Diagnostic Information Inc.

Charles D Robbins

Shih-Ping Wang

Elisha B Merritt

A panel shaped, proximity type, multi-stage x-ray image intensifier tube for medical x-ray diagnostic use having all linear components and yet a high brightness gain, the tube being comprised of a rugged metallic tube envelope, an inwardly concave, metallic input window, a full size output display screen, a planar, activated alkali-halide scintillator photocathode screen, a fiberoptic plate between the scintillator-photocathode screen and the output display screen, the plate having an intermediate display screen on one flat side facing the scintillator-photocathode screen and a second photocathode on the otherside, which faces the output display screen, and with the scintillator-photocathode screen and the fiberoptic plate being suspended on insulators within the envelope and in between the input window and the output screen. Separate, high, negative electrostatic potentials are applied between the scintillator-photocathode screen and the intermediate display screen and between the second photocathode and the output display screen. The tube can be used in a direct view, photofluorographic mode, in a radiographic camera system and with a remote view T.V. system.

Two stage, panel type x-ray image intensifier tube

An Anger gamma ray Camera is improved by the substitution of a gamma ray sensitive, proximity type image intensifier tube for the scintillator screen in the Anger camera, the image intensifier tube having a negatively charged flat scintillator screen and a flat photocathode layer and a grounded, flat output phosphor display screen all of the same dimension (unity image magnification) and all within a grounded metallic tube envelope and having a metallic, inwardly concaved input window between the scintillator screen and the collimator.

Gamma ray camera

A panel shaped, proximity type, x-ray image intensifier tube for medical x-ray fluoroscopy use having all linear components and yet a high brightness gain, in excess of 4,000 cd-sec/m.sup.2 -R, the tube being comprised of a rugged metallic tube envelope, an inwardly concave metallic input window, a directly viewable full size output display screen, and a scintillator-photocathode screen having a thickness of at least 200 microns for a high x-ray photon utilization ability as well as x-ray stopping power, the scintillator-photocathode screen being suspended on insulators within the envelope and in between the input window and the output screen. The scintallator-photocathode screen is spaced from the output screen by at least 8mm to allow the application of a high negative potential at the scintillator-photocathode screen with respect to the output screen for high gain with low field emission, since all of the remaining components within the tube envelope are at neutral potential with respect to the output display screen.

Growing community of inventors

Los Altos Hills, CA, United States of America

Charles D Robbins