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The peak rarefactional pressure generated by medical ultrasound systems in water and tissue: a numerical study

The peak rarefactional pressure generated by medical ultrasound systems in water and tissue: a numerical study
The peak rarefactional pressure generated by medical ultrasound systems in water and tissue: a numerical study
Current estimates of in-situ exposure are based on de-rating field measurements made in water to allow for the attenuation of tissue, using a specific attenuation coefficient of 0.3 dB cm-1 MHz-1. This process assumes that the propagation process is linear. However for medical ultrasound systems nonlinear propagation effects can be significant. In order to explore improved methods of characterising finite amplitude fields an extensive programme of modelling has been performed with the aim of investigating the relationship between finite amplitude fields in tissue and water. This utilised a finite difference solution to the KZK equation to model 35 fields using starting conditions typical of medical ultrasound arrays. In each case the field was modelled in water and then in homogeneous tissue, assuming the specific attenuation coefficient of 0.3 dB cm-1 MHz-1. This enabled the de-rated peak rarefactional acoustic pressure (pr,?) at specific locations, derived from water predictions, to be compared with the corresponding predictions for the peak rarefactional pressure pr in tissue. The results show that a nonlinear propagation parameter and measurement range can be used to give a reasonably good indication of the extent to which pr,? underestimates pr in tissue. Corresponding results for the pulse intensity integral do not demonstrate such a simple relationship. (Work supported by EPSRC under grant GR/R43747.)
1604-1607
Institute of Electronic and Electrical Engineers
Humphrey, V.F.
23c9bd0c-7870-428f-b0dd-5ff158d22590
Cooling, M.P.
caf6c2e0-c385-4f8c-bec6-7dd0473f65af
Duncan, T.M.
fbcb4fc6-dd71-42a2-bf3e-42f057091381
Duck, F.A.
a1178433-533c-4547-8710-3413f044a119
Humphrey, V.F.
23c9bd0c-7870-428f-b0dd-5ff158d22590
Cooling, M.P.
caf6c2e0-c385-4f8c-bec6-7dd0473f65af
Duncan, T.M.
fbcb4fc6-dd71-42a2-bf3e-42f057091381
Duck, F.A.
a1178433-533c-4547-8710-3413f044a119

Humphrey, V.F., Cooling, M.P., Duncan, T.M. and Duck, F.A. (2006) The peak rarefactional pressure generated by medical ultrasound systems in water and tissue: a numerical study. In Proceedings of the 2006 IEEE International Ultrasonics Symposium. Institute of Electronic and Electrical Engineers. pp. 1604-1607 .

Record type: Conference or Workshop Item (Paper)

Abstract

Current estimates of in-situ exposure are based on de-rating field measurements made in water to allow for the attenuation of tissue, using a specific attenuation coefficient of 0.3 dB cm-1 MHz-1. This process assumes that the propagation process is linear. However for medical ultrasound systems nonlinear propagation effects can be significant. In order to explore improved methods of characterising finite amplitude fields an extensive programme of modelling has been performed with the aim of investigating the relationship between finite amplitude fields in tissue and water. This utilised a finite difference solution to the KZK equation to model 35 fields using starting conditions typical of medical ultrasound arrays. In each case the field was modelled in water and then in homogeneous tissue, assuming the specific attenuation coefficient of 0.3 dB cm-1 MHz-1. This enabled the de-rated peak rarefactional acoustic pressure (pr,?) at specific locations, derived from water predictions, to be compared with the corresponding predictions for the peak rarefactional pressure pr in tissue. The results show that a nonlinear propagation parameter and measurement range can be used to give a reasonably good indication of the extent to which pr,? underestimates pr in tissue. Corresponding results for the pulse intensity integral do not demonstrate such a simple relationship. (Work supported by EPSRC under grant GR/R43747.)

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More information

Published date: 2006
Additional Information: CD-ROM
Venue - Dates: 2006 IEEE International Ultrasonics Symposium, 2006-10-03 - 2006-10-06

Identifiers

Local EPrints ID: 43405
URI: https://eprints.soton.ac.uk/id/eprint/43405
PURE UUID: 5fb0a6a2-4d4c-47a6-b7b3-f97f1e986992
ORCID for V.F. Humphrey: ORCID iD orcid.org/0000-0002-3580-5373

Catalogue record

Date deposited: 14 Feb 2007
Last modified: 14 Mar 2019 01:44

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Contributors

Author: V.F. Humphrey ORCID iD
Author: M.P. Cooling
Author: T.M. Duncan
Author: F.A. Duck

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