NDLI: Sidelobe reduction in high frame rate echocardiography

Content Provider	IEEE Xplore Digital Library
Author	Hasegawa, H. Kanai, H.
Copyright Year	2012
Description	Author affiliation: Grad. Sch. of Eng., Tohoku Univ., Sendai, Japan (Kanai, H.) \|\| Grad. Sch. of Biomed. Eng., Tohoku Univ., Sendai, Japan (Hasegawa, H.)
Abstract	The measurement of propagation of spontaneous vibration of the heart would be useful for evaluation of myocardial function and viscoelasticity. For this purpose, we have developed high frame rate echocardiography over 300 Hz using parallel receive beamforming with diverging beam transmission (PBFDB). However, sidelobe level increased due to the use of unfocused transmit beams. In the present study, a method for reduction of sidelobe level was developed. After applying delays to the signals received by transducer elements in receive beamforming, there is an almost linear relationship between the residual phase of the signal and element's lateral position when the signals are come from an echo from a scatterer very near to the focal point (in the direction of main lobe). On the other hand, there is not a linear relationship when the signals come from a scatterer away from the focal point (in the directions of sidelobes). In the present study, such difference in the signal phases was evaluated by the magnitude squared coherence function (MSCF) of the received signals for all the pairs of two neighboring elements. When the phases of received signals change linearly (echo from main lobe), the difference between signal phases of two neighboring elements are constant across the array. In such cases, MSCF becomes 1. MSCF decreases (minimum is 0) when the phase differences are not constant (echo from sidelobe). Therefore, by weighting beamformed RF signals using MSCF, echoes come from sidelobes can be suppressed. Sidelobe levels were evaluated using fine nylon wires. Using MSCF as a weighting function, the sidelobe level could be reduced significantly. The average sidelobe level of PBFDB with MSCF was lower than that of conventional beamforming (CB) by 4.8 dB. In in vivo measurement of the heart of a 23-year-old healthy male, the image contrast was significantly improved.
Starting Page	1267
Ending Page	1270
File Size	724875
Page Count	4
File Format	PDF
ISBN	9781467345613
ISSN	19485719
e-ISBN	9781467345620
DOI	10.1109/ULTSYM.2012.0316
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-10-07
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Array signal processing Heart Coherence Imaging Acoustics Silicon Delay effects
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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