Abstract

Info

Title:: Micro-focus in-line X-ray phase contrast imaging experiment and phase recovery reconstruction

Author(s):: ZHANG Xiajing1; XIA Tian2; HE Peizhong3; 1. School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; 2. Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai 200062, China; 3. Shanghai University of Medicine & Health Sciences, Shanghai 201318, China

Keywords:: Keywords: X-ray; phase contrast imaging; micro-focus; edge enhancement; phase extraction

Abstract:: Abstract: Objective To perform phase contrast imaging experiment and phase information extraction based on micro-focus Xray source. Methods Based on Fresnel-Kirchhoff diffraction theory and considering the effects of spatial coherence and temporal coherence, the general formula of continuous X-ray phase contrast imaging was derived. According to the method of extracting pure phase information from the images containing phase information and absorption information, the phase contrast images were processed with MATLAB. Results In experiment 1, phase contrast imaging was conducted on a plastic straw. By changing the distance between the detector and the sample, the images which were clearer and larger than those obtained by traditional X-ray imaging and highlighted the boundary information were obtained. In experiment 2, the phase contrast images of borosilicate glass at tube voltage of 45 kVp and 70 kVp were obtained and then the phase contrast images containing pure phase information were obtained through phase recovery reconstruction. Conclusion For light elements, micro-focus in-line X-ray phase contrast imaging is superior to traditional X-ray phase contrast imaging in image resolution and image contrast. The technology of phase information extraction will greatly promote the applications of X-ray phase contrast imaging in general laboratory and clinical tumor detection.