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Fast MR thermometry using an echo-shifted sequence with simultaneous multi-slice imaging.

Yuhong Peng1,2,3, Chao Zou2, Yangzi Qiao2

  • 1State Key Laboratory of Ultrasound Engineering in Medicine, Chongqing Key Laboratory of Biomedical Engineering, Co-Founded by Chongqing and the Ministry of Science and Technology, College of Biomedical Engineering, Chongqing Medical University, 153 Box, 1 Yixueyuan Road, Yuzhong District, Chongqing, 400016, China.

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Summary
This summary is machine-generated.

This study introduces a new echo-shifted sequence for faster magnetic resonance imaging, improving real-time temperature monitoring during high-intensity focused ultrasound (HIFU) therapy for enhanced safety and effectiveness.

Keywords:
Echo-shifted sequenceMagnetic resonance imagingSimultaneous multi-slice imagingThermometry

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Area of Science:

  • Medical Imaging
  • Ultrasound Technology
  • Biomedical Engineering

Background:

  • Real-time monitoring is crucial for high-intensity focused ultrasound (HIFU) therapy safety and efficacy.
  • Magnetic resonance imaging (MRI) is the preferred modality for HIFU monitoring due to its temperature imaging capabilities.
  • Current MRI techniques require higher temporal resolution and larger spatial coverage for effective real-time temperature imaging.

Purpose of the Study:

  • To design a novel MRI sequence for fast temperature imaging in HIFU therapy.
  • To improve temporal resolution and spatial coverage for real-time temperature monitoring.
  • To enhance the safety and effectiveness of HIFU treatments through advanced imaging.

Main Methods:

  • Developed an echo-shifted RF-spoiled gradient echo (GRE) sequence combined with simultaneous multi-slice (SMS) imaging.
  • Evaluated sequence accuracy using phantom experiments with a fluorescent fiber thermometer.
  • Compared temperature uncertainty with traditional GRE sequences using ex vivo porcine muscle and liver tissues.

Main Results:

  • The echo-shifted sequence demonstrated superior temperature uncertainty compared to traditional GRE sequences at identical temporal resolutions.
  • The combined SMS and echo-shifted sequence successfully increased spatial coverage without compromising temporal resolution.
  • High temperature measurement precision was maintained throughout the ex vivo heating experiments.

Conclusions:

  • The developed echo-shifted sequence with SMS imaging is an effective real-time method for monitoring HIFU therapy.
  • This technique enhances the precision and coverage of temperature imaging during HIFU treatments.
  • Validated as a valuable tool for improving HIFU therapy outcomes.