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Related Experiment Videos

Magnetic resonance-guided thermal surgery

H E Cline1, J F Schenck, R D Watkins

  • 1General Electric Corporate Research and Development, Schenectady, NY 12301.

Magnetic Resonance in Medicine
|July 1, 1993
PubMed
Summary

Magnetic resonance imaging (MRI) effectively monitored heat distribution and lesion creation during focused ultrasound thermal surgery. This technology shows promise for various organ surgeries, including the prostate and brain.

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Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Thermal Ablation

Background:

  • Magnetic resonance imaging (MRI) offers non-invasive monitoring capabilities.
  • Focused ultrasound (FUS) is an emerging thermal ablation technique.
  • Real-time thermal feedback is crucial for precise FUS procedures.

Purpose of the Study:

  • To demonstrate MR-guided focused ultrasound thermal surgery.
  • To evaluate MRI's ability to monitor thermal transients and lesion formation.
  • To analyze thermal properties of tissues during FUS ablation.

Main Methods:

  • Experiments involved imaging FUS in an MRI system.
  • Heat distribution and lesion creation were monitored in gel phantoms, ex vivo bovine muscle, and in vivo rabbit muscle.

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  • Thermal profiles were measured using thermocouples and calculated from MRI data.
  • T1-weighted and T2-weighted MRI sequences were utilized for thermal and lesion imaging.

    • Main Results:

    • MRI successfully monitored heat distribution and focused ultrasound lesion creation.
    • Temperature profiles measured by thermocouples agreed with MRI-derived data and thermal models.
    • Effective thermal diffusion coefficients were determined for gel (0.0015 cm²/s) and muscle (0.0033 cm²/s).
    • Lesions were accurately detected using T2-weighted imaging, correlating with tissue sections.

    Conclusions:

    • MR-guided focused ultrasound is a viable method for thermal surgery.
    • MRI provides accurate thermal monitoring and lesion detection during FUS procedures.
    • Potential applications include surgeries in the prostate, liver, kidney, bladder, breast, eye, and brain.