Lee M Marsh

Author:

Lee Marsh

ISBN #:

0738512672

Author:

Lee Marsh

ISBN #:

0752409476

US Patent:

45395918, Sep 3, 1985

Filed:

May 14, 1979

Appl. No.:

6/038831

Inventors:

Alfonso Zermeno - Houston TX
Lee M. Marsh - Houston TX
Ronald W. Cowart - Houston TX

Assignee:

University of Texas System - Austin TX

International Classification:

H04N 530
H04N 576
H01J 3150

US Classification:

358335

Abstract:

A method of recording and reading out a latent image which comprises placing a uniform surface charge on the photoconductive layer of a multilayered detector apparatus, biasing said photoconductive layer with an electric field whose polarity opposes said surface charge, discharging some portion of said surface charge of said photoconductive layer by exposing said detector to a modulated radiation flux capable of generating electron hole pairs in the photoconductor; scanning the surface of said partially discharged photoconductive layer with a small diameter photon beam whereby said surface charge is sequentially further discharged, and measuring the changing electric current of said sequential further discharge as a function of time.

US Patent:

40853241, Apr 18, 1978

Filed:

Jan 4, 1977

Appl. No.:

5/756634

Inventors:

Alfonso Zermeno - Houston TX
Lee M. Marsh - Houston TX
James M. Hevezi - Houston TX

Assignee:

The University of Texas - Houston TX

International Classification:

G03B 517

US Classification:

250320

Abstract:

Radiation is partially blocked by a pointlike absorber to establish a patterned flux whose intensity distribution is a function of source geometry. The flux strikes a receptor having a proper contrast to spatial frequency characteristic to map an image that is topologically equivalent to the source at an acceptable level of contrast and acuity. Apparatus is disclosed that is capable of practicing the invention in the X-ray and light regions of the electromagnetic spectrum.

US Patent:

45218080, Jun 4, 1985

Filed:

Jul 6, 1981

Appl. No.:

6/280611

Inventors:

Poen S. Ong - Houston TX
Alfonso Zermeno - Houston TX
Lee M. Marsh - Houston TX
James M. Hevezi - Rapid City SD
Ronald W. Cowart - Houston TX

Assignee:

University of Texas System - Austin TX

International Classification:

H04N 308

US Classification:

358111

Abstract:

An image scanning apparatus for obtaining radiographic information from a detector system. The apparatus produces a video signal by optical readout of a latent image found in a detector system. The video signal is processed and displayed to provide radiographic information.

US Patent:

47630027, Aug 9, 1988

Filed:

May 14, 1979

Appl. No.:

6/038465

Inventors:

Alfonso Zermeno - Houston TX
Lee M. Marsh - Houston TX

Assignee:

University of Texas System - Austin TX

International Classification:

G01T 122

US Classification:

25037001

Abstract:

A multilayered detector apparatus comprising: a first conductive layer: a photoconductive layer having two sides thick enough to obtain a desired level of sensitivity and resolution of the detector apparatus when the detector apparatus is exposed to radiation of known energy, one side of said photoconductive layer being integrally affixed to and in electrical contact with one side of said first conductive layer; a insulating layer having two sides that is a phosphor that will emit light when irradiated by X-rays, one side of said insulating layer being affixed to the other side of said photoconductive layer; and transparent conductive layer having two sides, one side of said transparent conductive layer being affixed to the other side of said insulating layer.

US Patent:

44463650, May 1, 1984

Filed:

Jul 6, 1981

Appl. No.:

6/280401

Inventors:

Poen S. Ong - Houston TX
Alfonso Zermeno - Houston TX
Lee M. Marsh - Houston TX
James M. Hevezi - Tuscon SD

Assignee:

University of Texas System - Austin TX

International Classification:

H01J 3150

US Classification:

250213R

Abstract:

A method of operating a photodetector system. The method impresses a surface charge on a photon detector by establishing an electric potential across the detector, storing the detector in the dark, disconnecting the source of electric potential, and electrically connecting layers in the detector.