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Related Experiment Videos

ECG-synchronized cardiac MR imaging: method and evaluation.

P Lanzer, C Barta, E H Botvinick

    Radiology
    |June 1, 1985
    PubMed
    Summary
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    A new electrocardiographic (ECG) device enables safe and diagnostic magnetic resonance (MR) imaging of the heart. This ECG-gated system allows for clear visualization of cardiac anatomy during the cardiac cycle.

    Area of Science:

    • Cardiovascular Imaging
    • Medical Device Development
    • Magnetic Resonance Imaging

    Background:

    • Magnetic Resonance Imaging (MRI) offers detailed anatomical visualization but is sensitive to cardiac motion.
    • Electrocardiographic (ECG) gating synchronizes MRI acquisition with the cardiac cycle to minimize motion artifacts.
    • Developing compatible ECG devices for low-field MRI (0.35 Tesla) is crucial for improving cardiac imaging accessibility.

    Purpose of the Study:

    • To develop and evaluate an ECG sensing and gating device for a 0.35-Tesla (T) MRI imager.
    • To assess the safety and diagnostic quality of ECG-synchronized cardiac MR images.
    • To determine the feasibility of acquiring cardiac MR images at specific points in the cardiac cycle.

    Main Methods:

    • An ECG sensing and gating device comprising an isolated acquisition module, preamplifier, and monitor gating module was developed.

    Related Experiment Videos

  • Two spin-echo MR images were acquired for five cardiac sections in 30 patients.
  • Image quality was evaluated by two blinded investigators using a diagnostic scale (0-3).

    • Main Results:

    • 802 cardiac MR images were acquired in 30 patients using the developed ECG-gated system.
    • 91.4% agreement was observed in the assessment of diagnostic images, with 68.1% of images deemed diagnostic.
    • Factors like prolonged echo time and imaging at the cardiac apex affected image resolution.

    Conclusions:

    • ECG synchronization with gradient pulses at 0.35 T is safe for patients.
    • The developed device enables diagnostic resolution of cardiac MR images.
    • The system allows for patient monitoring and image acquisition at distinct phases of the cardiac cycle.