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Absorption and noise in cesium iodide x‐ray image intensifiers
Author(s) -
Rowlands J. A.,
Taylor K. W.
Publication year - 1983
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 - 10.1118/1.595357
Subject(s) - image intensifier , detective quantum efficiency , electron , physics , optics , x ray , phosphor , absorption (acoustics) , atomic physics , nuclear physics , image (mathematics) , image quality , artificial intelligence , computer science
The measured and theoretically predicted values of detective quantum efficiency (DQE) for a CsI x‐ray image intensifier are compared for nine monoenergetic beams of x rays. The agreement between measurement and theory of better than ±5% indicates that we have a sound understanding of the physical parameters controlling the DQE. It is shown that the fraction of K ‐fluorescent x rays escaping from the input phosphor is independent of incident energy. The number of electrons released within the x‐ray image intensifier (XRII) by an incident x ray has been measured. The mechanism for energy broadening within the XRII is shown to be predominantly the limited number of electrons and not light absorption.