A Thomson scattering X-ray source can produce quasi-monochromatic and continuously energy-tunable X-rays characterized by small focal spot and high brightness, which makes it an excellent light source for K-edge imaging. In this paper, the experimental feasibility of K-edge imaging was demonstrated at the Tsinghua Thomson scattering X-ray source (TTX). The phantom was a plastic test tube filled with sodium iodide (NaI)- loaded water solutions with I concentrations ranging from 5 to 300 mg/ml. Well agreement between the measured equivalent projection integral of the linear attenuation coefficient of the phantom and the theoretically predicted value was witnessed. The influence of X-ray bandwidth on the image quality was discussed. Based on the continuous tunability of scattered X-ray energy, the K-edge subtraction imaging was tested and obvious contrast enhancement was achieved. Our results pave the way towards practical application of K-edge imaging at the TTX.
Based on the collision of intense laser and relativistic electrons, a Thomson scattering x-ray source can produce quasi-monochromatic x-ray pulses with high brightness in the tens keV or even higher energy regime, which can eliminate the beam hardening effect encountered in computed tomography (CT) by using polychromatic x-rays generated through Bremsstrahlung and make it possible to relate the reconstructed linear attenuation coefficients to the composition of a material. In this paper, we demonstrate the capacity of quantitative CT measurement based on Tsinghua Thomson scattering X-ray source (TTX) and the potential of anatomical segmentation using quantitative linear attenuation coefficient analysis. A peanut sample (Arachis hypogaea L.) was chosen for this study. According to the reconstructed CT image, all anatomical structures except for the testa (i.e. the seed coat) of peanut were identified clearly in terms of the shape and size, and there were high similarities between reconstructed linear attenuation coefficients of cotyledon and its theoretical values. After quantitative analysis of the reconstructed linear attenuation coefficients, the hull can be peeled off the core at the threshold of 0.31 cm-1. Our results pave the way towards fundamental researches and practical applications based on quantitative CT at TTX.
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