Smith, PR, Harput, S, Cowell, DMJ et al. (2 more authors) (2012) Pre-distorted amplitude modulated (PDAM) chirps for transducer compensation in second and sub-harmonic imaging. In: Ultrasonics Symposium (IUS), 2012 IEEE International. Ultrasonics Symposium (IUS), 2012 IEEE International, 07-11 Oct 2012, Dresden, Germany. IEEE , 459 - 462. ISBN 978-1-4673-4561-3
Abstract
A pre-distortion by amplitude modulate (PDAM) method is evaluated for use in linear frequency modulated (LFM) coded harmonic imaging. LFM coded signals are known to boost the SNR of the low amplitude harmonics, but due to the nature of harmonic imaging, are located at inefficient regions of the transducer’s bandwidth. As a consequence, the LFM signal is subjected to transducer-induced tapering which is particularly severe at the start or end of the signal. The motivation for this work is to investigate whether compensating for this tapering effect results in improved compression of the harmonic signal. PDAM signals are designed using an inverse filter method. Hydrophone measurements show successful transducer compensation of the fundamental signal. Fundamental and second harmonic images of a tissue mimicking phantom indicate minimal improvement when compared with non pre-distorted LFM signals (N-PDAM). A discussion is provided as to why this result can be attributed to the use of a sub-optimal compression filter.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Institute of Communication & Power Networks (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 17 Dec 2014 11:39 |
Last Modified: | 19 Dec 2022 13:25 |
Published Version: | http://dx.doi.org/10.1109/ULTSYM.2012.0114 |
Status: | Published |
Publisher: | IEEE |
Identification Number: | 10.1109/ULTSYM.2012.0114 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:76005 |