A novel method for MR thermometery and real-time temperature monitoring is developed. Using the change in phase for fat between first and third navigator lines of EPI, the proposed method allows estimating the change in phase for water caused by the change in base frequency at echo time of EPI. Scanning a fat bag placed beside a phantom in different slices allow image reconstruction from the calculated phase difference. The proposed method does not require separate scans for fat and water allowing an effective monitoring of in vivo SAR for ensuring the safety of experimental subjects especially in parallel-transmit systems.
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