Beam former for ultrasonic diagnostic apparatus

Details Beam former for ultrasonic diagnostic apparatus Beam former for ultrasonic diagnostic apparatus

1992-11-16

1993-11-23

Jaworski, Francis

Surgery

Truss

Pad

12866101, 367103, 367105, A61B 800

Patent

active

052634833

ABSTRACT:
A beam former for a ultrasonic diagnostic apparatus is arranged to have low-bit analog-to-digital converters and enables to obtain an excellent echo signal from blood flow. The beam former further includes a sample and hold circuit for sampling an echo signal of a pulse reflected from the inside of a human body. A delaying circuit serves to delay the output of the sample and hold circuit by a delay time corresponding to an integer multiple of a transmitted pulse period and is subtracted from the output of the sample and hold circuit. The subtracted output is analog-to-digital converted and is stored in a memory. The memory reads out the data asynchronously with the storage. The delaying circuit is composed of an analog-to-digital converter, a memory and a digital-to-analog converter and has a delay time corresponding to an integer multiple of the transmitted pulse period.

REFERENCES:
patent: 4318413 (1982-03-01), Iinuma et al.
patent: 4492235 (1985-01-01), Sitrick
patent: 4841491 (1989-06-01), Kondo et al.
patent: 5197477 (1993-03-01), Peterson et al.
Dan E. Dudgeon, "Fundamentals of Digital Array Processing", Proceedings of the IEEE, vol. 65, No. 6, Jun. 1977, pp. 898-904.
R. Fehr, "A New MTI Structure with Inherent Analog to Digital Conversion", Circuit Theory and Design 1978, pp. 528-532.

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