A kind of X-ray grating phase-contrast imaging device and imaging method

Abstract

The invention discloses an X-ray optical grating phase-contrast imaging device and method. The X-ray optical grating phase-contrast imaging device comprises an X-ray tube (11), a source optical grating (12), a sample table (4), a beam splitting optical grating (13), an analysis optical grating (15) and an X-ray detector (16), wherein the centers of the parts are coaxial in the horizontal direction, the substrate faces of the source optical grating (12), the beam splitting optical grating (13) and the analysis optical grating (15) rightly face the X-ray tube (11). The placement directions of the three optical gratings are turned, a part of energy deposition borne by the absorbing portion absorbing periodic structures of the optical gratings in a traditional method is transferred to the substrate portions without change of existing correction step, acquisition method and information separation method, so that irradiation dose, energy deposition and heat distribution exerted to the substrates are more uniform, heat distribution vibration or even deformation brought by corresponding heat effects is reduced, the stability of a system is improved, and the service life of the optical gratings is prolonged.

Description

technical field [0001] The invention relates to the field of X-ray grating phase-contrast imaging, in particular to an X-ray grating phase-contrast imaging device and an imaging method. Background technique [0002] Compared with the traditional absorption-based imaging method, the X-ray phase contrast imaging method has attracted extensive attention since it was proposed because of its obvious advantages for low atomic number substances such as human soft tissue. Since the 1990s, X-ray phase contrast imaging mainly includes crystal interferometer method, diffraction enhanced method, coaxial method and grating interferometer method. Since the X-ray phase shift detection requires a relatively high coherence of the X-ray source, it was initially done on synchrotron radiation [1]. In 2006, inspired by the phase measurement of visible light, Pfeiffer et al. added a source grating to the original Talbot interferometer based on two gratings, and proposed a Talbot-Lau interferomet...

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Problems solved by technology

These structures are composed of very small units, each of which has the same size. Generally speaking, the width is small, the height is large, and it has a relatively large aspect ratio. It is extremely unstable. If it is exposed to this for a long time, the absorbing structure will heat up and vibrate. Even deformed, seriously affecting the stability of the light field and the life of the grating

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