Key result
Simultaneous impedance cardiography and ECG during MRI yields signals comparable to outside acquisition.
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Simultaneous acquisition of impedance cardiography and functional MRI is technically feasible and yields comparable signal quality to outside-MRI recordings.
While simultaneous acquisition of electrocardiography (ECG) data during MRI is a widely used clinical technique, the effects of the MRI environment on impedance cardiography (ICG) data have not been characterized. We collected echo planar MRI scans while simultaneously recording ECG and thoracic impedance using carbon fiber electrodes and customized amplifiers. Here, we show that the key changes in impedance (dZ/dt) and features of the ECG waveforms are not obstructed during MRI. We present a method for ensemble averaging ICG/ECG signals collected during MRI and show that it performs comparably with signals collected outside the MRI environment. These results indicate that ICG can be used during MRI to measure stroke volume, cardiac output, preejection period, and left ventricular ejection time.
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Cieslak et al. (2014) studied this question. Simultaneous acquisition of impedance cardiography (ICG) and ECG during MRI vs. Signals collected outside the MRI environment was evaluated on Key changes in impedance (dZ/dt) and features of the ECG waveforms. Simultaneous acquisition of impedance cardiography and ECG during MRI yielded signals comparable to those collected outside the MRI environment.
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