Journal ArticleDOI
Theoretical assessment of a synthetic aperture beamformer for real-time 3-D imaging
C.R. Hazard,G.R. Lockwood +1 more
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The results show that the proposed beamformer produces a radiation pattern equivalent to a conventional beamformer using baseband demodulation, provided that the sampling rate is approximately 10 times the center frequency of the transducer (34% bandwidth pulse).Abstract:
A real-time 3-D imaging system requires the development of a beamformer that can generate many beams simultaneously. In this paper, we discuss and evaluate a suitable synthetic aperture beamformer. The proposed beamformer is based on a pipelined network of high speed digital signal processors (DSP). By using simple interpolation-based beamforming, only a few calculations per pixel are required for each channel, and an entire 2-D synthetic aperture image can be formed in the time of one transmit event. The performance of this beamformer was explored using a computer simulation of the radiation pattern. The simulations were done for a full 64-element array and a sparse array with the same receive aperture but only five transmit elements. We assessed the effects of changing the sampling rate and amplitude quantization by comparing the relative levels of secondary lobes in the radiation patterns. The results show that the proposed beamformer produces a radiation pattern equivalent to a conventional beamformer using baseband demodulation, provided that the sampling rate is approximately 10 times the center frequency of the transducer (34% bandwidth pulse). The simulations also show that the sparse array is not significantly more sensitive to delay or amplitude quantization than the full array.read more
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Journal ArticleDOI
Ultrafast imaging in biomedical ultrasound
Mickael Tanter,Mathias Fink +1 more
TL;DR: In this article, the basic principles and implementation of ultrafast imaging in biomedical ultrasound are illustrated and discussed in particular, present and future applications of ultra-fast imaging for screening, diagnosis, and therapeutic monitoring.
Journal ArticleDOI
3D ultrafast ultrasound imaging in vivo.
Jean Provost,Clement Papadacci,Juan Esteban Arango,Marion Imbault,Mathias Fink,Jean-Luc Gennisson,Mickael Tanter,Mathieu Pernot +7 more
TL;DR: The potential of 3D Ultrafast Ultrasound Imaging for the 3D mapping of stiffness, tissue motion, and flow in humans in vivo is demonstrated and promises new clinical applications of ultrasound with reduced intra--and inter-observer variability.
Journal ArticleDOI
Mutual information-based rigid and nonrigid registration of ultrasound volumes
Raj Shekhar,Vladimir Zagrodsky +1 more
TL;DR: The registration of ultrasound volumes based on the mutual information measure is investigated, a technique originally applied to multimodality registration of brain images, and should work well for a variety of applications examining serial anatomic and physiologic changes.
Journal ArticleDOI
High-contrast ultrafast imaging of the heart
TL;DR: Spatial coherent compounding provided a strong improvement of the imaging quality, even with a small number of transmitted diverging waves and a high frame rate, which allows imaging of the propagation of electromechanical and shear waves with good image quality.
Journal ArticleDOI
Ultrasound research scanner for real-time synthetic aperture data acquisition
Jørgen Arendt Jensen,O. Holm,L.J. Jerisen,Henrik Bendsen,Svetoslav Ivanov Nikolov,Borislav Georgiev Tomov,Peter Munk,M. Hansen,K. Salomonsen,Jens Munk Hansen,K. Gormsen,H.M. Pedersen,Kim Gammelmark +12 more
TL;DR: The overall system concept is presented along with its implementation and examples of B-mode and in vivo synthetic aperture flow imaging, and the system is capable of performing real-time beamforming for conventional imaging methods using linear, phased, and convex arrays.
References
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Synthetic aperture imaging for small scale systems
TL;DR: Multi-element synthetic aperture imaging methods suitable for applications with severe cost and size limitations are explored in this article, where each method uses different spatial frequencies and acquisition strategies for imaging, and therefore different sets of active transmit/receive element combinations.
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.
Journal ArticleDOI
High-speed ultrasound volumetric imaging system. II. Parallel processing and image display
TL;DR: The design, application, and evaluation of parallel processing to the high-speed volumetric ultrasound imaging system, which uses pulse-echo phased array principles to steer a 2-D array transducer of 289 elements in a pyramidal scan format is described.
Journal ArticleDOI
Explososcan: a parallel processing technique for high speed ultrasound imaging with linear phased arrays.
TL;DR: In this article, a parallel processing scheme has been implemented which enables the data acquisition rate to increase by a factor of four through the simultaneous acquisition of four B-mode image lines from each individual broadened transmit pulse.
Journal ArticleDOI
Real-time 3-D ultrasound imaging using sparse synthetic aperture beamforming
TL;DR: By mechanically rocking the array, in a way similar to what is done with an annular array, a 3-D set of images can be collected in the time normally required for a single image.