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KMID : 1151820150090040205
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Journal of the Korean Society of Radiology
2015 Volume.9 No. 4 p.205 ~ p.211
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Acquisition of Monochromatic X-ray using Graded Multilayer Mirror
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Ryu Cheol-Woo
Choi Byoung-Jung
Son Hyun-Hwa
Kwon Young-Man
Kim Byoung-Wook
Kim Young-Ju
Chon Kwon-Su
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Abstract
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At a recent medical imaging technology, the major issue of X-ray diagnosis in breast cancer is the early detection of breast cancer and low patient's exposure dose. As one of studies to acquire a monochromatic X-ray, Technologies using multilayer mirror had been preceded. However, a uniform multilayer mirror that consists of uniform thin-film thickness can acquire a monochromatic X-ray only in the partial area corresponds to angle of incidence of white X-ray, so there are limits for X-ray imaging technology applications. In this study, we designed laterally graded multilayer mirror(below GML) that reflects same monochromatic X-ray over the entire area of thin-film mirror, which have the the thickness of the linear gradient that correspond to angle of incidence of white X-ray. By using ion-beam sputtering system added the mask control system we fabricated a GML which has size of 100×100mm². The GML is designed to achieve the monochromatic X-ray of 17.5kev energy and has thin-film thickness change from 4.62nm to 6.57nm(3.87nm at center). It reflects the monochromatic X-ray with reflectivity of more than 60 percent, FWHM of below 2.6keV and X-ray beam width of about 3mm. The monochromatic X-ray corresponded to 17.5keV using GML would have wide application in development of mammography system with high contrast and low dose.
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KEYWORD
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Monochromatic X-ray, Graded multilayer mirror, Characteristic X-ray, X-ray reflectivity, X-ray monochromaticity, Ion-beam sputtering
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