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A Magnetic Resonance Fingerprinting Approach for Simultaneous T 1 - and PRFS-Based 3D MR-Thermometry.

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Summary

This study demonstrates a novel 3D MRF technique for simultaneous proton resonance frequency shift (PRFS) and T1 thermometry during microwave ablation. The method offers complementary temperature data, with T1 improving robustness near susceptibility changes and PRFS providing high precision elsewhere.

Keywords:
MR thermometrymagnetic resonance fingerprintingmicrowave ablation

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Area of Science:

  • Magnetic Resonance Imaging
  • Medical Physics
  • Biomedical Engineering

Background:

  • Accurate temperature monitoring is crucial for effective and safe microwave ablation.
  • Existing MR thermometry techniques face challenges with susceptibility artifacts and precision.

Purpose of the Study:

  • To evaluate a 3D dual echo magnetic resonance fingerprinting (MRF) sequence for simultaneous proton resonance frequency shift (PRFS) and T1 thermometry.
  • To assess the sequence's performance during microwave ablation in ex vivo bovine liver.

Main Methods:

  • A 3D stack-of-spiral FLASH-MRF acquisition was used on a 3T system.
  • Simultaneous PRFS and T1 thermometry were performed, with T1 calibrated using PRFS in a stable region.
  • Fiber optic probes were used as reference measurements.

Main Results:

  • The T1-temperature slope was 4.81 ms/°C.
  • PRFS showed lower temporal standard deviation (0.5±0.2°C) compared to T1 (1.3±0.2°C) in non-heated regions.
  • T1 thermometry demonstrated improved accuracy (RMSE 2.1°C) near susceptibility artifacts compared to PRFS (RMSE 15.3°C).
  • Dice overlap for thermal dose maps was 67.13% for PRFS and 73.80% for T1.

Conclusions:

  • A single 3D MRF acquisition provides complementary temperature information for microwave ablation.
  • PRFS offers high precision in stable regions, while T1 thermometry is robust near susceptibility changes.
  • This framework enables in-session T1 calibration and improves thermal dose assessment.