Ultrasound examination apparatus comprising a mosaic of transduc

Details Ultrasound examination apparatus comprising a mosaic of transduc Ultrasound examination apparatus comprising a mosaic of transduc

1981-03-20

1983-03-01

Birmiel, Howard A.

Measuring and testing

Vibration

By mechanical waves

73631, 73900, 310315, 310368, 367900, G01N 2900

Patent

active

043751660

ABSTRACT:
An ultrasound examination apparatus comprises a processing circuit for echo signals from a mosaic of ultrasonic transducers which are made of an electrostrictive material with a non-remanent polarization. These signals are applied to processing channels which comprise coupling means (10i) for coupling the electrodes of the transducers to a circuit (20) for generating a polarization voltage ramp whose waveform is the inverse of that of the attenuation curve of the ultrasonic signals in the structures examined. These coupling means, for example, an RC circuit (11i, 12i) or a transformer (13i) enable the polarization voltage to be applied to the electrodes while inhibiting the transmission to the part of the processing channels which is situated behind the coupling means.

REFERENCES:
patent: 2928068 (1960-03-01), Samsel et al.
patent: 2956184 (1960-10-01), Pollack
patent: 4016862 (1977-04-01), Lancee et al.
patent: 4205555 (1980-06-01), Hashiguchi

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