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Updated: Jun 25, 2025

An In vitro System to Gauge the Thrombolytic Efficacy of Histotripsy and a Lytic Drug

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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

This summary is machine-generated.

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.

Keywords:

Ablation Cavitation Dual-frequency Histotripsy Nanocone clusters Nanoparticle-mediated histotripsy Nanoparticles

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Published on: May 22, 2020

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.