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Related Experiment Videos

Cardiac activation mapping by MRI

F D Knollmann1, J Mäurer, H Kücherer

  • 1Strahlenklinik und Poliklinik, Virchow-Klinikum, Medizinische Fakultät, Humboldt-Universität zu Berlin, Germany.

Magma (New York, N.Y.)
|March 1, 1996
PubMed
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Cardiac MRI can noninvasively evaluate heart activation patterns using segmented turboFLASH imaging. This technique reveals earliest electrical spreading from septal or free-wall sites, aiding in understanding cardiac electrophysiology.

Area of Science:

  • Cardiovascular Imaging
  • Medical Physics
  • Electrophysiology

Background:

  • Cardiac MRI is a developing tool for assessing cardiac function.
  • Noninvasive evaluation of cardiac activation patterns is crucial for diagnosing arrhythmias and guiding therapy.
  • Existing methods for assessing cardiac activation can be invasive or limited in spatial and temporal resolution.

Purpose of the Study:

  • To establish cardiac magnetic resonance imaging (MRI) as a tool for the noninvasive evaluation of cardiac activation patterns.
  • To assess the feasibility of using cine segmented turboFLASH imaging sequences with specific modifications for evaluating electrical activity in the heart.

Main Methods:

  • Ten healthy volunteers underwent cine segmented turboFLASH MRI.
  • Sequence modifications, including bilateral spatial saturation, were applied to optimize blood-pool signal appearance.

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  • Pixelwise calculation of first-harmonic Fourier phase values was performed and displayed as color-encoded maps to visualize activation patterns.

    • Main Results:

    • Earliest phase spreading was observed originating from anterior septal or left ventricular free-wall sites, progressing towards posterior paraseptal areas.
    • Phase scatter was reduced in spatially presaturated segmented turboFLASH studies compared to unsaturated ones.
    • Phase standard deviation was higher in basal compared to apical slice positions within areas of endocardial displacement.

    Conclusions:

    • First-harmonic Fourier phase analysis of cardiac-segmented turboFLASH MRI cine studies shows promise as a noninvasive method for evaluating cardiac activation sequences.
    • This technique may offer a valuable tool for understanding the spatial and temporal dynamics of cardiac electrical activity.
    • Further research is warranted to validate these findings and explore clinical applications.