Title:
TOMOGRAPHIC REPRODUCER
Document Type and Number:
Japanese Patent JPS5379395
Kind Code:
A
Abstract:
In tomosynthesis, as is known, a series of individual images taken in different orientations, are superimposed. By shifting the individual images relative to each other the position of the layer which is sharply reproduced can be changed. However, there may still be unsharpness in said layer, in the case of image distortion during recording of the individual images, for example owing to the curvature of the input screen. This image distortion can hardly be compensated for, because it greatly depends on the projection angle. The invention provides a simple method of compensating for such image distortion. The image intensifier is then arranged and steered so that its optical axis is always parallel to the central ray. The distortion caused by the image intensifier curvature is then independent of the projection angle and can be eliminated in a comparatively simple manner. Steering the image intensifier in this way gives rise to additional distortion, because the planes, of which subsequently laminar radiograms are made by superposition, and the optical axis of the image intensifier are no longer perpendicular to each other. However, this is a simple geometric distortion which can be eliminated in a simple manner.
Inventors:
YUURUGEN DEITSUTORIHI
YUURUGEN HAINTSUAARURINHI
DEIITORITSUHI MEIYAAAEBURERITO
RARUFU MEERENDORUFU
FURIIDORITSUHI BORUFU
YUURUGEN HAINTSUAARURINHI
DEIITORITSUHI MEIYAAAEBURERITO
RARUFU MEERENDORUFU
FURIIDORITSUHI BORUFU
Application Number:
JP14893477A
Publication Date:
July 13, 1978
Filing Date:
December 13, 1977
Export Citation:
Assignee:
PHILIPS NV
International Classes:
A61B6/02; G01N23/04; H04N7/18; H05G1/64; (IPC1-7): A61B6/02; G01N23/02; G03B41/16; H04N7/18; H05G1/64