AUTO-SMASH: A self-calibrating technique for SMASH imaging

Peter M. Jakob, Mark A. Griswold, Robert R. Edelman, Daniel K. Sodickson

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Recently a new fast magnetic resonance imaging strategy, SMASH, has been described, which is based on partially parallel imaging with radiofrequency coil arrays. In this paper, an internal sensitivity calibration technique for the SMASH imaging method using self-calibration signals is described. Coil sensitivity information required for SMASH imaging is obtained during the actual scan using correlations between undersampled SMASH signal data and additionally sampled calibration signals with appropriate offsets in k- space. The advantages of this sensitivity reference method are that no extra coil array sensitivity maps have to be acquired and that it provides coil sensitivity information in areas of highly non-uniform spin-density. This auto-calibrating approach can be easily implemented with only a small sacrifice of the overall time savings afforded by SMASH imaging. The results obtained from phantom imaging experiments and from cardiac studies in nine volunteers indicate that the self-calibrating approach is an effective method to increase the potential and the flexibility of rapid imaging with SMASH.

    Original languageEnglish (US)
    Pages (from-to)42-54
    Number of pages13
    JournalMagnetic Resonance Materials in Physics, Biology and Medicine
    Volume7
    Issue number1
    DOIs
    StatePublished - Nov 1998

    Keywords

    • MR image reconstruction
    • RF coil array
    • SMASH
    • Simultaneous acquisition

    ASJC Scopus subject areas

    • Biophysics
    • Radiological and Ultrasound Technology
    • Radiology Nuclear Medicine and imaging

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