Abstract: 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.

Abstract: 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.

Abstract: 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.