Ultrasonic imaging by contacting a catalytic element...

Details Ultrasonic imaging by contacting a catalytic element... Ultrasonic imaging by contacting a catalytic element...

G - Physics

03

C

96/1, 96/222, 34

G03C 5/04 (2006.01) G01H 3/10 (2006.01)

Patent

CA 1136468

-0- ULTRASONIC IMAGING WITH CATALYTIC ELEMENTS Abstract Or the Disclosure A process is disclosed for producing an ultra- sonographic image using an element containing a catalyst and a diffusion barrier. When the element is placed into contact with a solution containing a catalyst poison and ultrasound is imagewise applied, the catalyst is selec- tively poisoned in ultrasonically exposed areas. There- after the unpoisoned catalyst remaining is employed to form a viewable image. The catalyst can be electrically biased to avoid poisoning during extended contact with the catalyst poisoning solution in the absence of ultrasound. In one form the catalyst can be generated using a photo- graphic silver halide emulsion.

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