Real-time Monitoring of High Intensity Focused Ultrasound (HIFU) Ablation of In Vitro Canine Livers Using Harmonic Motion Imaging for Focused Ultrasound (HMIFU)

Overview

This article discusses the real-time monitoring of high-intensity focused ultrasound (HIFU) ablation in canine liver using high frame rate ultrasound imaging. The technique employs harmonic motion imaging to visualize the decrease in acoustic radiation force-induced displacement in the ablated region.

Key Study Components

Area of Science

• Ultrasound Imaging
• Focused Ultrasound Therapy
• Real-time Monitoring Techniques

Background

• High-intensity focused ultrasound is used for thermal ablation.
• Real-time imaging is crucial for monitoring treatment effectiveness.
• Harmonic motion imaging enhances visualization of tissue displacement.
• Existing methods may interrupt treatment, leading to longer procedures.

Purpose of Study

• To demonstrate real-time imaging during liver ablation.
• To assess tissue displacement and stiffness during the procedure.
• To improve treatment duration and prevent overtreatment.

Methods Used

• Plain wave imaging for streaming displacement images.
• Amplitude modulated signals for thermal ablation.
• Radio frequency signals acquired using a confocal aligned phased array.
• Beamforming and displacement image estimation using normalized 1D cross-correlation.

Main Results

• Real-time imaging shows peak-to-peak displacement decrease during ablation.
• Stiffening of tissue is observed due to lesion formation.
• The technique allows high temporal resolution monitoring.
• Treatment duration is reduced without interrupting the procedure.

Conclusions

• HIFU ablation can be effectively monitored in real-time.
• The method enhances treatment safety and efficiency.
• Future applications may extend to other therapeutic areas.

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