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A DERATING METHOD FOR THERAPEUTIC APPLICATIONS OF HIGH INTENSITY FOCUSED ULTRASOUND.

O V Bessonova1, V A Khokhlova, M S Canney

  • 1Department of Acoustics, Physics Faculty, Moscow State University, Leninskie gory, Moscow, 119991, Russia, olga@acs366.phys.msu.ru , vera@acs366.phys.msu.ru.

Acoustical Physics
|June 29, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces a new method for estimating high intensity focused ultrasound (HIFU) fields in tissue by scaling source amplitude. This approach accurately predicts nonlinear HIFU parameters in tissue, improving therapeutic applications.

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Area of Science:

  • Acoustics
  • Medical Physics
  • Biomedical Engineering

Background:

  • Current methods for determining high intensity focused ultrasound (HIFU) fields in tissue rely on water measurements and assume linear wave propagation.
  • Neglecting nonlinear propagation effects in the derating process can lead to significant errors in therapeutic applications.

Purpose of the Study:

  • To introduce and validate a novel method for estimating nonlinear HIFU field parameters in tissue.
  • To compare numerical simulations in tissue with those in water using the proposed derating method.

Main Methods:

  • A new method based on scaling the source amplitude is introduced to estimate focal parameters of nonlinear HIFU fields.
  • Numerical solutions to a KZK-type equation were used to obtain focal acoustic field parameters in absorptive tissue.
  • Focal waveforms, peak pressures, and intensities were calculated across various source outputs and focusing gains.

Main Results:

  • The proposed derating method, based on source amplitude scaling, shows good agreement with numerical simulations in tissue for high gain sources typical in medical applications.
  • Focal field parameters derived using the new method align well with simulations.
  • Experimental validation in bovine liver tissue demonstrated the feasibility of the derating method.

Conclusions:

  • The novel source amplitude scaling method provides accurate estimations of nonlinear HIFU focal parameters in tissue.
  • This method improves the accuracy of HIFU field characterization for therapeutic medical applications.
  • The experimental results confirm the practical applicability of the developed derating technique.