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Conference Paper: A leastsquares vector flow estimator for synthetic aperture imaging
Title  A leastsquares vector flow estimator for synthetic aperture imaging 

Authors  
Keywords  Aperturedomain data Leastsquares estimation Synthetic aperture Vector flow imaging 
Issue Date  2009 
Citation  Proceedings  Ieee Ultrasonics Symposium, 2009 How to Cite? 
Abstract  This paper presents a leastsquares (LS) vector flow estimator that is intended to calculate axial and lateral velocities using aperturedomain Doppler data from multiple transmit point sources and multiple receive apertures realized via the synthetic aperture (SA) technique. Our new estimator comprises two main stages. First, for each transmit point and receive aperture, we obtain aperturedomain Doppler ensembles and use them to compute a frequency estimate (via the lagone autocorrelator) for every spatial point in imaging view. Subsequently, by noting that each transmit point and receive aperture deviates in flow angle, we estimate flow vectors through creating a set of Doppler equations with two unknowns (i.e. axial and lateral velocities) from the frequency estimates and solving this equation set as an overdetermined LS problem. To evaluate the performance of new estimator, Field II simulations were performed for a scenario with a 5mmdiameter steady flow tube (tube angle: 0°90°, center velocity: 025cm/s). For these simulations, a 5.5MHz linear array with 128 elements was used; prebeamform data was acquired for 97 virtual point sources (0.3mm spacing, 32 elements), and 12 twocycle pulses were fired through each point source (PRF: 5kHz). Our LS estimator was then applied to a few different transmitreceive SA imaging configurations (e.g. 97 transmit points and 3 receive apertures). Results show that, if a multitransmit configuration is used, the LS estimator is more capable of providing vector flow maps that roughly resemble the theoretical profile. ©2009 IEEE. 
Persistent Identifier  http://hdl.handle.net/10722/99815 
ISSN  
References 
DC Field  Value  Language 

dc.contributor.author  Tsang, IKH  en_HK 
dc.contributor.author  Yiu, BYS  en_HK 
dc.contributor.author  Yu, ACH  en_HK 
dc.date.accessioned  20100925T18:45:16Z   
dc.date.available  20100925T18:45:16Z   
dc.date.issued  2009  en_HK 
dc.identifier.citation  Proceedings  Ieee Ultrasonics Symposium, 2009  en_HK 
dc.identifier.issn  10510117  en_HK 
dc.identifier.uri  http://hdl.handle.net/10722/99815   
dc.description.abstract  This paper presents a leastsquares (LS) vector flow estimator that is intended to calculate axial and lateral velocities using aperturedomain Doppler data from multiple transmit point sources and multiple receive apertures realized via the synthetic aperture (SA) technique. Our new estimator comprises two main stages. First, for each transmit point and receive aperture, we obtain aperturedomain Doppler ensembles and use them to compute a frequency estimate (via the lagone autocorrelator) for every spatial point in imaging view. Subsequently, by noting that each transmit point and receive aperture deviates in flow angle, we estimate flow vectors through creating a set of Doppler equations with two unknowns (i.e. axial and lateral velocities) from the frequency estimates and solving this equation set as an overdetermined LS problem. To evaluate the performance of new estimator, Field II simulations were performed for a scenario with a 5mmdiameter steady flow tube (tube angle: 0°90°, center velocity: 025cm/s). For these simulations, a 5.5MHz linear array with 128 elements was used; prebeamform data was acquired for 97 virtual point sources (0.3mm spacing, 32 elements), and 12 twocycle pulses were fired through each point source (PRF: 5kHz). Our LS estimator was then applied to a few different transmitreceive SA imaging configurations (e.g. 97 transmit points and 3 receive apertures). Results show that, if a multitransmit configuration is used, the LS estimator is more capable of providing vector flow maps that roughly resemble the theoretical profile. ©2009 IEEE.  en_HK 
dc.language  eng  en_HK 
dc.relation.ispartof  Proceedings  IEEE Ultrasonics Symposium  en_HK 
dc.subject  Aperturedomain data  en_HK 
dc.subject  Leastsquares estimation  en_HK 
dc.subject  Synthetic aperture  en_HK 
dc.subject  Vector flow imaging  en_HK 
dc.title  A leastsquares vector flow estimator for synthetic aperture imaging  en_HK 
dc.type  Conference_Paper  en_HK 
dc.identifier.email  Yu, ACH:alfred.yu@hku.hk  en_HK 
dc.identifier.authority  Yu, ACH=rp00657  en_HK 
dc.description.nature  link_to_subscribed_fulltext   
dc.identifier.doi  10.1109/ULTSYM.2009.5441624  en_HK 
dc.identifier.scopus  eid_2s2.077952849628  en_HK 
dc.identifier.hkuros  155474  en_HK 
dc.relation.references  http://www.scopus.com/mlt/select.url?eid=2s2.077952849628&selection=ref&src=s&origin=recordpage  en_HK 
dc.publisher.place  United States  en_HK 
dc.identifier.scopusauthorid  Tsang, IKH=26657657600  en_HK 
dc.identifier.scopusauthorid  Yiu, BYS=26657783600  en_HK 
dc.identifier.scopusauthorid  Yu, ACH=8699317700  en_HK 