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Proceedings Paper

Laser Readout Of Electrostatic Images
Author(s): Alfonso Zermeno; Thomas Kirby; Ronald Cowart; Lee Marsh; Poen Ong
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Paper Abstract

An electrostatic radiographic receptor has been designed that allows the latent image resulting from an x-ray exposure to be reconstructed by means of a scanning laser beam. The receptor can be described as a duodielectric device making use of amorphous selenium as one of the dielectric components. The second dielectric component is a polyester sheet with a transparent gold coating on one side. Charges may be trapped at the surface of the selenium by placing an electric field across the structure while exposing it to light. A technique is described in which either subsequent polarity reversal or placing a short-circuit across the structure isolates these charges. Exposure to x-ray at this point selectively discharges the selenium surface, thus creating an electrostatic image. Further exposure of the system to a scanning light source produces a displacement current as the structure is totally discharged element by element. The resulting video signal is used to generate images of the charge pattern.

Paper Details

Date Published: 6 July 1979
PDF: 7 pages
Proc. SPIE 0173, Application of Optical Instrumentation in Medicine VII, (6 July 1979); doi: 10.1117/12.957128
Show Author Affiliations
Alfonso Zermeno, The University of Texas System Cancer Center (United States)
Thomas Kirby, The University of Texas System Cancer Center (United States)
Ronald Cowart, The University of Texas System Cancer Center (United States)
Lee Marsh, The University of Texas System Cancer Center (United States)
Poen Ong, The University of Texas System Cancer Center (United States)


Published in SPIE Proceedings Vol. 0173:
Application of Optical Instrumentation in Medicine VII
Joel E. Gray, Editor(s)

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