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Modeling of Microbubble-Enhanced High-Intensity Focused Ultrasound.

Aswin Gnanaskandan1, Chao-Tsung Hsiao1, Georges Chahine1

  • 1Dynaflow, Inc., Jessup, Maryland, USA.

Ultrasound in Medicine & Biology
|April 16, 2019
PubMed
Summary
This summary is machine-generated.

Microbubbles enhance heat deposition in high intensity focused ultrasound (HIFU) treatments by increasing viscous damping. Optimal placement and concentration of microbubbles are crucial for effective tumor ablation with HIFU therapy.

Keywords:
Bubble dynamicsCancer treatmentHigh-intensity focused ultrasoundMicrobubblesNumerical modeling

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Area of Science:

  • Biomedical Engineering
  • Acoustic Physics
  • Medical Imaging & Treatment

Background:

  • High intensity focused ultrasound (HIFU) is a non-invasive therapeutic technique.
  • Enhancing thermal dose at the target is critical for effective ablation.
  • Microbubbles are being explored as agents to improve HIFU efficacy.

Purpose of the Study:

  • To investigate the heat enhancement effects of microbubbles in a HIFU field.
  • To model the interaction between microbubbles and HIFU for improved thermal deposition.
  • To identify mechanisms and parameters influencing microbubble-enhanced HIFU therapy.

Main Methods:

  • A 3-D coupled Eulerian-Lagrangian numerical model was developed.
  • Compressible Navier-Stokes equations modeled acoustic wave propagation.
  • Microbubble dynamics were tracked as discrete singularities.
  • Heat transfer equations calculated temperature rise over time.

Main Results:

  • Microbubbles significantly enhance heat deposition in the HIFU focal region.
  • Viscous damping of bubble oscillations is the primary mechanism for heat enhancement.
  • Bubble concentration (void fraction) impacts heating, with high fractions causing pre-focal heating.
  • Bubble cloud location and size influence temperature distribution and peak location.

Conclusions:

  • Microbubbles can effectively enhance HIFU-induced hyperthermia for tumor ablation.
  • Optimizing microbubble cloud parameters (concentration, location, size) is key for maximizing therapeutic effect.
  • Bubble shell presence can reduce heat deposition by limiting oscillations.