## 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.

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 language | English |
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Pages | 483-486 |

Number of pages | 4 |

Publication status | Published - 2000 |

Event | 15th International Symposium on Nonlinear Acoustics - Goettingen Duration: 1 Sep 1999 → 4 Sep 1999 |

### Conference

Conference | 15th International Symposium on Nonlinear Acoustics |
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City | Goettingen |

Period | 1/09/99 → 4/09/99 |

## Keywords

- Nonlinear Propagation of Ultrasound
- Heating of Tissue