A 1.5T MRI‐conditional 12‐lead electrocardiogram for MRI and intra‐MR intervention

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Abstract
Purpose: High‐fidelity 12‐lead electrocardiogram (ECG) is important for physiological monitoring of patients during MR‐guided intervention and cardiac MRI. Issues in obtaining noncorrupted ECGs inside MRI include a superimposed magneto‐hydro‐dynamic voltage, gradient switching‐induced voltages, and radiofrequency heating. These problems increase with magnetic field. The aim of this study is to develop and clinically validate a 1.5T MRI‐conditional 12‐lead ECG system.Methods: The system was constructed with transmission lines to reduce radiofrequency induction and switching circuits to remove induced voltages. Adaptive filters, trained by 12‐lead measurements outside MRI and in two orientations inside MRI, were used to remove the magneto‐hydro‐dynamic voltage. The system was tested on 10 (one exercising) volunteers and four arrhythmia patients.Results: Switching circuits removed most imaging‐induced voltages (residual noise Magn Reson Med 71:1336–1347, 2014. © 2013 Wiley Periodicals, Inc.
Funding Information
  • National Institutes of Health (U41-RR019703, R03 EB013873-01A1, SBIR-1R43HL110427-01)
  • American Heart Association (10SDG261039)
  • Brigham and Women's Hospital: Brigham Radiology Research and Education Fund
  • Hong Kong Croucher Fellowship

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