Focus-detector arrangement for generating projective or tomographic phase contrast recordings with X-ray optical gratings

US7564941B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Joachim Baumann · Dortmund, DE
• Christian David · Lauchringen, DE
• Martin Engelhardt · Munich, DE
• Jörg Freudenberger · Eckental, DE
• Eckhard Hempel · Bad Mergentheim, DE
• Martin Hoheisel · Erlangen, DE
• Thomas Mertelmeier · Erlangen, DE
• Franz Pfeiffer · Unterföhring, DE
• Stefan Popescu · Erlangen, DE
• Manfred Schuster · Schrick, AT

Key dates

• Filing date: Jan 31, 2007
• Grant date: Jul 21, 2009
• Expiry date: Jul 26, 2027

Classification

• Technology area (CPC G): Physics
• CPC primary: G21K2207/005
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A focus-detector arrangement of an X-ray apparatus is disclosed for generating projective or tomographic phase contrast recordings with a phase grating. According to at least one embodiment of the invention, in the gaps between its bars, the phase grating includes a filler material whose linear attenuation coefficient in the relevant energy range is greater than that of the bars. The height of the filler material in the gaps is dimensioned on the one hand so that the X-radiation with the energy used for measuring the phase shift generates a phase shift in the X-radiation such that, after the phase grating, the rays which pass through the bars are phase shifted by one half wavelength relative to the rays which pass through the gaps with the filler material. Further, the height of the filler material in the gaps on the other hand is dimensioned so that the attenuation of the X-radiation, at least in relation to the energy used for measuring the phase shift, is the same when passing through the bars and when passing through the filler material.