Mr. Kevin Owen Profile

Kevin Owen

at Univ of Virginia

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Author

Publications (2)

Proceedings Article | 10 March 2008 Paper

Beamformer enhancement by post-processing for improved spatial resolution and signal-to-noise ratio

Kevin Owen, Drake Guenther, William Walker

Proceedings Volume 6920, 692002 (2008) https://doi.org/10.1117/12.772942

KEYWORDS: Signal to noise ratio, Phased arrays, Spatial resolution, Point spread functions, Radon, Ultrasonography, Spatial filters, Optical simulations, Electronic filtering, Systems modeling

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Proceedings Article | 16 March 2006 Paper

The sonic window: second generation results

William Walker, Michael Fuller, Edward Brush, Matthew D. C. Eames, Kevin Owen, Karthik Ranganathan, Travis Blalock, John Hossack

Proceedings Volume 6147, 61470B (2006) https://doi.org/10.1117/12.661507

KEYWORDS: Digital signal processing, Ultrasonography, Transducers, Prototyping, Analog electronics, LCDs, Signal processing, Phased arrays, System integration, Signal to noise ratio

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Medical Ultrasound Imaging is widely used clinically because of its relatively low cost, portability, lack of ionizing radiation, and real-time nature. However, even with these advantages ultrasound has failed to permeate the broad array of clinical applications where its use could be of value. A prime example of this untapped potential is the routine use of ultrasound to guide intravenous access. In this particular application existing systems lack the required portability, low cost, and ease-of-use required for widespread acceptance. Our team has been working for a number of years to develop an extremely low-cost, pocket-sized, and intuitive ultrasound imaging system that we refer to as the "Sonic Window." We have previously described the first generation Sonic Window prototype that was a bench-top device using a 1024 element, fully populated array operating at a center frequency of 3.3 MHz. Through a high degree of custom front-end integration combined with multiplexing down to a 2 channel PC based digitizer this system acquired a full set of RF data over a course of 512 transmit events. While initial results were encouraging, this system exhibited limitations resulting from low SNR, relatively coarse array sampling, and relatively slow data acquisition. We have recently begun assembling a second-generation Sonic Window system. This system uses a 3600 element fully sampled array operating at 5.0 MHz with a 300 micron element pitch. This system extends the integration of the first generation system to include front-end protection, pre-amplification, a programmable bandpass filter, four sample and holds, and four A/D converters for all 3600 channels in a set of custom integrated circuits with a combined area smaller than the 1.8 x 1.8 cm footprint of the transducer array. We present initial results from this front-end and present benchmark results from a software beamformer implemented on the Analog Devices BF-561 DSP. We discuss our immediate plans for further integration and testing. This second prototype represents a major reduction in size and forms the foundation of a fully functional, fully integrated, pocket sized prototype.

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