Patent ID: 7068749
Filing Date: 2006-06-27
Classification: A61B,H01J

Abstract:
1. A stationary CT system comprising: at least one annular x ray source assembly comprising a plurality of respective x ray sources spaced along said annular x ray source assembly, wherein each of said respective x ray sources comprises a respective stationary x ray target; an electron beam focusing chamber; an x ray channel; and an electron beam source disposed in a spaced apart relationship with respect to said respective stationary x ray target, and wherein said electron beam focusing chamber comprises a top section and a bottom section disposed in a spaced relationship to one another so as to have a selected cross-sectional profile so as to focus a plurality of electrons emitted from said electron beam source to impinge on said respective stationary x ray target to produce x rays that pass into said x ray channel, the top section further being configured to receive back-scattered electrons generated by the electron beam impact at the respective stationary x ray target and predominantly redirect the back-scattered electrons away from said electron beam source, wherein said top section of said electron beam focusing chamber comprises a plurality of grooves located opposite said respective stationary x ray target to trap a plurality of back-scattered electrons and prevent said plurality of back-scattered electrons from hitting said respective stationary x ray target.