Journal ArticleDOI
Synthetic aperture imaging for small scale systems
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TLDR
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.Abstract:
Multi-element synthetic aperture imaging methods suitable for applications with severe cost and size limitations are explored. Array apertures are synthesized using an active multi-element receive subaperture and a multi-element transmit subaperture defocused to emulate a single-element spatial response with high acoustic power. Echo signals are recorded independently by individual elements of the receive subaperture. Each method uses different spatial frequencies and acquisition strategies for imaging, and therefore different sets of active transmit/receive element combinations. Following acquisition, image points are reconstructed using the complete data set with full dynamic focus on both transmit and receive. Various factors affecting image quality have been evaluated and compared to conventional imagers through measurements with a 3.5 MHz, 128-element transducer array on different gel phantoms. Multielement synthetic aperture methods achieve higher electronic signal to noise ratio and better contrast resolution than conventional synthetic aperture techniques, approaching conventional phased array performance. >read more
Citations
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References
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L.N. Bohs,Gregg E. Trahey +1 more
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Apparatus and method for imaging small cavities
Sallee J. Proudian,Michael J. Eberle,Adam D. Savakus,Horst F. Kiepen,Douglas N. Stephens,David H. Rammler,Claudio I. Zanelli +6 more
TL;DR: In this article, an in vivo imaging device is provided for producing real-time images of small, moving or stationary cavities and surrounding tissue structure, which includes a probe assembly of very small dimensions and preferably sufficiently small to fit within cavities having a diameter on the order of that of a human coronary artery.
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Ultrasonic texture motion analysis: theory and simulation
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TL;DR: This study sets the ground for the development of an ultrasonic strain gauge particularly useful for the assessment of biomechanical soft tissue and fluid flow properties based on speckle tracking.
Journal ArticleDOI
Some Early Developments in Synthetic Aperture Radar Systems
TL;DR: The basic principle and later extensions to the theory are described and the first experimental verification at the University of Illinois are given as well as the results of subsequent experiments.
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