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Producing parallel x rays with a bent‐crystal monochromator and an x‐ray tube
Author(s) -
Zhong Z.,
Dilmanian F. A.,
Bacarian T.,
Zhong N.,
Chapman D.,
Ren B.,
Wu X. Y.,
Weinmann H.J.
Publication year - 2001
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 - 10.1118/1.1395024
Subject(s) - monochromator , optics , beam (structure) , bent molecular geometry , x ray tube , perpendicular , photon energy , beam diameter , physics , photon , x ray , materials science , anode , geometry , laser , electrode , quantum mechanics , wavelength , mathematics , laser beams , composite material
A bent Laue monochromator and a conventional x‐ray tube were used to produce a fan beam that was parallel in the plane perpendicular to the plane of the fan. The x‐ray fan beam was tunable in energy and had about 12% energy bandwidth at a slice height of 5 mm when tuned to 50 keV. The beam's energy was slightly coupled to the vertical position on the beam's height. The slice height could be varied from 1 to 10 mm. The flux at 50 keV was approximately2 × 10 6photons/mm 2 /s with a rotating anode tungsten x‐ray tube operating at 120 kVp and 100 mA. The narrow energy bandwidth of the beam produced is advantageous over a conventional divergent polychromatic beam for all radiography applications, while the parallelism of the beam enhances its intensity by about threefold and offers some advantages for computed tomography.