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Article: Coded excitation methods for ultrasound harmonic imaging

TitleCoded excitation methods for ultrasound harmonic imaging
Authors
Issue Date2007
PublisherCanadian Acoustical Association.
Citation
Canadian Acoustics - Acoustique Canadienne, 2007, v. 35 n. 2, p. 35-46 How to Cite?
AbstractCoded excitation methods offer the potential for improving the SNR without increasing the peak transmitted power and without sacrificing resolution. Our study examines the potential application of coded waveforms, specifically FM chirps, in harmonic imaging. Such a system, in which nonlinear echoes from tissue are used to form the image, requires the extraction and compression of the second harmonic portion of the echo signal. Our objective is to obtain the second harmonic using just one transmission, thereby avoiding problems of frame rate reduction and movement artifacts associated with multiple transmission schemes. With the help of an efficient method for predicting the transient nonlinear field from a focused transducer, design issues such as waveform and bandwidth selection, as well as filters for second harmonic extraction and compression are examined. Simulations reveal the presence of axial sidelobes in the compressed echo waveform as the bandwidth of the transmitted chirp is increased. These sidelobes, resulting from the overlap of the fundamental and third harmonic bands with the second harmonic, cannot be removed using conventional Fourier filtering. Alternative filtering techniques which utilize the separation of the harmonic bands of a backscattered chirp in the joint time-frequency domain are suggested.
Persistent Identifierhttp://hdl.handle.net/10722/73521
ISSN
2015 SCImago Journal Rankings: 0.106
References

 

DC FieldValueLanguage
dc.contributor.authorArshadi, Ren_HK
dc.contributor.authorYu, ACHen_HK
dc.contributor.authorCobbold, RSCen_HK
dc.date.accessioned2010-09-06T06:52:08Z-
dc.date.available2010-09-06T06:52:08Z-
dc.date.issued2007en_HK
dc.identifier.citationCanadian Acoustics - Acoustique Canadienne, 2007, v. 35 n. 2, p. 35-46en_HK
dc.identifier.issn0711-6659en_HK
dc.identifier.urihttp://hdl.handle.net/10722/73521-
dc.description.abstractCoded excitation methods offer the potential for improving the SNR without increasing the peak transmitted power and without sacrificing resolution. Our study examines the potential application of coded waveforms, specifically FM chirps, in harmonic imaging. Such a system, in which nonlinear echoes from tissue are used to form the image, requires the extraction and compression of the second harmonic portion of the echo signal. Our objective is to obtain the second harmonic using just one transmission, thereby avoiding problems of frame rate reduction and movement artifacts associated with multiple transmission schemes. With the help of an efficient method for predicting the transient nonlinear field from a focused transducer, design issues such as waveform and bandwidth selection, as well as filters for second harmonic extraction and compression are examined. Simulations reveal the presence of axial sidelobes in the compressed echo waveform as the bandwidth of the transmitted chirp is increased. These sidelobes, resulting from the overlap of the fundamental and third harmonic bands with the second harmonic, cannot be removed using conventional Fourier filtering. Alternative filtering techniques which utilize the separation of the harmonic bands of a backscattered chirp in the joint time-frequency domain are suggested.en_HK
dc.languageengen_HK
dc.publisherCanadian Acoustical Association.en_HK
dc.relation.ispartofCanadian Acoustics - Acoustique Canadienneen_HK
dc.titleCoded excitation methods for ultrasound harmonic imagingen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0711-6659&volume=35&issue=2&spage=35&epage=46&date=2007&atitle=Coded+excitation+methods+for+ultrasound+harmonic+imagingen_HK
dc.identifier.emailYu, ACH:alfred.yu@hku.hken_HK
dc.identifier.authorityYu, ACH=rp00657en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-34547251781en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34547251781&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume35en_HK
dc.identifier.issue2en_HK
dc.identifier.spage35en_HK
dc.identifier.epage46en_HK
dc.publisher.placeCanadaen_HK
dc.identifier.scopusauthoridArshadi, R=15724292200en_HK
dc.identifier.scopusauthoridYu, ACH=8699317700en_HK
dc.identifier.scopusauthoridCobbold, RSC=7005052711en_HK

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