Dr. Youngsei Park Profile

Dr. Youngsei Park

at HANWHA L & C Corp

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Proceedings Article | 14 March 2009 Paper

Quasi-monochromatic x-ray filter with thin film multilayer for a large area radiation field

Youngsei Park, Sejin Han, Jangyeol Chae, Changkyu Kim, Kwon Chon, Hyoung-Koo Lee, D. Han

Proceedings Volume 7258, 72583L (2009) https://doi.org/10.1117/12.811537

KEYWORDS: X-rays, Reflectors, X-ray imaging, Polymethylmethacrylate, Optical filters, Aluminum, Thin films, Image filtering, Multilayers, X-ray sources

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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.

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