Study Of X-ray Imaging Based On Line Focus Source

X-ray imaging technology is increasingly important in today's medical tests, industrial production and scientific research. Traditional X-ray imaging technique is based on the absorption of X-rays and physical imaging, treatment object composed of soft matter can not be effectively detected. In recent years, based on the study of the phase information detected by X-ray phase contrast imaging is becoming popular. Compared with the conventional X-ray imaging techniques, X-ray phase contrast imaging can provide higher sensitivity. Thus, X-ray phase contrast imaging is increasingly used in the fields of medicine, biology and materials science. X-ray phase contrast imaging method is mainly divided into four categories: category Zernike phase contrast imaging, diffraction enhanced law, and coaxial interference method. Class Zernike phase contrast imaging apply to microscopic imaging, the higher the light source and the imaging system device requirements. Coherent diffraction enhanced high requirements on time, so you must use the synchrotron radiation source, is not conducive to the more practical application, line phase contrast imaging method is simple, time requirements for low coherence light source, but has a higher spatial coherence requirements, and because the detected light intensity is actually the second-order differential object phase, so the detector requirements are relatively high. Coherence interferometry imaging requires time high, but based on the phase contrast imaging grating since it is possible to obtain good imaging results under laboratory conditions, no strict monochromatic, and over a large field of view imaging, and good mechanical stability.Line phase contrast imaging demanding coherence time of the light source, the first-line phase contrast imaging is proposed to be done under the conditions of synchronous radiation experiments. And it does not ask for its coherence time of the light source, so it can under laboratory conditions using micro-focus source imaging study. In this paper, the theoretical line phase contrast imaging studied theoretically, affect the image obtained in the theory of coaxial plane wave and spherical wave radiation phase contrast imaging, as well as discuss the spatial coherence and temporal coherence of the line phase contrast imaging. Under laboratory conditions existing for different items were line phase contrast imaging experiments, imaging analysis and comparison. Line source for good coherence properties of space only in one direction, the imaging conditions online source image reconstruction to study proposed two approaches: overlap and CT image reconstruction. Can effectively source a directional line good spatial coherence extends to all directions of the imaging. Two methods were simulated to prove the effectiveness of these two methods.