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 Sept 19994 Sept 1999

Conference

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

Bibliographical note

The Effect of Nonlinear Propagation on Heating of Tissue: A Numerical Model of Diagnostic Ultrasound Beams, M.D. Cahill, V.F. Humphrey and C. Doody, proceedings of the 15th International Symposium on Nonlinear Acoustics, Goettingen, Ed. W. Lauterborn and T. Kurtz, pp 483-486 (2000).

Keywords

  • Nonlinear Propagation of Ultrasound
  • Heating of Tissue

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