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Thanhhai Nguyen(뉴엔탄하이),Kiyoung Kim(김기영),Daniel Vavrik,Insu Jeon(전인수) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
In this paper, design of parabolic optical multimirrors using the depth-graded multilayer coatings has been proposed to create a broad band of parallel X-ray beam by the total external reflection. A coupled W/Al bilayer with gradually changed thickness can be used in order to increase not only the incidence angles but also the intensity of the output parallel beam. The maximum length of mirrors can be designed lower than 4 inch due to the limitation of facilities. The thickness 5.25 ㎜ of the parallel beam was obtained using five parabolic mirrors located at the position of 1200 ㎜ far from the X-ray source at the wavelength of 0.2289㎚
Effect of the X-ray shooting angles for 2-D images on CT images
Tao Quang Bang(다어 광 팡),Daniel Vavrik,Insu Jeon(전인수) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In this paper, a new method for the exact reconstruction of any gray-scale image from its projections is proposed. The original X-ray image is projected into several view shooting angles and then 2-D images will be reconstructed to CT images using Matlab software. The main aim of this study was to evaluate the effect of the X-ray shooting angles for 2-D images on CT images and another objective of this study was to obtain 2D X-ray images of CT reconstruction with ordered subsets expectation-maximization (OSEM) method.