Journal ArticleDOI
Beam Steering with Linear Arrays
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TLDR
An analysis is presented of current techniques for improving ultrasound image quality using phased array methods including phase compensation, spatialcompounding, frequency compounding, and parallel processing.Abstract:
The principles and techniques of real-time imaging with phased array ultrasound scanners are reviewed. Topics include 1) the geometric optics of beam steering and focusing with a linear array in the transmit and receive modes; 2) limitations on image data acquisition due to ultrasound propagation velocity; 3) optical diffraction theory for linear arrays including effects of amplitude grating lobes. Limitations on the image quality of phased array imaging systems are also discussed, including 1) nonideal response of array transducers; 2) target ambiguities caused by phase error grating lobes; 3) refraction errors; 4) delay line design. Finally, an analysis is presented of current techniques for improving ultrasound image quality using phased array methods including phase compensation, spatial compounding, frequency compounding, and parallel processing.read more
Citations
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Journal ArticleDOI
Wavefront modulation and subwavelength diffractive acoustics with an acoustic metasurface
TL;DR: The demonstrated metasurface can not only steer an acoustic beam as expected from the generalized Snell's law, but also exhibits various unique properties such as conversion from propagating wave to surface mode, extraordinary beam-steering and apparent negative refraction through higher-order diffraction.
Journal ArticleDOI
High-speed ultrasound volumetric imaging system. I. Transducer design and beam steering
TL;DR: The authors describe the design considerations and preliminary evaluation of a high-speed, online volumetric ultrasound imaging system that uses the principles of pulse-echo, phased array scanning with a 2-D array transducer.
Journal ArticleDOI
A Sparse Aperture MIMO-SAR-Based UWB Imaging System for Concealed Weapon Detection
Xiaodong Zhuge,Alexander Yarovoy +1 more
TL;DR: A high-resolution imaging system based on the combination of ultrawideband transmission, multiple-input-multiple-output (MIMO) array, and synthetic aperture radar (SAR) is suggested and studied, showing a strong potential of the MIMO-SAR-based UWB system for security applications.
Journal ArticleDOI
Synthetic aperture techniques with a virtual source element
TL;DR: The use of the focus as a virtual element is examined, and the virtual source has been shown to exhibit the same behavior as an actual transducer element in response to synthetic aperture processing techniques.
Journal ArticleDOI
Beam steering with pulsed two-dimensional transducer arrays
Daniel H. Turnbull,F.S. Foster +1 more
TL;DR: The authors have undertaken a theoretical investigation of the focusing and steering properties of pulsed 2-D arrays to characterize the parameters required for medical imaging, such as element size, spacing, and number of elements.
References
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Cardiac imaging using a phased array ultrasound system. I. System design.
O T vonRamm,F L Thurstone +1 more
TL;DR: A new two-dimensional, real-time, high resolution ultrasound imaging system is described, which uses a linear array of ultrasound transducers to generate tomographic images of the heart in a circular sector format.