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

摘要: 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, radiofrequency heating. These problems increase with magnetic field. The aim this study to develop clinically validate 1.5T MRI-conditional ECG system. Methods The system was constructed transmission lines reduce induction switching circuits remove induced voltages. Adaptive filters, trained by measurements outside two orientations MRI, were used the voltage. tested on 10 (one exercising) volunteers four arrhythmia patients. Results Switching removed most imaging-induced voltages (residual noise <3% R-wave). Magneto-hydro-dynamic voltage removal provided intra-MRI that varied <3.8% from those preserving true S-wave T-wave segment. In premature ventricular contraction (PVC) patients, clean separated sinus rhythm beats. Measured heating <1.5°C. reliably acquired multiphase (steady-state free precession) wall-motion-cine phase-contrast-cine scans, including subjects whom 4-lead gating failed. required minimum repetition time 4 ms allow robust processing. Conclusion High-fidelity possible. Magn Reson Med 71:1336–1347, 2014. © 2013 Wiley Periodicals, Inc.