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MR-guided focused ultrasound surgery
H E Cline1, J F Schenck, K Hynynen
1General Electric Corporate Research and Development, Schenectady, NY 12301.
Journal of Computer Assisted Tomography
|November 1, 1992
Summary
Magnetic resonance guided focused ultrasound surgery uses heat to destroy deep tissue. This study shows MR imaging can visualize and confirm thermal lesions in tissue during treatment.
Area of Science:
- Biomedical Engineering
- Medical Imaging
- Acoustic Surgery
Background:
- Focused ultrasound surgery (FUS) offers a minimally invasive approach for tissue ablation.
- Accurate thermal monitoring is crucial for controlling FUS procedures and ensuring efficacy.
- Magnetic resonance (MR) imaging can provide real-time temperature mapping during FUS.
Purpose of the Study:
- To investigate the thermal effects of focused ultrasound on tissue.
- To evaluate the capability of MR imaging in visualizing thermal dose and lesion formation during FUS.
- To correlate MR-observed thermal changes with irreversible tissue alterations.
Main Methods:
- Utilized a 1.5 T MR system with a 1.1 MHz focused ultrasound transducer.
- Heated gel phantoms and ex vivo bovine muscle specimens.
- Employed T1-weighted MR sequences to monitor thermal effects in real-time.
- Analyzed temperature distribution considering heat sources, thermal conductivity, heat content, and perfusion.
Main Results:
- Observed a temperature-dependent dark spot on MR images corresponding to the focal heat zone.
- Demonstrated that MR imaging can track the focal spot's movement.
- Confirmed irreversible tissue alteration and focal lesion formation above a critical thermal dose, visible on both MR images and specimen slices.
Conclusions:
- MR guided focused ultrasound surgery is a viable method for controlled deep tissue destruction.
- Real-time MR imaging effectively visualizes thermal dose and lesion development during FUS.
- This technique allows for precise monitoring and confirmation of targeted tissue ablation.