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September 17, 2025

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

Puntos clave

Fast single-phase volumetric MR thermometry demonstrated effective temperature stability during cardiac cycles.
Temperature stability was measured at 0.9±1.4°C in systole and 0.8±0.8°C in diastole, showing consistency.
Active tracking was incorporated into an SMS EPI sequence to facilitate prospective slice tracking during measurements.
This approach may enhance the safety and accuracy of lesion formation in cardiac procedures.

Resumen

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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