Journal ArticleDOI
Digital beamforming in ultrasound
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TLDR
A relatively simple design that replaces each analog delay line with a tapped, digital shift register (DSR) and a digital phase shift operation adjusted for midband will provide the desired performance, provided that the sampling rate of the signal at the input to the DSR is 4 to 10 times the bandwidth.Abstract:
The effects on array gain and sidelobe level of a practical digital beamforming (DBF) processor under the wideband conditions typical of ultrasound is discussed. It is concluded that a relatively simple design that replaces each analog delay line with a tapped, digital shift register (DSR) and a digital phase shift operation adjusted for midband will provide the desired performance, provided that the sampling rate of the signal at the input to the DSR is 4 to 10 times the bandwidth. More realistically, when nonidealized passbands are taken into account and the typical condition whereby the transducer frequency is about twice the bandwidth is considered, the rule of thumb for the sampling rate is that it must be 4 to 10 times the transducer frequency. >read more
Citations
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Synthetic aperture imaging for small scale systems
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Proceedings ArticleDOI
Evolution of ultrasound beamformers
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A study of synthetic-aperture imaging with virtual source elements in B-mode ultrasound imaging systems
Moo-Ho Bae,Mok-Kun Jeong +1 more
TL;DR: An all point transmit and receive focusing method based on transmit synthetic focusing combined with receive dynamic focusing in a linear array transducer that improves upon the lateral resolution and sidelobe level at all imaging depths and increases the transmit power and image signal-to-noise ratio (SNR).
Journal ArticleDOI
Time-delay- and time-reversal-based robust capon beamformers for ultrasound imaging
Zhisong Wang,Jian Li,Renbiao Wu +2 more
TL;DR: This paper considers a recent promising robust Capon beamformer (RCB), which restores the appeal of SCB including its high resolution and superb interference suppression capabilities, and also retains the attractiveness of DAS including its robustness against steering vector errors.
Journal ArticleDOI
Fourier-domain beamforming: the path to compressed ultrasound imaging
TL;DR: In this paper, the authors extend the concept of beamforming in frequency to a general concept, which allows exploitation of the low bandwidth of the ultrasound signal and bypassing of the oversampling dictated by digital implementation of beamformers in time.
References
More filters
Journal ArticleDOI
FIR filter design over a discrete powers-of-two coefficient space
TL;DR: In this article, a digital filter with discrete coefficient values selected from the powers-of-two coefficient space is designed using the methods of integer programming, and the frequency responses obtained are shown to be superior to those obtained by simply rounding the coefficients.
Book
Microwave imaging techniques
TL;DR: The Mathematics of Wideband Effects Problems in Microwave Imaging Diversity Transmitter-Location Diversity Deconvolution Adaptive Beamforming I Adaptive beamforming II Data Reduction Superresolution Display Techniques References Index
Proceedings ArticleDOI
Real-time phased array imaging using digital beam forming and autonomous channel control
Matthew O'Donnell,William Ernest Engeler,John T. Pedicone,A.M. Itani,Sharbel E. Noujaim,Robert John Dunki-Jacobs,W.M. Leue,Carl L. Chalek,Lowell Scott Smith,J.E. Piel,R.L. Harris,Kenneth Brakeley Welles,W.L. Hinrichs +12 more
TL;DR: A real-time phased-array imaging system for medical applications based on the principles of digital beam formation and autonomous channel control that is capable of high-precision steering, dynamic apodization, dynamic focusing, and highly accurate beamforming using sampling rates close to the Nyquist rate over the medical diagnostic frequency range.
Journal ArticleDOI
A new digital phased array system for dynamic focusing and steering with reduced sampling rate.
Tai K. Song,Song B. Park +1 more
TL;DR: To reduce hardware requirements and the bandwidth required for digital processings, this paper describes an efficient method to generate the sampling clocks for dynamic focusing and steering and some modified bandwidth sampling techniques to reduce the sampling rate for signal digitization.