Nonlinear propagation in ultrasonic fields: measurements, modelling and harmonic imaging
Humphrey, V.F. (2000) Nonlinear propagation in ultrasonic fields: measurements, modelling and harmonic imaging. Ultrasonics, 38, (1), 267-272. (doi:10.1016/S0041-624X(99)00122-5).
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Description/Abstract
In high amplitude ultrasonic fields, such as those used in medical ultrasound, nonlinear propagation can result in waveform distortion and the generation of harmonics of the initial frequency. In the nearfield of a transducer this process is complicated by diffraction effects associated with the source. The results of a programme to study the nonlinear propagation in the fields of circular, focused and rectangular transducers are described, and comparisons made with numerical predictions obtained using a finite difference solution to the Khokhlov–Zabolotskaya–Kuznetsov (or KZK) equation. These results are extended to consider nonlinear propagation in tissue-like media and the implications for ultrasonic measurements and ultrasonic heating are discussed. The narrower beamwidths and reduced side-lobe levels of the harmonic beams are illustrated and the use of harmonics to form diagnostic images with improved resolution is described.
| Item Type: | Article |
|---|---|
| Additional Information: | Invited paper |
| Related URLs: | |
| Keywords: | harmonics, imaging, medical ultrasound, nonlinear propagation |
| Subjects: | Q Science > QC Physics |
| Divisions: | University Structure - Pre August 2011 > Institute of Sound and Vibration Research > Fluid Dynamics and Acoustics |
| Item ID: | 10145 |
| Date Deposited: | 26 May 2005 |
| Last Modified: | 31 May 2011 23:14 |
| Contributors: | Humphrey, V.F. (Author) |
| Date: | 2000 |
| Additional Information: | Invited paper |
| Status: | Published |
| URI: | http://eprints.soton.ac.uk/id/eprint/10145 |
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