Comparison of active-set method deconvolution and matched-filtering for derivation of an ultrasound transit time spectrum

Wille, M-L, Zapf, M, Ruiter, N V, Gemmeke, H, & Langton, C M (2015) Comparison of active-set method deconvolution and matched-filtering for derivation of an ultrasound transit time spectrum. Physics in Medicine and Biology, 60(12), N251-N260.

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Abstract

The quality of ultrasound computed tomography imaging is primarily determined by the accuracy of ultrasound transit time measurement. A major problem in analysis is the overlap of signals making it difficult to detect the correct transit time. The current standard is to apply a matched-filtering approach to the input and output signals. This study compares the matched-filtering technique with active set deconvolution to derive a transit time spectrum from a coded excitation chirp signal and the measured output signal. The ultrasound wave travels in a direct and a reflected path to the receiver, resulting in an overlap in the recorded output signal. The matched-filtering and deconvolution techniques were applied to determine the transit times associated with the two signal paths. Both techniques were able to detect the two different transit times; while matched-filtering has a better accuracy (0.13 μs vs. 0.18 μs standard deviation), deconvolution has a 3.5 times improved side-lobe to main-lobe ratio. A higher side-lobe suppression is important to further improve image fidelity. These results suggest that a future combination of both techniques would provide improved signal detection and hence improved image fidelity.

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ID Code: 90395
Item Type: Journal Article
Refereed: Yes
Keywords: Deconvolution, Matche-Filtering, Ultrasound, Transit Time Spectrum
DOI: 10.1088/0031-9155/60/12/N251
ISSN: 1361-6560
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000)
Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OTHER PHYSICAL SCIENCES (029900) > Physical Sciences not elsewhere classified (029999)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Schools > School of Clinical Sciences
Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2015 Institute of Physics and Engineering in Medicine
Copyright Statement: This is an author-created, un-copyedited version of an article accepted for publication in Physics in Medicine and Biology. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi: 10.1088/0031-9155/60/12/N251
Deposited On: 17 Nov 2015 04:24
Last Modified: 10 Jun 2016 10:53

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