X-ray sensitive video camera

摘要

Abstract: By converting the absorbed X-ray image directly to an electrical video signal, the x-ray sensitive video camera offers improved resolution and reduced veiling glare over a conventional x-ray image intensifier for medical fluoroscopy. Unfortunately, currently available x-ray sensitive video cameras are limited to a 1' field of view and poor quantum efficiency. We are developing an x-ray sensitive vidicon for medical use which will have a large field of view (5' or more) and a thicker amorphous selenium target with a quantum efficiency $GRT@70%. Due to the larger potential required to bias the thicker a-Se target a problem in maintaining a stable surface potential by means of a scanning electron beam is encountered. This stability problem is overcome by the addition of a suppressor mesh.!22