X-ray recording system for x-ray imaging at high image frequencies of an object under examination by way of direct measurement of the interference pattern

Abstract

An x-ray recording system is disclosed for x-ray imaging of an object under examination by way of direct measurement of an interference pattern, especially for differential, real-time capable phase-contrast imaging. In at least one embodiment, the system includes with at least one x-ray emitter for creating quasi-coherent x-ray radiation; an x-ray image detector, including a detector layer and detector pixels arranged in a matrix; and a diffraction or phase grating, disposed between the object under examination and the x-ray image detector, configured to create an interference pattern, directly detectable in the nth Talbot order by an x-ray image detector with a very high achievable local resolution, which amounts to at least half the wavelength of the interference pattern in accordance with the Nyquist theory arising in the nth Talbot order.

Description

technical field [0001] The invention relates to an x-ray imaging system for x-ray imaging of an examination object by direct measurement of an interference pattern, in particular for differential, real-time-capable phase-contrast imaging, comprising: at least one for generating quasi-coherent x-ray radiation An x-ray emitter, an x-ray image detector with a detector layer and detector pixels arranged in a matrix, a diffraction or phase grating arranged between the examination object and the x-ray image detector and generating an interference pattern. Background technique [0002] Differential phase-contrast imaging is an imaging method that has gained a lot of attention for some time, especially in Talbot-Lau interferometer arrangements. For example in the publication F. Pfeiffer et al. [1], "Hard X-ray dark-field imaging using a grating interferometer", Nature Materials 7, pp. 134 to 137, it is described that by means of a conventional X-ray tube, three An interferometric s...

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Problems solved by technology

[0027] The implementation of this method presents many challenges, but in particular has one very significant disadvantage:

Also such a structure due to the analytical grating G 2 The mechanical movement is not suitable for real-time imaging or imaging with a higher image frequency such as 15 images per second (B / s) or 60 to 100 B / s

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