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Abstract #4419

Dual MRI-Tracking/SJM NavX Electro-Physiology Catheters for Navigation Inside an MRI: Initial Experience

Ehud Schmidt1, Jeremy D. Dando2, Robert D. Darrow3, Daniel Kacher1, Laurence M. Epstein4, Ferenc Jolesz1, Charles L. Dumoulin5, Vivek Y. Reddy6

1Radiology, Brigham and Womens Hospital, Boston, MA, USA; 2Atrial Fibrillation Division, St. Jude Medical, Minnetonka, MA, USA; 3GE Global Research, Niskayuna, NY, USA; 4Cardiology, Brigham and Womens Hospital, Boston, MA, USA; 5Radiology, Cincinnati Childrens Hospital, Cincinnati, OH, USA; 6Cardiology, University of Miami, Miami, FL, USA

An MRI-compatible Electro-Physiology catheter was constructed with positional tracking elements using both MRI Tracking micro-coils and St Jude NavX non-MRI, Voltage based, tracking. The catheter was tested in a Left Atrial Phantom inside an MRI. Simultaneous low-receiver bandwidth (+16 and +32 KHz) MR Tracking at 20 fps and Navx Tracking at 12 fps was possible. High Bandwidth (+128 KHz) Real-time MR Imaging disturbed the NavX tracking, but intermittent use of imaging and NavX tracking was possible, since the Navx system returned to the same position after each MRI scan.