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Improved volumetric MR-HIFU ablation by robust binary feedback control.

Julia K Enholm¹, Max O Köhler, Bruno Quesson

¹Philips Healthcare, 01510 Vantaa, Finland. julia.enholm@philips.com

IEEE Transactions on Bio-Medical Engineering

|October 23, 2009

Summary

A new binary feedback method using magnetic resonance thermometry improves high-intensity focused ultrasound (HIFU) volumetric ablation. This approach enhances lesion size consistency and reduces energy requirements for thermal tissue ablation.

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Area of Science:

Medical Imaging
Ultrasound Technology
Biomedical Engineering

Background:

Volumetric thermal ablation using high-intensity focused ultrasound (HIFU) guided by magnetic resonance (MR) thermometry is effective for large tissue volumes.
Significant variability exists in induced temperature rise and thermal lesion size due to exposure parameters and unknown tissue properties.

Purpose of the Study:

To introduce a simple and robust feedback-control method for high-intensity focused ultrasound (HIFU) exposure during thermal ablation.
To improve the consistency and energy efficiency of volumetric thermal ablation using MR-guided HIFU.

Main Methods:

A binary feedback algorithm was developed to control HIFU exposure by adjusting ablation circle durations based on rapid MR thermometry.
The method's efficacy was evaluated through 90 in vivo ablations and comparison with simulation data.

Main Results:

Feedback control significantly improved the reproducibility of induced lesion size, reducing standard deviation by factors of 1.9 to 7.2 for various lesion diameters.
The binary feedback method demonstrated improved energy efficiency, requiring less energy to achieve the desired lesion size.

Conclusions:

Binary feedback control enhances the quality of volumetric ablation by ensuring consistent thermal lesion sizes.
This method reduces energy consumption, making MR-guided HIFU thermal ablation more efficient and reliable.