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Measurement of the effective size of the input phosphor of an x‐ray image intensifier
Author(s) -
Feldman Arnold,
Cox Ronald,
Rosser Jeffrey
Publication year - 1997
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.597972
Subject(s) - image intensifier , phosphor , optics , table (database) , radiography , computed radiography , x ray tube , physics , x ray , computer science , nuclear medicine , image (mathematics) , image quality , computer vision , optoelectronics , anode , nuclear physics , medicine , electrode , quantum mechanics , data mining
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.