Temperature feedback based heating strategy for ultrasound thermal surgery

Area of Science:

• Medical Physics
• Biomedical Engineering
• Therapeutic Ultrasound

Background:

• Phased array transducers enable multiple-focus patterns for treating large target volumes.
• Achieving uniform thermal dose typically requires precise adjustment of power levels within the target area.
• Temporal switching of power patterns is a common technique for large volume treatment.

Purpose of the Study:

• To propose and evaluate a temperature feedback-based heating strategy for phased array transducers.
• To investigate the influence of various parameters on the final thermal dose without manual power adjustment.
• To identify the key parameters for optimizing thermal dose uniformity in therapeutic ultrasound applications.

Main Methods:

• Development of a novel temperature feedback control strategy for phased array transducer heating.
• Simulations were conducted to analyze the effects of setting temperature, sonication time, power level, and blood perfusion.
• Evaluation of the proposed strategy's ability to achieve uniform thermal dose without power level adjustments.

Main Results:

• Simulation results indicate that the setting temperature is the primary determinant of the final thermal dose.
• The influence of blood perfusion on the thermal dose was found to be negligible in this model.
• Shorter sonication times are recommended, and low power levels are discouraged due to thermal conduction effects.

Conclusions:

• The proposed temperature feedback strategy effectively controls thermal dose without requiring power level adjustments.
• Setting temperature is the most critical parameter for achieving desired thermal outcomes.
• Optimizing sonication time and avoiding low power levels are important for efficient and localized thermal effects.