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Fast parametric beamformer for synthetic aperture imaging.

Svetoslav Ivanov Nikolov¹, Jørgen Arendt Jensen, Borislav Gueorguiev Tomov

¹Dept. of Electr. Eng., Tech. Univ. of Denmark, Lyngby. sn@elektro.dtu.dk

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|November 7, 2008

Summary

This study presents a real-time delay-and-sum synthetic aperture beamformer for ultrasound imaging. Optimized for the SARUS system, it achieves high-speed, high-resolution image formation using FPGAs.

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Area of Science:

Medical Imaging
Ultrasound Technology
Signal Processing

Background:

Synthetic aperture imaging offers high-resolution ultrasound but requires significant computational power.
Real-time implementation of beamforming algorithms is crucial for advanced ultrasound applications.

Purpose of the Study:

To design and implement an efficient, real-time delay-and-sum synthetic aperture beamformer.
To optimize the beamformer for the novel Synthetic Aperture Real-time UltraSound (SARUS) scanner architecture.

Main Methods:

Parametric description of beamforming delays and apodization coefficients.
Recursive delay calculation inspired by the CORDIC algorithm.
Piecewise linear approximation for apodization coefficients and FPGA implementation.

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Main Results:

The beamformer achieves high-speed processing: 4600 low-resolution images per second per module.
Side and grating lobes are suppressed below -86 dB.
Optimized implementation utilizes FPGAs for efficient channel processing and image summation.

Conclusions:

The designed beamformer enables real-time, high-resolution synthetic aperture ultrasound imaging.
The modular design and FPGA optimization provide a scalable and efficient solution.
Precise calculations and internal summation minimize artifacts and bandwidth requirements.