Synthetic aperture ultrasonic imaging system using a minimum or

Details Synthetic aperture ultrasonic imaging system using a minimum or Synthetic aperture ultrasonic imaging system using a minimum or

1991-11-15

1994-01-11

Envall, Jr., Roy N.

Boots, shoes, and leggings

36441313, 12866007, 12866101, G06F 1500, G01N 2900

Patent

active

052787575

ABSTRACT:
A synthetic aperture ultrasonic imaging system for imaging a target with a resolution limited by a designated aperture. A phased array of nonuniformly spaced ultrasound transducers having an average inter-transducer spacing which is greater than a .lambda./2 Nyquist spacing for the transducers is used for imaging in a manner so as to either obtain a desired point spread function which is unattainable by a single image taken by the nonuniformly spaced transducers or to provide coarray equivalence to a phased array of transducers which are uniformly spaced at the .lambda./2 Nyquist spacing for the designated aperture. Coarray equivalence makes possible the technique of applying amplitude weightings to each of the nonuniformly spaced ultrasound transducers during transmit and receive modes and by forming a number of component images which when added together form a sum image substantially equivalent to a single image formed by a scan beam of the uniformly spaced transducers with the designated aperture. The complex values of the resulting component images are then added on a point by point basis, preserving phase, such that a point spread function of the sum image is substantially equivalent to the desired point spread function of the single image formed by the uniformly spaced transducers with the designated ape

REFERENCES:
patent: 4543829 (1985-10-01), Lerch
patent: 4553437 (1985-11-01), Luthra et al.
patent: 4604697 (1986-08-01), Luthra et al.
patent: 5111823 (1992-05-01), Cohen
Greene et al., "Sparse Array Performance", Journal of the Acoustical Soc. of Am., vol. 63, pp. 1866-1872, (Jun. 1978).
Haubrich, "Array Design", Bulletin of the Seismological Soc. of Am., vol. 58, pp. 977-991, (Jun. 1968).
Ishiguro, "Minimum Redundancy Linear Arrays for a Large Number of Antennas", Radio Science, vol. 15, pp. 1163-1170, (Nov. 1980).
S. A. Kassam & R. Hoctor, "The Unifying Role of the Coarray in Aperture Synthesis for Coherent and Incoherent Imaging", Proceedings of the IEEE, vol. 78, pp. 735-752, (Apr. 1990).
P. N. Keating et al., "Holographic Aperture Synthesis Via a Transmitter Array", Acoustical Holography, vol. 6, pp. 485-506 (1975).
J. K. Kreuzer, "A Synthetic Aperture Coherent Imaging Technique", Acoustical Holography, vol. 3, pp. 287-315 (1971).
A. Macovski, "Ultrasonic Imaging Using Arrays", Proc. IEEE, Special Issue on Acoustic Imaging, vol. 67, pp. 484-495, Apr. 1979.
Moffet, "Minimum Redundancy Linear Arrays", IEEE Trans. Antennas and Prop., vol. AP-16, pp. 172-175, (Mar. 1968).
K. Nagai, "Synthetic Aperture Ultrasonic Imagery", Advances in Electronics and Electron Physics, vol. 70, pp. 215-314, 1988.
K. Nitadori, "Synthetic Aperture Approach to Multi-Beam Scanning Acoustical Imaging", Acoustical Holography, vol. 6, pp. 507-523, 1975.
Sherrill et al., "In Situ Optimal Reshading of Arrays with Failed Elements", IEEE Journal of Oceanic Engineering, vol. OE-12, pp. 155-162 (Jan. 1987).
J. L. Sutton, "Underwater Acoustic Imaging", Proc. IEEE, Special Issue on Acoustic Imaging, vol. 67, pp. 554-566, Apr. 1979.
W. H. Wells, "Acoustical Imaging with Linear Transducer Arrays", Acoustical Holography, vol. 2, pp. 87-103 (1969).
Zrnic et al., "A Switched Pattern Radar Antenna Array", IEEE Trans. on Antennas and Prop, vol. AP-35, pp. 1104-1110, (Oct. 1987).

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