Exploring fMRI Data for Periodic Signal Components

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    Abstract

    We use a Bayesian framework to detect periodic components in fMRI data. The resulting detector is sensitive to periodic components with a flexible number of harmonics and with arbitrary amplitude and phases of the harmonics. It is possible to detect the correct number of harmonics in periodic signals even if the fundamental frequency is beyond the Nyquist frequency. We apply the signal detector to locate regions that are highly affected by periodic physiological artifacts, such as cardiac pulsation.
    Original languageEnglish
    JournalArtificial Intelligence in Medicine
    Volume25
    Issue number1
    Pages (from-to)25-44
    ISSN0933-3657
    Publication statusPublished - 2002

    Keywords

    • Periodic signals
    • Exploratory data analysis
    • Bayesian framework
    • fMRI

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