Self-calibrating parallel imaging with automatic coil sensitivity extraction

Charles A. McKenzie, Ernest N. Yeh, Michael A. Ohliger, Mark D. Price, Daniel K. Sodickson

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Calibration of the spatial sensitivity functions of coil arrays is a crucial element in parallel magnetic resonance imaging (PMRI). The most common approach has been to measure coil sensitivities directly using one or more low-resolution images acquired before or after accelerated data acquisition. However, since it is difficult to ensure that the patient and coil array will be in exactly the same positions during both calibration scans and accelerated imaging, this approach can introduce sensitivity miscalibration errors into PMRI reconstructions. This work shows that it is possible to extract sensitivity calibration images directly from a fully sampled central region of a variable-density k-space acquisition. These images have all the features of traditional PMRI sensitivity calibrations and therefore may be used for any PMRI reconstruction technique without modification. Because these calibration data are acquired simultaneously with the data to be reconstructed, errors due to sensitivity miscalibration are eliminated. In vivo implementations of self-calibrating parallel imaging using a flexible coil array are demonstrated in abdominal imaging and in real-time cardiac imaging studies.

    Original languageEnglish (US)
    Pages (from-to)529-538
    Number of pages10
    JournalMagnetic resonance in medicine
    Volume47
    Issue number3
    DOIs
    StatePublished - 2002

    Keywords

    • Coil arrays
    • Parallel MRI
    • SENSE
    • SMASH
    • Sensitivity calibration

    ASJC Scopus subject areas

    • Radiology Nuclear Medicine and imaging

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