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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 4, Iss. 9 — Sep. 4, 2009

A low-absorption x-ray energy filter for small-scale applications

Erik Fredenberg, Björn Cederström, Peter Nillius, Carolina Ribbing, Staffan Karlsson, and Mats Danielsson  »View Author Affiliations

Optics Express, Vol. 17, Issue 14, pp. 11388-11398 (2009)

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We present an experimental and theoretical evaluation of an x-ray energy filter based on the chromatic properties of a prism-array lens (PAL). It is intended for small-scale applications such as medical imaging. The PAL approximates a Fresnel lens and allows for high efficiency compared to filters based on ordinary refractive lenses, however at the cost of a lower energy resolution. Geometrical optics was found to provide a good approximation for the performance of a flawless lens, but a field-propagation model was used for quantitative predictions. The model predicted a 0.29 ΔE/E energy resolution and an intensity gain of 6.5 for a silicon PAL at 23.5 keV. Measurements with an x-ray tube showed good agreement with the model in energy resolution and peak energy, but a blurred focal line contributed to a 29% gain reduction. We believe the blurring to be caused mainly by lens imperfections, in particular at the periphery of the lens.

© 2009 Optical Society of America

OCIS Codes
(120.2440) Instrumentation, measurement, and metrology : Filters
(170.7440) Medical optics and biotechnology : X-ray imaging
(340.0340) X-ray optics : X-ray optics
(350.5610) Other areas of optics : Radiation
(050.1965) Diffraction and gratings : Diffractive lenses
(070.7345) Fourier optics and signal processing : Wave propagation

ToC Category:
X-ray Optics

Original Manuscript: March 19, 2009
Revised Manuscript: May 15, 2009
Manuscript Accepted: June 10, 2009
Published: June 23, 2009

Virtual Issues
Vol. 4, Iss. 9 Virtual Journal for Biomedical Optics

Erik Fredenberg, Björn Cederström, Peter Nillius, Carolina Ribbing, Staffan Karlsson, and Mats Danielsson, "A low-absorption x-ray energy filter for small-scale applications," Opt. Express 17, 11388-11398 (2009)

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