Design and analysis of X-ray digital tomosynthesis system

X-ray digital tomosynthesis (DT) that can form a cross-sectional image of 3D objects promise to be good solutions for inspecting interior or occluded defects of industrial products. We propose an X-ray DT system consisting of a scanning X-ray tube, an image intensifier, a rotating prism and a CCD camera. System parameters such as geometric magnification and X-ray projection angle can be the main factors to be considered to design the system. In achieving larger magnification and production angle together, there are restrictions due to geometric limitations. The parametric relations are investigated based on a numerical model of the system. A method to correct distorted images in intensity and shape as well is proposed. It uses a polynomial model from a known reference grid pattern. It uses a self-organizing feature mapping (SOFM) network. As an application, a series of experimental images of PCB boards is considered.