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A variable resolution x‐ray detector for computed tomography: I. Theoretical basis and experimental verification
Author(s) -
DiBianca F. A.,
Gupta V.,
Zeman H. D.
Publication year - 2000
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 - 10.1118/1.1287510
Subject(s) - detector , optical transfer function , resolution (logic) , optics , image resolution , physics , tomography , medical imaging , computer science , artificial intelligence
A computed tomography imaging technique called variable resolution x‐ray (VRX) detection provides detector resolution ranging from that of clinical body scanning to that of microscopy (1 cy/mm to 100 cy/mm). The VRX detection technique is based on a new principle denoted as “projective compression” that allows the detector resolution element to scale proportionally to the image field size. Two classes of VRX detector geometry are considered. Theoretical aspects related to x‐ray physics and data sampling are presented. Measured resolution parameters (line‐spread function and modulation‐transfer function) are presented and discussed. A VRX image that resolves a pair of 50μ tungsten hairs spaced 30μ apart is shown.