| 摘要 |
<p>The invention concerns the preparation of ultrasonographic images. …<??>The process uses an element containing an imaging catalyst and a diffusion barrier. A dye-image generating material can be included in the catalytic element in order to obtain a dye image. The element is placed into contact with a solution containing a catalyst poison and is exposed to ultrasound in an image pattern. The catalyst is selectively poisoned in ultrasonically exposed areas. The remaining unpoisoned catalyst is employed to form a viewable image. The curves give the cyan dye density against ultrasound exposure in mW.s/cm<2>. Curves 1 and 2 correspond to elements placed in the catalyst poison bath respectively for 20 s and 5s before an ultrasonic exposure. …<??>Ultrasonographic process carried out under ordinary room lighting conditions.</p> |
