Differential interference phase contrast X-ray imaging system
A differential phase-contrast X-ray imaging system is provided. Along the direction of X-ray propagation, the basic components are X-ray tube, filter, object platform, X-ray phase grating, and X-ray detector. The system provides: 1) X-ray beam from parallel-arranged source array with good coherence, high energy, and wider angles of divergence with 30-50 degree. 2) The novel X-ray detector adopted in present invention plays dual roles of conventional analyzer grating and conventional detector. The basic structure of the detector includes a set of parallel-arranged linear array X-ray scintillator screens, optical coupling system, an area array detector or parallel-arranged linear array X-ray photoconductive detector. In this case, relative parameters for scintillator screens or photoconductive detector correspond to phase grating and parallel-arranged line source array, which can provide the coherent X-rays with high energy.
1. A differential interference phase-contrast X-ray imaging system comprising: an X-ray tube comprising parallel arrayed linear X-ray emitters with emission angle of 30-50 degree, which can generate a coherent hard X-ray; an X-ray filter; an object platform; an X-ray phase grating; an X-ray detector with the functions of detection and analysis including parallel arrayed X-ray scintillator screen, light coupling system and visible light area detector or parallel arrayed photoconductive x-ray detector, wherein the X-ray scintillator screen has one dimensional periodicity configured to detect the interferogram of the x-ray phase grating, wherein the X-ray scintillator screen has a periodic structure consisting of a banded X-ray sensitive area and a banded X-ray insensitive area in one periodicity, wherein the insensitive band is perpendicular to the periodic structure is made of material insensitive to X-rays, and the sensitive hand filled by fluorescent material of incident X-ray is divided into rectangle array of pixels by X-ray insensitive material in the direction—perpendicular to the periodic structure, wherein the insensitive material including semiconducting material of silicon, germanium or aluminous metal, stainless steel or glass, and the pixel area is filled with fluorescent material selected from the group consisting of CsI:Tl, CsI:Na or Gd 2 O 2 S:Tb which can emit visible light or near infrared wave when excited by X-ray.
2. A differential interference phase-contrast X-ray imaging system comprising: an X-ray tube comprising parallel arrayed linear X-ray emitters with emission angle of 30-50 degree, which can generate a coherent hard X-ray; an X-ray filter; an object platform; an X-ray phase grating; an X-ray detector with the functions of detection and analysis including parallel arrayed X-ray scintillator screen, light coupling system and visible light area detector or parallel arrayed photoconductive x-ray detector, wherein the X-ray scintillator screen has one dimensional periodicity configured to detect the interferogram of the x-ray phase grating, wherein the X-ray scintillator screen has a periodic structure consisting of a banded X-ray sensitive area and a banded X-ray insensitive area in one periodicity, wherein the insensitive band is perpendicular to the periodic structure is made of material insensitive to X-rays, and the sensitive band filled by fluorescent material of incident X-ray is divided into rectangle array of pixels by X-ray insensitive material in the direction—perpendicular to the periodic structure, wherein the visible light coupling system consists of optical fiber taper, optical fiber plate or optical lens or composite of optical fiber taper, optical fiber plate.