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X‐ray imaging using amorphous selenium: Inherent spatial resolution
Author(s) -
Que W.,
Rowlands J. A.
Publication year - 1995
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 - 10.1118/1.597471
Subject(s) - image resolution , optics , resolution (logic) , optical transfer function , photoelectric effect , x ray , photon , physics , materials science , computer science , artificial intelligence
This is a theoretical study of the inherent spatial resolution of the latent image on the surface of an amorphous selenium ( a ‐Se) plate used for diagnostic x‐ray imaging. The following effects are considered: (A) ranges of primary photoelectrons; (B) reabsorption of K fluorescence; (C) reabsorption of Compton scattered photons; (D) diffusion; (E) the geometric effect due to oblique incidence of x rays; (F) electrostatic effect; and (G) the space charge effect. The modulation transfer function of a ‐Se in the diagnostic x‐ray energy range has been estimated. In conclusion, (A) and (E) are the main factors limiting the resolution, and for diagnostic x rays, the inherent spatial resolution of a ‐Se plates is much better than that of CsI layers used in x‐ray image intensifiers.