Abstract #5552

MRI-compatible Voltage Device Tracking (VDT) navigation: Simultaneous Tracking and imaging with high-gradient-duty-cycle sequences via complete removal of Gradient Induced Voltages. Initial results.

Mikayel Dabaghyan¹, Jose de Arcos², Raymond Kwong³, William Stevenson³, Jeff Schweitzer⁴, Greg Olson⁴, and Ehud Schmidt²

¹Mirtech, Inc, Brockton, MA, United States, ²Radiology, Brigham and Women's Hospital, Boston, MA, United States, ³Cardiology, Brigham and Women's Hospital, Boston, MA, United States, ⁴St. Jude Medical, Minnetonka, MI, United States

Voltage Device Tracking (VDT), a method for catheter navigation, during MRI is explored. VDT utilizes multiple catheter electrodes that measure both the spatial location of the electrode and the ECG on the vessel wall (EGM) at that location. Electrode spatial-localization is performed by driving intermittent sinusoidal signals at kHz frequencies between surface electrodes, and measuring the signals received by the catheter. Large (>1V) signals (GIV), generated within the body by the MR gradients during a scan interfere with the much smaller (~10mV) tracking signals. We applied two approaches to remove GIVs, which allowed VDT visualization with <5% GIV contamination.

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