The Effect of Nonlinear Propagation on Heating of Tissue: A Numerical Model of Diagnostic Ultrasound Beams

Mark Cahill, V F Humphrey, Claire Doody

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Abstract

Thermal safety indices for diagnostic ultrasound beams are calculated
under the assumption that the sound propagates under linear
conditions. A non-axisymmetric finite difference model is used to
solve the KZK equation, and so to model the beam of a diagnostic
scanner in pulsed Doppler mode. Beams from both a uniform focused
rectangular source and a linear array are considered. Calculations are
performed in water, and in attenuating media with tissue-like
characteristics. Attenuating media are found to exhibit significant
nonlinear effects for finite-amplitude beams. The resulting loss of
intensity by the beam is then used as the source term in a model of
tissue heating to estimate the maximum temperature rises. These are
compared with the thermal indices, derived from the properties of the
water-propagated beams.
Original languageEnglish
Pages483-486
Number of pages4
Publication statusPublished - 2000
Event15th International Symposium on Nonlinear Acoustics - Goettingen
Duration: 1 Sep 19994 Sep 1999

Conference

Conference15th International Symposium on Nonlinear Acoustics
CityGoettingen
Period1/09/994/09/99

Keywords

  • Nonlinear Propagation of Ultrasound
  • Heating of Tissue

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