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<p>Microwave ablation (MWA) of hepatic tumors benefits from MR thermometry, enabling real-time temperature monitoring to guide treatment and protect healthy tissue. However, MR thermometry in the abdomen is challenging due to respiratory and intestinal motion. This study evaluates two advanced 3D imaging sequences, Stack-of-Stars (Stars) and Stack-of-Spirals (Spirals), for precise MWA thermometry in phantom and volunteer experiments. Spirals demonstrated superior temperature precision, with a standard deviation of 1.61 ± 0.11&#xa0;°C in unheated regions, compared to 4.87 ± 0.74&#xa0;°C for Stars (single respiratory cycle). In heated regions, Spirals achieved a lower RMSE (0.6 ± 0.1&#xa0;°C vs. 1.3 ± 0.3&#xa0;°C for Stars) and a higher Dice score for ablation zone delineation (0.88 ± 0.02 vs. 0.77 ± 0.09). Spirals also produced sharper images with fewer artifacts under simulated respiratory motion, while Stars showed streaking artifacts due to higher undersampling. These findings highlight Spirals’ potential for accurate real-time thermometry in liver ablation. Future work should focus on improving reconstruction speed and mitigating susceptibility artifacts to enable clinical applications.</p>

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Evaluation study of radial and spiral based volumetric thermometry for monitoring of hepatic microwave ablation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月24日

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  • Dominik Horstmann,
  • Othmar Belker,
  • Daniel Düx,
  • Thomas Gerlach,
  • Moritz Gutt,
  • Simon Schröer,
  • Ivan Vogt,
  • Frank Wacker,
  • Bennet Hensen,
  • Marcel Gutberlet

摘要

Microwave ablation (MWA) of hepatic tumors benefits from MR thermometry, enabling real-time temperature monitoring to guide treatment and protect healthy tissue. However, MR thermometry in the abdomen is challenging due to respiratory and intestinal motion. This study evaluates two advanced 3D imaging sequences, Stack-of-Stars (Stars) and Stack-of-Spirals (Spirals), for precise MWA thermometry in phantom and volunteer experiments. Spirals demonstrated superior temperature precision, with a standard deviation of 1.61 ± 0.11 °C in unheated regions, compared to 4.87 ± 0.74 °C for Stars (single respiratory cycle). In heated regions, Spirals achieved a lower RMSE (0.6 ± 0.1 °C vs. 1.3 ± 0.3 °C for Stars) and a higher Dice score for ablation zone delineation (0.88 ± 0.02 vs. 0.77 ± 0.09). Spirals also produced sharper images with fewer artifacts under simulated respiratory motion, while Stars showed streaking artifacts due to higher undersampling. These findings highlight Spirals’ potential for accurate real-time thermometry in liver ablation. Future work should focus on improving reconstruction speed and mitigating susceptibility artifacts to enable clinical applications.