Research Institute, Christchurch, New Zealand; Brain Research New Zealand - Rangahau Roro Aotearoa Centre of Research Excellence, New Zealand.

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|February 8, 2020
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Summary
This summary is machine-generated.

Scanner relocation had minimal impact on most MRI metrics, demonstrating high reliability. Cortical gray matter perfusion was the most variable metric, requiring larger sample sizes for group comparisons.

Keywords:
Diffusion MRIMRI variabilityPerfusion MRISample sizeStudy powerTest-retest reliability

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Area of Science:

  • Neuroimaging
  • Radiology
  • Biomedical Engineering

Background:

  • Reliability and reproducibility of MRI-derived metrics are crucial for clinical research.
  • Assessing the impact of scanner relocation on these metrics is essential for multi-site studies.

Purpose of the Study:

  • To evaluate the reliability and reproducibility of MRI metrics after relocating a scanner.
  • To compare within-site and between-site variability of various MRI modalities.

Main Methods:

  • Twenty healthy volunteers underwent three MRI sessions (pre-relocation, and two post-relocation).
  • Acquired T1-weighted, pseudo-continuous arterial spin labelled, and diffusion tensor imaging sequences.
  • Analyzed 12 global MRI metrics using Bayesian regression, calculating ICC and wsCV.

Main Results:

  • Most global MRI metrics showed minimal mean differences (<0.4%) and low variance (<1.4% wsCV) across relocation.
  • Cortical gray matter perfusion exhibited the highest variability (6.7% wsCV), necessitating larger sample sizes.
  • No systematic difference in variance was found between scanner locations compared to within-site reliability.

Conclusions:

  • Scanner relocation had a negligible effect on the variability of most tested MRI metrics.
  • Cortical gray matter perfusion is the most variable metric, impacting sample size calculations.
  • MRI metric reliability is maintained post-relocation, with variability comparable to within-site test-retest measures.