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.