A Strict-Time Distributed Architecture for Digital Beamforming of Ultrasound Signals

This paper presents a strict timing-coherent digital signal processing architecture. The main requirement is that programmable events can be produced within predictable time intervals with tight accuracy (timing errors <; 1 ns). This characteristic is essential to ultrasound beamforming. The followed approach defines a modular and scalable architecture (AMPLIA), which is configured as a multibranch pipeline. This arrangement guarantees timing coherence along all the system, independent of the number of processing modules. An important element of the architecture is the interface and control unit (ICU), which decouples the asynchronous communication channel with a host computer to the strictly timing-coherent domain of the signal processing system. Furthermore, in the beamforming application, several elements have a great impact on system timing resolution, particularly when dynamic focusing is involved. This paper addresses the issues of coded excitation, analog-to-digital (A/D) conversion, and signal interpolation in achieving dynamic focusing by progressive focusing correction with processing rates of several gigasamples per second and tight timing accuracy.

[1]  Chi Chung Ko,et al.  Approximation of a variable-length delay line by using tapped delay line processing , 1988 .

[2]  Jørgen Arendt Jensen,et al.  Experimental ultrasound system for real-time synthetic imaging , 1999, 1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027).

[3]  T. Azuma,et al.  3D ultrasound imaging system using Fresnel ring array & high voltage multiplexer IC , 2004, IEEE Ultrasonics Symposium, 2004.

[4]  R. Mucci A comparison of efficient beamforming algorithms , 1984 .

[5]  G. Kino Acoustic waves : devices, imaging, and analog signal processing , 1987 .

[6]  C. Fritsch,et al.  P2D-4 A Front-End Ultrasound Array Processor Based on LVDS Analog-to-Digital Converters , 2006, 2006 IEEE Ultrasonics Symposium.

[7]  R. Y. Chiao,et al.  Coded excitation for diagnostic ultrasound: a system developer's perspective , 2003, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[8]  G. Kino,et al.  Real-Time Digital Image Reconstruction: A Description of Imaging Hardware and an Analysis of Quantization Errors , 1984, IEEE Transactions on Sonics and Ultrasonics.

[9]  M. Parrilla,et al.  Fast focal law computing for Non-Destructive Testing with phased arrays , 2007 .

[10]  Jørgen Arendt Jensen,et al.  A new architecture for a single-chip multi-channel beamformer based on a standard FPGA , 2001, 2001 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.01CH37263).

[11]  O. Martinez,et al.  The progressive focusing correction technique for ultrasound beamforming , 2006, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.