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 |
|---|---|
| Pages | 483-486 |
| Number of pages | 4 |
| Publication status | Published - 2000 |
| Event | 15th International Symposium on Nonlinear Acoustics - Goettingen Duration: 1 Sept 1999 → 4 Sept 1999 |
Conference
| Conference | 15th International Symposium on Nonlinear Acoustics |
|---|---|
| City | Goettingen |
| Period | 1/09/99 → 4/09/99 |
Keywords
- Nonlinear Propagation of Ultrasound
- Heating of Tissue