ULTRASONOGRAPHIC ELEMENTS CONTAINING DIFFUSABLE ION LAYER, BARRIER LAYER AND LAYER FOR IMMOBILIZING DIFFUSIBLE ION

摘要

ULTRASONOGRAPHIC ELEMENTS CONTAINING MULTIPLE LAYERS AND PROCESSES FOR THEIR USE Or the Disclosure An ultrasonographic element is disclosed comprised Or first and second layers coated on a support, at least one of the layers being a silver halide emulsion layer. One of the layers contains a diffusible ion capable of altering the sensitivity of a silver halide emulsion while the other layer is capable of immobilizing the diffusible ion. Interposed between the layers is a barrier for impeding diffusion of the sensitivity altering ion in the absence of ultrasound. An ultrasonographic image is formed by contacting the element with a transport liquid, ultrasonically exposing the element imagewise to accelerate diffusion of the sensi tivity altering ion between the layers, exposing the element to electromagnetic radiation and photographically processing the element to produce an image corresponding to the image pattern of ultrasonic exposure.