title: The Mccallum degassing system for the head box of the E.M.I. (C.T. 1000) brain scanner.
mesh_terms: D001921:Brain / Q000000981:diagnostic imaging*; D005740:Gases; D006801:Humans; D014057:Tomography, X-Ray Computed / Q000295:instrumentation*
chemical_list: D005740:Gases