title: Measurement of the effective size of the input phosphor of an x-ray image intensifier.
abstract: A technique is described, using a mobile radiographic x-ray unit, for determining the effective size of the input phosphor of an image intensifier (I.I.), in particular for a unit with over-table x-ray tube, under-table II, and with the I.I. physically inaccessible. The techniques described also enable (1) locating the central axis of the I.I.; (2) the ratio, R, of the dimensions of the radiological image incident upon the front of the I.I. to the dimensions of the image on the monitor screen; and (3) the distance between the input phosphor and the table top, which is needed to determine the distance from focal spot to input phosphor.
authors.affiliation: Methodist Medical Center of Illinois, Peoria 61636, USA.
authors.forename: A
authors.initials: A
authors.lastname: Feldman
authors.forename: R
authors.initials: R
authors.lastname: Cox
authors.forename: J
authors.initials: J
authors.lastname: Rosser
mesh_terms: D055592:Biophysical Phenomena; D001703:Biophysics; D005069:Evaluation Studies as Topic; D006801:Humans; D008163:Luminescent Measurements; D013679:Technology, Radiologic / Q000295:instrumentation; D014963:X-Ray Intensifying Screens