Nonlinear propagation in ultrasonic fields: measurements, modelling and harmonic imaging
Nonlinear propagation in ultrasonic fields: measurements, modelling and harmonic imaging
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.
harmonics, imaging, medical ultrasound, nonlinear propagation
267-272
Humphrey, V.F.
ece34fc9-f0a8-4aa7-808f-c43d7f7cd55a
2000
Humphrey, V.F.
ece34fc9-f0a8-4aa7-808f-c43d7f7cd55a
Humphrey, V.F.
(2000)
Nonlinear propagation in ultrasonic fields: measurements, modelling and harmonic imaging.
Ultrasonics, 38 (1), .
(doi:10.1016/S0041-624X(99)00122-5).
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.
This record has no associated files available for download.
More information
Published date: 2000
Additional Information:
Invited paper
Keywords:
harmonics, imaging, medical ultrasound, nonlinear propagation
Identifiers
Local EPrints ID: 10145
URI: http://eprints.soton.ac.uk/id/eprint/10145
ISSN: 0041-624X
PURE UUID: f1b836f2-6a35-47f1-bc8f-f5ac67eeda48
Catalogue record
Date deposited: 26 May 2005
Last modified: 15 Mar 2024 04:58
Export record
Altmetrics
Contributors
Author:
V.F. Humphrey
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics