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Comparison of finite element and heated disc models of tissue heating by ultrasound

Comparison of finite element and heated disc models of tissue heating by ultrasound
Comparison of finite element and heated disc models of tissue heating by ultrasound
This paper compares different techniques used to model the heating caused by ultrasound (US) in a phantom containing a layer of bone mimic covered by agar gel. Results from finite element (FE) models are compared with those from two techniques based on the point-source solution to the bioheat transfer equation (BHTE): one in which the bone mimic is considered to be an absorbing disc of infinitesimal thickness and the other in which the region through which the US travels is considered to be a volume heat source. The FE results are also compared with experimental measurements. The results from the models differed by up to 40% compared with those from the FE model. Furthermore, for the intensity distribution considered, which corresponds to that in the focal zone of a single-element transducer, the top hat distribution predicts a temperature rise 1.8 times greater than that for a more realistic one based on measured values.
diagnostic ultrasound, tissue heating, bone, numerical modelling, pulsed doppler ultrasound, bioeffects, safety
0301-5629
1347-1355.
Doody, C.
8e5ea41a-b8f8-4ec2-a8c9-3e6b634053fd
Duck, F.A.
a1178433-533c-4547-8710-3413f044a119
Humphrey, V.F.
ece34fc9-f0a8-4aa7-808f-c43d7f7cd55a
Doody, C.
8e5ea41a-b8f8-4ec2-a8c9-3e6b634053fd
Duck, F.A.
a1178433-533c-4547-8710-3413f044a119
Humphrey, V.F.
ece34fc9-f0a8-4aa7-808f-c43d7f7cd55a

Doody, C., Duck, F.A. and Humphrey, V.F. (2000) Comparison of finite element and heated disc models of tissue heating by ultrasound. Ultrasound in Medicine & Biology, 26 (8), 1347-1355.. (doi:10.1016/S0301-5629(00)00294-5).

Record type: Article

Abstract

This paper compares different techniques used to model the heating caused by ultrasound (US) in a phantom containing a layer of bone mimic covered by agar gel. Results from finite element (FE) models are compared with those from two techniques based on the point-source solution to the bioheat transfer equation (BHTE): one in which the bone mimic is considered to be an absorbing disc of infinitesimal thickness and the other in which the region through which the US travels is considered to be a volume heat source. The FE results are also compared with experimental measurements. The results from the models differed by up to 40% compared with those from the FE model. Furthermore, for the intensity distribution considered, which corresponds to that in the focal zone of a single-element transducer, the top hat distribution predicts a temperature rise 1.8 times greater than that for a more realistic one based on measured values.

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More information

Published date: 2000
Keywords: diagnostic ultrasound, tissue heating, bone, numerical modelling, pulsed doppler ultrasound, bioeffects, safety

Identifiers

Local EPrints ID: 10147
URI: https://eprints.soton.ac.uk/id/eprint/10147
ISSN: 0301-5629
PURE UUID: b4eff2ab-9d72-4607-a2d5-3bc80dba5018

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Date deposited: 03 May 2005
Last modified: 17 Jul 2017 17:07

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