Measuring system with a phase-contrast contrast agent and its use for the non-invasive determination of properties of an examination subject

摘要

Measuring system for the non-invasive determination of properties of an examination object and / or of processes and / or conditions in an examination subject by determining the relative phase shift of at least two adjacent coherent X-rays which penetrate the examination subject in a defined way, comprising: 1.1. an X-ray source which directly or indirectly produces the at least two mutually coherent X-rays having a wavelength λ, 1.2. a detector system which is arranged at a distance z1 from the examination subject and is suitable for determining the relative phase shift Φ of the at least two x-ray beams, 1.3. a phase contrast contrast agent (suspension) consisting of a base liquid and a plurality of particles therein, wherein the refractive index of the base liquid nB differs from the refractive index of the particles nP, and 1.4. the examination object, which has a space to be observed, which has a clear width L in the propagation direction of the measuring beams, wherein 1.5. the particles in the phase-contrast contrast agent have a mean radius r satisfying the following geometric relationships: and where κ can range from 1% to 99% and δP and δB correspond to the real decrement of refractive index nP and nB, respectively outer sheath and a core, each with different refractive index, have.