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A Temporal Instability Measure for fMRI Quality Assurance.

Tim Schmidt1,2, Zoltán Nagy1

  • 1Laboratory for Social and Neural Systems Research, University of Zurich, Switzerland.

Journal of Magnetic Resonance Imaging : JMRI
|May 4, 2023
PubMed
Summary

A new temporal instability measure (TIM) offers a practical solution for assessing fMRI scanner stability. This method is reliable and widely applicable, overcoming limitations of existing quality assurance tools for fMRI experiments.

Keywords:
SVDcorrelation coefficienteigenratioinstabilityquality assurancereproducibility

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Area of Science:

  • Neuroimaging
  • Medical Physics
  • Biomedical Engineering

Background:

  • Existing fMRI quality assurance measures for scanner stability have practical or theoretical limitations.
  • A need exists for a more practical and reliable instability measure for fMRI.

Purpose of the Study:

  • To develop and validate a sensitive, reliable, and broadly applicable temporal instability measure (TIM).
  • To enhance fMRI quality assurance protocols.

Main Methods:

  • Developed a novel TIM based on the eigenratio of the correlation coefficient matrix of fMRI time-series.
  • Utilized nonparametric bootstrap resampling to estimate confidence intervals and assess TIM sensitivity.
  • Analyzed 149 fMRI datasets across different scanners and head coils (Philips, GE, Siemens).

Main Results:

  • The TIM demonstrated a wide range of values across experiments, indicating sensitivity to instability.
  • Bootstrap analysis confirmed the reliability of TIM confidence intervals.
  • Multichannel coils (32ch) generally provided more stable measurements compared to lower-channel coils (8ch).

Conclusions:

  • The proposed TIM is a valuable tool for fMRI quality assurance, particularly for multichannel coils.
  • TIM overcomes limitations of other measures, offering a reliable method to assess fMRI scanner stability.
  • This measure supports robust and reproducible fMRI data acquisition.