The Effect of Nonlinear Propagation on Heating of Tissue

A Numerical Model of Diagnostic Ultrasound Beams

Mark Cahill, V F Humphrey, Claire Doody

Research output: Contribution to conferencePaper

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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

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heating
propagation
linear arrays
water
scanners
safety
acoustics
estimates
temperature

Keywords

  • Nonlinear Propagation of Ultrasound
  • Heating of Tissue

Cite this

Cahill, M., Humphrey, V. F., & Doody, C. (2000). The Effect of Nonlinear Propagation on Heating of Tissue: A Numerical Model of Diagnostic Ultrasound Beams. 483-486. Paper presented at 15th International Symposium on Nonlinear Acoustics, Goettingen, .

The Effect of Nonlinear Propagation on Heating of Tissue : A Numerical Model of Diagnostic Ultrasound Beams. / Cahill, Mark; Humphrey, V F; Doody, Claire.

2000. 483-486 Paper presented at 15th International Symposium on Nonlinear Acoustics, Goettingen, .

Research output: Contribution to conferencePaper

Cahill, M, Humphrey, VF & Doody, C 2000, 'The Effect of Nonlinear Propagation on Heating of Tissue: A Numerical Model of Diagnostic Ultrasound Beams' Paper presented at 15th International Symposium on Nonlinear Acoustics, Goettingen, 1/09/99 - 4/09/99, pp. 483-486.
Cahill M, Humphrey VF, Doody C. The Effect of Nonlinear Propagation on Heating of Tissue: A Numerical Model of Diagnostic Ultrasound Beams. 2000. Paper presented at 15th International Symposium on Nonlinear Acoustics, Goettingen, .
Cahill, Mark ; Humphrey, V F ; Doody, Claire. / The Effect of Nonlinear Propagation on Heating of Tissue : A Numerical Model of Diagnostic Ultrasound Beams. Paper presented at 15th International Symposium on Nonlinear Acoustics, Goettingen, .4 p.
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abstract = "Thermal safety indices for diagnostic ultrasound beams are calculatedunder the assumption that the sound propagates under linearconditions. A non-axisymmetric finite difference model is used tosolve the KZK equation, and so to model the beam of a diagnosticscanner in pulsed Doppler mode. Beams from both a uniform focusedrectangular source and a linear array are considered. Calculations areperformed in water, and in attenuating media with tissue-likecharacteristics. Attenuating media are found to exhibit significantnonlinear effects for finite-amplitude beams. The resulting loss ofintensity by the beam is then used as the source term in a model oftissue heating to estimate the maximum temperature rises. These arecompared with the thermal indices, derived from the properties of thewater-propagated beams.",
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