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Nanoparticle-Mediated Histotripsy Using Dual-Frequency Pulsing Methods
Connor Edsall1, Laura Huynh2, Waleed Mustafa3
1Department of Biomedical Engineering and Mechanics, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA.
Ultrasound in Medicine & Biology
|May 26, 2024
Summary
Dual-frequency histotripsy pulsing enhances nanoparticle-mediated histotripsy (NMH) for tumor ablation. This novel method significantly increases ablation efficiency, requiring fewer pulses for complete tissue removal.
Area of Science:
- Biomedical Engineering
- Acoustic Medicine
- Nanotechnology
Background:
- Nanoparticle-mediated histotripsy (NMH) utilizes nanoparticles as cavitation nuclei for targeted, non-invasive tumor ablation.
- Focused ultrasound pulsing combined with nanoparticles offers cell-selective tumor destruction.
Purpose of the Study:
- To investigate the impact of dual-frequency histotripsy pulsing on cavitation thresholds, bubble cloud dynamics, and NMH ablative efficiency.
- To evaluate the efficacy of dual-frequency NMH using nanoparticle-enhanced cavitation nuclei.
Main Methods:
- Dual-frequency histotripsy pulsing (1:1 pressure ratio) was applied using a 500 kHz and 3 MHz transducer.
- High-speed optical imaging analyzed bubble cloud characteristics and ablation efficiency in agarose phantoms.
- Perfluorohexane-filled nanocone clusters were used as artificial cavitation nuclei.
Main Results:
- Dual-frequency pulsing generated predictable bubble clouds with reduced cavitation thresholds, comparable to single-frequency pulsing.
- Ablation efficiency significantly increased, with complete ablation achieved in <1500 pulses compared to ~4000 pulses for single-frequency NMH.
- Bubble clouds were smaller and denser, with areas closer to the higher component frequency.
Conclusions:
- Dual-frequency histotripsy pulsing demonstrates potential for enhancing NMH ablation efficacy.
- This method offers a more efficient approach to targeted, non-invasive tumor ablation.
