title: Null functions and eigenfunctions: tools for the analysis of imaging systems.
authors.affiliation: Department of Radiology, University of Arizona, Tucson 85724.
authors.forename: H H
authors.initials: HH
authors.lastname: Barrett
authors.forename: J N
authors.initials: JN
authors.lastname: Aarsvold
authors.forename: T J
authors.initials: TJ
authors.lastname: Roney
mesh_terms: D003952:Diagnostic Imaging; D008433:Mathematics; D015233:Models, Statistical