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

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 <3% of the R-wave). Magneto-hydro-dynamic voltage removal provided intra-MRI ECGs that varied by <3.8% from those outside the MRI, preserving the true S-wave to T-wave segment. In premature ventricular contraction (PVC) patients, clean ECGs separated premature ventricular contraction and sinus rhythm beats. Measured heating was <1.5°C. The system reliably acquired multiphase (steady-state free precession) wall-motion-cine and phase-contrast-cine scans, including subjects in whom 4-lead gating failed. The system required a minimum repetition time of 4 ms to allow robust ECG processing. CONCLUSION: High-fidelity intra-MRI 12-lead ECG is possible.
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Submitted on : Thursday, March 8, 2018 - 11:55:41 AM
Last modification on : Monday, May 31, 2021 - 3:26:02 PM

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Zion Tsz Ho Tse, Charles Dumoulin, Gari Clifford, Jeff Schweitzer, Lei Qin, et al.. A 1.5T MRI-conditional 12-lead electrocardiogram for MRI and intra-MR intervention. Magnetic Resonance in Medicine, Wiley, 2014, 71 (3), pp.1336 - 1347. ⟨10.1002/mrm.24744⟩. ⟨hal-01726424⟩



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