Investigation of Sound Speed Errors in Adaptive Beamforming

被引:5
作者
Holfort, Iben Kraglund [1 ]
Gran, Fredrik [2 ]
Jensen, Jorgen Arendt [1 ]
机构
[1] Tech Univ Denmark, Ctr Fast Ultrasound Imaging, Dept Elect Engn, DK-2800 Lyngby, Denmark
[2] GN Resound, DK-2750 Ballerup, Denmark
来源
2008 IEEE ULTRASONICS SYMPOSIUM, VOLS 1-4 AND APPENDIX | 2008年
关键词
D O I
10.1109/ULTSYM.2008.0260
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
Previous studies have shown that adaptive beamformers provide a significant increase of resolution and contrast, when the propagation speed is known precisely. This paper demonstrates the influence of sound speed errors on two adaptive beamformers; the Minimum Variance (MV) beamformer and the Amplitude and Phase (APES) beamformer. Simulations of a single point target are carried out in Field 11, and a percentage error is applied on the speed of sound. As the error increases, MV and APES provide amplitude drops of 17 dB and 3 dB on the signal strength. Two approaches to overcome this amplitude drop is proposed; diagonal loading (DL) and forward-backward (FB) averaging of the covariance matrix. The investigations show that DL provides a slightly decreased resolution and amplitude compared to FB. It is noted that APES provides more robust estimates than MV at the mere expense of a slight decrease of resolution. From the investigations, it is concluded the performance of the adaptive beamformers are not outperformed by the conventional delay-and-sum beamformer.
引用
收藏
页码:1080 / +
页数:2
相关论文
共 14 条
[1]   HIGH-RESOLUTION FREQUENCY-WAVENUMBER SPECTRUM ANALYSIS [J].
CAPON, J .
PROCEEDINGS OF THE IEEE, 1969, 57 (08) :1408-&
[2]   COMPREHENSIVE COMPILATION OF EMPIRICAL ULTRASONIC PROPERTIES OF MAMMALIAN-TISSUES [J].
GOSS, SA ;
JOHNSTON, RL ;
DUNN, F .
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 1978, 64 (02) :423-457
[3]   Minimum variance beamforming for high frame-rate ultrasound imaging [J].
Holfort, Then Kraglund ;
Gran, Fredrik ;
Jensen, Jorgen Arendt .
2007 IEEE ULTRASONICS SYMPOSIUM PROCEEDINGS, VOLS 1-6, 2007, :1541-1544
[4]  
Jensen J. A., 1996, Medical & Biological Engineering & Computing, V34, P351
[5]   CALCULATION OF PRESSURE FIELDS FROM ARBITRARILY SHAPED, APODIZED, AND EXCITED ULTRASOUND TRANSDUCERS [J].
JENSEN, JA ;
SVENDSEN, NB .
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, 1992, 39 (02) :262-267
[6]  
Li J, 2006, ROBUST ADAPTIVE BEAMFORMING, P1
[7]   An adaptive filtering approach to spectral estimation and SAR imaging [J].
Li, J ;
Stoica, P .
IEEE TRANSACTIONS ON SIGNAL PROCESSING, 1996, 44 (06) :1469-1484
[8]  
Mann JA, 2002, ULTRASON, P1807
[9]  
Sasso M, 2005, P IEEE INT C AC SPEE, V2, P489
[10]  
SHAN TJ, 1985, IEEE T ACOUST SPEECH, V33, P527, DOI 10.1109/TASSP.1985.1164583