title: [Preface for "the frontiers of three/four dimensional radiological technology"].
authors.forename: Katsuhiro
authors.initials: K
authors.lastname: Ichikawa
mesh_terms: D003952:Diagnostic Imaging / Q000639:trends*; D056973:Four-Dimensional Computed Tomography / Q000379:methods / Q000639:trends; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods / Q000639:trends*; D019047:Phantoms, Imaging; D013679:Technology, Radiologic / Q000379:methods* / Q000639:trends*