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Synchronization device for electrocardiography-gated echo-planar imaging

J Felblinger1, J F Debatin, C Boesch

  • 1Magnetic Resonance (MR) Center, University and Inselspital, Berne, Switzerland.

Radiology
|October 1, 1995
PubMed
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This study presents a novel electrocardiography (ECG) synchronization method for cardiac imaging. The technique reliably captures artifact-free ECG signals, even with rapid gradient switching during MRI scans.

Area of Science:

  • Medical Imaging
  • Cardiovascular Technology
  • Biomedical Engineering

Background:

  • Cardiac MRI requires precise timing for image acquisition.
  • High gradient slew rates in MRI can interfere with physiological signal monitoring.
  • Existing ECG synchronization methods may struggle with rapid imaging sequences.

Purpose of the Study:

  • To develop and validate an ECG synchronization technique for triggering 1.5-T echo-planar imaging (EPI) of the heart.
  • To assess the reliability of ECG signal acquisition under high gradient slew rates.
  • To ensure artifact-free ECG tracings for cardiac MRI.

Main Methods:

  • An ECG synchronization technique was implemented for 1.5-T MRI.
  • The ECG signal was amplified, filtered, and converted to an optical signal.

Related Experiment Videos

  • Optical transmission of the ECG signal was performed outside the MRI bore.
  • The technique was tested in 51 healthy volunteers during echo-planar acquisitions.

    • Main Results:

    • The developed ECG synchronization technique successfully triggered cardiac echo-planar acquisitions.
    • Reliable and artifact-free ECG tracings were obtained in all 51 volunteers.
    • The method proved effective irrespective of the gradient switching speed.

    Conclusions:

    • The novel ECG synchronization technique enables robust cardiac MRI triggering.
    • Optical ECG signal transmission effectively overcomes MRI-induced interference.
    • This method enhances the feasibility of high-temporal-resolution cardiac imaging.