Focus - detector - configuration for the production of projective or tomography phase contrast images with x-ray optical gratings, as well as x-ray - a system, x-ray - c - arc - system and x-ray computer tomography - - - system

摘要

Focus - detector - arrangement (f₁, D₁) an x-ray device (1) for the production of projective or tomography phase contrast images of an examination subject (7, p), at least consisting of:1.1. a radiation source (2) with a point of focus for the generation of x-rays and irradiation of the object to be examined (7, p),1.2. a in the beam path behind the object to be examined (7, p) arranged phase grating (g₁), which an interference pattern of the x-ray radiation in a predetermined energy range (e) of the x-ray radiation is generated, and1.3. an analysis - detector - a system (g₂, D₁) which at least the of the phase grating (g₁) the interference pattern generated in a spatially resolved manner detected with respect to its phase shift,1.4. wherein in the beam path between the focus and the object to be examined (7, p) an x-ray optical absorption grating is constructed as a source grating is inserted,characterized in thatthe phase grating (g 1.5.₁) in the gaps (l) between its webs (s) a filler (b), the linear attenuation coefficient in the relevant energy range (e) is higher than that of the webs (s), further1.6. the height (h_xf, h_xyf) of the filler material (b) in the gaps (l), on the one hand, is dimensioned in such a way that the x-ray radiation of the energy used to measure the phase shift and wavelength (λ) in a phase shift of the x-ray radiation generated in such a way that after the phase grating (g₁) the beams (a), which penetrate the webs (s), with respect to the beams (b), said gaps (l) with the filling material (b), penetrate half a wavelength (λ / 2) are phase-shifted,1.7. and, on the other hand, is dimensioned in such a way that the weakening of the x-ray radiation, at least in relation to the amount of energy which is to measure the phase shift, when passing through the webs (s) and upon passing through the filling material (b) is the same.