Method and apparatus for delaying an ultrasound signal

Details Method and apparatus for delaying an ultrasound signal Method and apparatus for delaying an ultrasound signal

1985-07-26

1986-12-30

Howell, Kyle L.

Surgery

Truss

Pad

367103, A61B 502

Patent

active

046321241

ABSTRACT:
In medical ultrasonic technology (in particular with phased arrays) it is necessary to delay in time a plurality of received ultrasound signals and subsequently to add them after they are as nearly in phase as possible. The delay times required for this purpose are approximately between 0 and 10 .mu.s. The ultrasound signal is analyzed as to envelope and a sign. The envelope is then delayed either in analog (e.g. with LC delay lines) or digitally (e.g. with shift registers) through a delay means which is adjustable in coarse time steps of e.g. 500 ns. The sign signal corresponding to the sign of the ultrasound signal is delayed via a digital delay section which is adjustable in small time steps of e.g. 50 ns. Phase coherence to other ultrasound signals can be established. Thereafter the delayed sign signal and the delayed envelope signal are multiplied one by the other in a multiplier. Thereafter the output signal is filtered in a low-pass filter. The output from the low-pass filter then represents the delayed form of the ultrasound signal.

REFERENCES:
patent: 3196406 (1965-07-01), Arsem
patent: 4373395 (1983-02-01), Borburgh et al.
patent: 4458533 (1984-07-01), Borburgh

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