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Proceedings Paper

Quasi-monochromatic x-ray filter with thin film multilayer for a large area radiation field
Author(s): Youngsei Park; Sejin Han; Jangyeol Chae; Changkyu Kim; Kwon S. Chon; Hyoung-Koo Lee; D. S. Han
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Paper Abstract

We fabricated an X-ray beam filter housing which can acquire large-area 2-dimensional images with a designated narrow band X-ray energy which was generated from the wide energy spectrum of the X-ray beam. The filter housing consists of an array of reflectors and each reflector filters the input X-ray energy from an ordinary X-ray tube and passes an X-ray beam of quasi-monochromatic energy. With a precise alignment of the whole reflectors in the filter housing device it is possible to make the total quasi-monochromatic X-ray beams cover a large area for imaging. The substrate of the reflector itself absorbs some of X-ray photons, which generates shadow of the layers on the image. In order to solve this problem the system was made to rotate around the focal spot of the X-ray tube during the X-ray image acquisition, which resembles the motion of a searchlight, hence there is no blind spot to the X-ray beam. At a preliminary stage we obtained images for a short exposure time of less than 1 second. Representative spectra and full field CDMAM phantom image of 197 mm × 238 mm acquired from the filter housing rotation method are presented. And the advantage of the monochromatic X-ray against the conventional polychromatic X-ray in terms of contrast is investigated.

Paper Details

Date Published: 13 March 2009
PDF: 9 pages
Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72583L (13 March 2009); doi: 10.1117/12.811537
Show Author Affiliations
Youngsei Park, Hanwha L&C Research Ctr. (Korea, Republic of)
Sejin Han, Hanwha L&C Research Ctr. (Korea, Republic of)
Jangyeol Chae, Hanwha L&C Research Ctr. (Korea, Republic of)
Changkyu Kim, Hanwha L&C Research Ctr. (Korea, Republic of)
Kwon S. Chon, Wonkwang Univ. (Korea, Republic of)
Hyoung-Koo Lee, College of Medicine,The Catholic Univ. of Korea (Korea, Republic of)
D. S. Han, Monoray Co., Ltd (Korea, Republic of)

Published in SPIE Proceedings Vol. 7258:
Medical Imaging 2009: Physics of Medical Imaging
Ehsan Samei; Jiang Hsieh, Editor(s)

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