Comparing Stack-of-Stars and Stack-of-Spirals Sequences for PRFS based 3D MR Thermometry to monitor Hepatic Microwave Ablation

Motivation: Real-time temperature monitoring during hepatic microwave ablation is essential for safe treatment. Motion-robust MR sequences are required to image the liver under respiratory movement with clinically applicable setups. Goal(s): This study compares Stack-of-Stars and Stack-of-Spirals sequences for 3D-PRFS-based MR-thermometry to assess which provides better temperature stability and ablation zone delineation in a clinically suitable setup. Approach: Phantom and volunteer experiments with motion correction were conducted evaluating temperature accuracy and image quality, using metrics such as Dice score and sensitivity. Results: Stack-of-Spirals showed superior temperature stability, ablation zone delineation, and fewer artifacts, supporting its use for accurate 3D MR-thermometry in clinical liver ablation procedures. Impact: Stack-of-Spirals demonstrates potential for clinical real-time 3D thermometry, improving ablation success in moving abdominal organs through precise monitoring. This could enhance patient safety, establish new imaging standards, and open avenues for broader application in thermal therapies.