Analysis of signal coherence in ultrasound beamforming

Coherence factor weighting is used to suppress sidelobes, reduce artifacts, and improve the contrast and spatial resolution. The method provides a less hardware demanding solution with acceptable results. We conduct an analysis on coherence factor (CF) and a two-aperture coherence (TAC) estimation for the purpose of general understanding and fast estimation. A simulation was implemented based on linear description of ultrasound system and a simplified lateral scatterer distribution at the region of interest to analyze differences. Characters of CF and TAC for a point, homogeneous speckle, and a point and a cyst within homogeneous speckle environment under narrow and broad band were simulated.

[1]  Pai-Chi Li,et al.  Performance Evaluation of Coherence-Based Adaptive Imaging Using Clinical Breast Data , 2007, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[2]  J. Capon.  High-resolution frequency-wavenumber spectrum analysis , 1969 .

[3]  A. Austeng,et al.  Benefits of minimum-variance beamforming in medical ultrasound imaging , 2009, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[4]  Jesse Yen,et al.  Sidelobe suppression in ultrasound imaging using dual apodization with cross-correlation , 2008, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[5]  M. O'Donnell,et al.  Coherence factor of speckle from a multi-row probe , 1999, 1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027).

[6]  J. Camacho,et al.  Phase Coherence Imaging , 2009, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[7]  F. Gran,et al.  Broadband minimum variance beamforming for ultrasound imaging , 2009, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[8]  J. Yen,et al.  Performance improvement of fresnel beamforming using dual apodization with cross-correlation , 2013, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[9]  Jørgen Arendt Jensen,et al.  Linear description of ultrasound imaging systems: Notes for the International Summer School on Advanced Ultrasound Imaging at the Technical University of Denmark , 1999 .

[10]  Pai-Chi Li,et al.  Adaptive imaging using the generalized coherence factor. , 2003, IEEE transactions on ultrasonics, ferroelectrics, and frequency control.

[11]  J. Yen,et al.  Evaluating the robustness of dual apodization with cross-correlation , 2009, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[12]  Raoul Mallart,et al.  The van Cittert–Zernike theorem in pulse echo measurements , 1991 .

[13]  R. M. Cramblitt,et al.  Generation of non-Rayleigh speckle distributions using marked regularity models , 1999, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[14]  Francois Vignon,et al.  Capon beamforming in medical ultrasound imaging with focused beams , 2008, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.