Abstract

The spatial resolution of an x-ray CCD detector was determined from the widths of the tungsten x-ray lines in the spectrum formed by a crystal spectrometer in the 58 to $70\mathrm{keV}$ energy range. The detector had $20\mathrm{\mu m}$ pixel, 1700 by 1200 pixel format, and a CsI x-ray conversion scintillator. The spectral lines from a megavolt x-ray generator were focused on the spectrometer’s Rowland circle by a curved transmission crystal. The line shapes were Lorentzian with an average width after removal of the natural and instrumental line widths of $95\mathrm{\mu m}$ (4.75 pixels). A high spatial frequency background, primarily resulting from scattered gamma rays, was removed from the spectral image by Fourier analysis. The spectral lines, having low spatial frequency in the direction perpendicular to the dispersion, were enhanced by partially removing the Lorentzian line shape and by fitting Lorentzian curves to broad unresolved spectral features. This demonstrates the ability to improve the spectral resolution of hard x-ray spectra that are recorded by a CCD detector with well-characterized intrinsic spatial resolution.

© 2010 Optical Society of America

X-ray modulation transfer functions of photostimulable phosphor image plates and scanners

John F. Seely, Glenn E. Holland, Lawrence T. Hudson, and Albert Henins
Appl. Opt. 47(31) 5753-5761 (2008)

Characterization of a CCD-based digital x-ray imaging system for small-animal studies: properties of spatial resolution

Fabrice Ouandji, Eric Potter, Wei R. Chen, Yuhua Li, David Tang, and Hong Liu
Appl. Opt. 41(13) 2420-2427 (2002)

Enhanced x-ray resolving power achieved behind the focal circles of Cauchois spectrometers

John F. Seely, Lawrence T. Hudson, Glenn E. Holland, and Albert Henins
Appl. Opt. 47(15) 2767-2778 (2008)

Development of microperiodic mirrors for hard x-ray phase-contrast imaging

Dan Stutman, Michael Finkenthal, and Nicolae Moldovan
Appl. Opt. 49(25) 4677-4686 (2010)

Supermirror hard-x-ray telescope

Koujun Yamashita, Peter J. Serlemitsos, Jack Tueller, Scott D. Barthelmy, Lyle M. Bartlett, Kai-Wing Chan, Akihiro Furuzawa, Neil Gehrels, Kazutoshi Haga, Hideyo Kunieda, Peter Kurczynski, Gyanendra Lodha, Norio Nakajo, Norihiko Nakamura, Yoshiharu Namba, Yasushi Ogasaka, Takashi Okajima, David Palmer, Ann Parsons, Yang Soong, Carl M. Stahl, Harumi Takata, Keisuke Tamura, Yuzuru Tawara, and Bonnard J. Teegarden
Appl. Opt. 37(34) 8067-8073 (1998)