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Abstract #3820

Active Tracking-based cardiac triggering of MR thermometry for MRI-guided cardiac ablation

Ronald Mooiweer1, Rainer Schneider2, Radhouene Neji1,3, Thomas Pohl2, Tom Lloyd4, Rahul K Mukherjee1, Mark O'Neill1, Reza Razavi1, and Sébastien Roujol1

1Biomedical Engineering Department, School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom, 2Siemens Healthcare GmbH, Erlangen, Germany, 3MR Research Collaborations, Siemens Healthcare Limited, Frimley, United Kingdom, 4Imricor Medical Systems, Burnsville, MN, United States

MR thermometry can be used for MRI-guided cardiac ablations, but ECG-triggering is not always effective. We propose to use the Active Tracking (AT) functionality included in the catheter to prospectively trigger the thermometry measurements. Modules measuring the position of the AT microcoil were interleaved with a thermometry sequence, which were repeated until a trigger condition is detected. Experiments showed successful triggering in a beating heart phantom, with a temperature stability of 1.12±0.36°C. For in-vivo interventional application, respiratory motion will need to be taken into account.

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