X-ray or gamma ray systems or devices – Specific application – Holography or interferometry
Patent
1998-12-03
1999-07-27
Porta, David P.
X-ray or gamma ray systems or devices
Specific application
Holography or interferometry
378 37, G03H 500
Patent
active
059303255
ABSTRACT:
A phase-contrast X-ray imaging system according to the present invention comprises an X-ray interferometer, wherein X-ray interfering beams thicker than 2 cm.times.2 cm are formed enabling observation of comparatively large objects. The X-ray interferometer is constituted by two crystal blocks which each are monolithically cut out from ingots of crystal and have two wafers which function as X-ray half mirrors. An optical equipment, a chamber, and a feedback system are incorporated to adjust and stabilize the crystal blocks. A device is also incorporated to obtain an image showing the distribution of the X-ray phase shift with which diagnosis become easier and reliable.
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patent: 4174478 (1979-11-01), Franks
"Phase-Contrast Radiographs of Nonstained Rat Cerebellar Specimen", by A. Momose, Med. Phys. 22, pp. 375-379 (1995).
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"Digital Wavefront Measuring Interferometer for Testing Optical Surfaces and Lenses", by J. H. Bruning et al, Applied Optics, pp. 2693-2703 (1974).
"The Skew-Symmetric Two-Crystal X-Ray Interferometer", by P. Becker et al, J. Appl. Cryst. 7, 593 (1974).
Hitachi , Ltd.
Porta David P.
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