Ultrasound surgery using multiple sonications--treatment time considerations

Area of Science:

• Medical Physics
• Oncology
• Biomedical Engineering

Background:

• Noninvasive tumor ablation using focused ultrasound (FUS) relies on precise thermal dose delivery.
• Optimizing multiple sonication parameters is crucial for effective and safe tumor treatment.
• Current methods using focused transducers can lead to prolonged treatment times for large tumors.

Purpose of the Study:

• To simulate and investigate the effects of multiple sonications in noninvasive tumor surgery.
• To analyze the impact of sonication delay times and transducer movement on near-field heating.
• To compare the efficacy of phased arrays versus focused transducers in reducing treatment time.

Main Methods:

• Computer simulations of focused ultrasound tumor ablation.
• Varying delay times between consecutive pulses and transducer movement patterns.
• Investigating acoustic power, pulse duration, and sonication time effects on tissue heating.

Main Results:

• Sufficient delay time between pulses is essential to prevent normal tissue damage, dependent on acoustic power and pulse duration.
• Phased arrays can create a larger, more uniform heated tissue volume, reducing the number of required sonications.
• Phased arrays demonstrated significantly shorter treatment times compared to spherically curved transducers.

Conclusions:

• Phased array technology offers a substantial advantage in reducing treatment duration for noninvasive FUS tumor ablation.
• Optimizing sonication parameters and transducer design is key to improving the efficiency and safety of FUS treatments.
• Phased arrays represent a promising advancement for more effective noninvasive tumor surgery.