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In vitro study to simulate the intracardiac magnetohydrodynamic effect.

Waltraud B Buchenberg1, Wolfgang Mader2,3, Georg Hoppe1

  • 1Department of Radiology, University Medical Center Freiburg, Medical Physics, Freiburg, Germany.

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Summary

Magnetohydrodynamic (MHD) effects distort electrograms during MRI. An in vitro model and MR phase contrast data accurately simulated and estimated these MHD voltages, enabling signal correction for improved cardiac imaging.

Keywords:
electrophysiologyhemodynamicsin vitro model systemintracardiac electrogramsmagnetohydrodynamic effectphase contrast MRI

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Area of Science:

  • Biomedical Engineering
  • Medical Imaging Physics
  • Cardiovascular Electrophysiology

Background:

  • Blood flow generates magnetohydrodynamic (MHD) voltages, which can distort electrograms (EGMs) acquired during magnetic resonance imaging (MRI).
  • Understanding and mitigating these MHD-induced distortions is crucial for accurate interpretation of intracardiac signals in MRI environments.

Purpose of the Study:

  • To investigate the magnetohydrodynamic (MHD) effect on electrograms (EGMs) within the human heart.
  • To simulate MHD voltages in an in vitro model system within a 1.5 T MRI scanner.

Main Methods:

  • Developed an in vitro model to generate MHD signals mimicking intracardiac flow, acquired using standard clinical equipment.
  • Proposed and validated an analytical approach using MR phase contrast data to estimate MHD distortions on intracardiac EGMs.

Main Results:

  • Simulated MHD signals were comparable in magnitude to those measured by clinical electrograms of the left ventricle.
  • An analytical model accurately predicted MHD signal dependence on magnetic field strength and electrode separation.
  • MHD signals reconstructed from MR flow data showed excellent agreement with measured MHD signals.

Conclusions:

  • The developed in vitro model effectively facilitates the investigation of MHD effects on intracardiac EGMs.
  • Phase contrast MRI successfully characterized and quantified MHD distortions, enabling potential correction of these artifacts.