NDLI: 5B-6 Chirp Pulse-Compression Imaging Using a 40-MHz Annular Array

Content Provider	IEEE Xplore Digital Library
Author	Mamou, J. Ketterling, J.A. Silverman, R.H.
Copyright Year	2007
Description	Author affiliation: Riverside Res. Inst., New York (Mamou, J.; Ketterling, J.A.; Silverman, R.H.)
Abstract	Very-high-frequency (>30 MHz) ultrasound allows fine-resolution imaging at the expense of depth-of-field and acoustic penetration depth. Mechanically scanned annular arrays have demonstrated that they can extend depth-of-field significantly. This study investigates chirp-coded excitation to increase penetration depth. A 40-MHz, five-element annular array with a focal length of 12 mm and a total aperture of 6 mm was excited with a 4-mus linear chirp spanning 15 to 65 MHz. The chirp was optimized based on ex vivo experiments and computer simulations. The chirp was tapered in order to limit pulse- compression axial side-lobe artifacts. To form images, all 25 transmit/receive signal combinations were digitized and post- processed for compression and synthetic focusing. Compression consisted of linearly filtering the signals with the time-reversed excitation chirp modulated by a Dolph-Chebyshev window. A 12-mum wire phantom was scanned to quantify lateral and axial resolutions; results showed that the chirp did not significantly degrade resolution. Experiments with scattering phantoms showed that penetration depth was improved by 1.8 mm (i.e., 25%). Images of mouse embryos, human eye-bank eyes, and low- contrast phantoms also showed marked improvements in image- quality.
Starting Page	339
Ending Page	342
File Size	7369490
Page Count	4
File Format	PDF
ISBN	9781424413836
ISSN	10510117
DOI	10.1109/ULTSYM.2007.95
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-10-28
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Chirp Ultrasonic imaging Image coding Imaging phantoms Acoustic imaging Signal resolution Acoustic pulses Apertures Computer simulation Pulse compression methods
Content Type	Text
Resource Type	Article

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