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Abstract #0679

Feasibility of fast all-systolic volumetric MR thermometry with integrated Active Tracking

Charlotte Rogers1, Nicole Stahl2, Vjeran Karloci 2, Dan Sunnarborg2, Axel Joachim Krafft3, Radhouene Neji1, Kuberan Pushparajah1, Reza Razavi1, Rene Botnar1,4,5, and Sebastien Roujol1
1King's College London, London, United Kingdom, 2Imricor Medical Systems, Burnsville, MN, United States, 3Siemens Healthineers AG, Erlangen, Germany, 4School of Engineering, Pontificia Universidad Católica de Chile, Santiago, Chile, 5Institute for Biological and Medical Engineering, Pontificia Universidad Católica de Chile, Santiago, Chile

Synopsis

Keywords: MR-Guided Interventions, Thermometry, Ablation

Motivation: Cardiac MR-thermometry is a promising approach for the guidance of cardiac ablation procedures. It acquires multiple contiguous slices per heartbeat, leading to acquisitions at different cardiac phases limiting 3D lesion assessment.

Goal(s): A novel fast single-phase volumetric CMR-thermometry sequence is presented which allows multiple slices to be acquired in the quiescent phase of systole or diastole.

Approach: Active tracking was added to an SMS EPI sequence to enable prospective slice tracking. A double inversion recovery pre-pulse is introduced for dark blood and to reduce acquisition time.

Results: In a pig model, the temperature stability was 0.9±1.4°C in systole and 0.8±0.8°C in diastole.

Impact: This study demonstrates the feasibility of fast single-phase volumetric MR thermometry with integrated Active Tracking, which may improve the safety of the procedure and the accuracy of lesion formation.

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