Coded excitation for transmission dynamic focusing of vibratory

Details Coded excitation for transmission dynamic focusing of vibratory Coded excitation for transmission dynamic focusing of vibratory

1989-12-26

1991-05-14

Jaworski, Francis

Surgery

Truss

Pad

73625, 73626, 367103, 367105, A61B 800, G01N 2900

Patent

active

050147129

ABSTRACT:
A method for imaging a sample with a beam of vibratory energy from an array of transducers excites the array with successive ones of a plurality M of coded excitation signal sets with each set occurring in a different one of successive excitation time intervals. Each different set has signals with a different code. An excitation beam, produced by the array, is focused into the sample at successively smaller distances, along a selected ray path from the array, during each successive excitation time interval. A reception beam is focused along the ray path at successively greater distances from a minimum distance away from the array during each successive one of a like plurality of reception time intervals, for receiving, during each reception time interval, return response signals reflected from the sample. The received signals are processed and all channels are coherently summed prior to cross-correlating the summed signals with reference signals derived from the coded signals of the set used for the associated excitation time interval, to recover a response signal substantially only from a volume of the sample at that distance associated with each time interval. Apparatus for implementing this method is disclosed.

REFERENCES:
patent: 4351038 (1982-09-01), Alais
patent: 4395912 (1983-08-01), Hassler
patent: 4534221 (1985-08-01), Fife et al.
patent: 4569231 (1986-02-01), Carnes et al.
patent: 4788981 (1988-12-01), Nagasaki et al.
patent: 4870971 (1989-10-01), Russell et al.

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