Method and apparatus for digital delay of ultrasound signals upo

Details Method and apparatus for digital delay of ultrasound signals upo Method and apparatus for digital delay of ultrasound signals upo

1987-05-06

1988-11-29

Jaworski, Francis J.

Surgery

Truss

Pad

73625, 367103, A61B 1000

Patent

active

047873922

ABSTRACT:
A method and apparatus for digitally delaying ultrasound signals, which are reflected from a boundary surface inside of an examination subject, upon reception of the signals at an ultrasound receiver employ, in each channel, a shift register, a first multiplexer, another register, and interpolator and a further multiplexer to effect a selected delay. A number of interpolated ultrasound signals is formed from two successively received ultrasound signals. If the successive ultrasound signals are shifted by .DELTA..tau., the interpolated ultrasound signals will be shifted by a smaller time difference relative to each other, dependent on the fineness of the interpolation. That interpolated ultrasound signal or that received ultrasound signal having a delay value which is closest to a selected desired delay value is employed for further signal processing. A high precision in the chronological resolution can thus be achieved with a relatively low sampling rate in comparison to the chronological resolution.

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"Donar: A Computer Processing System to Extend Ultrasonic Pulse-Echo T-Sting", Lees et al., Ultrasonics, Jul. 1973, vol. 11, No. 4, pp. 165-173.

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