Reduced partial volume artifacts in image reconstruction, with a

Details Reduced partial volume artifacts in image reconstruction, with a Reduced partial volume artifacts in image reconstruction, with a

1993-02-04

1995-05-02

Dzierzynski, Paul M.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378 4, 378901, 36441318, G01N 23083

Patent

active

054127033

ABSTRACT:
An apparatus for correcting an X-ray tomographic image is presented, where the tomographic image is created by measuring an X-ray transmission coefficient at each of a plurality of X-ray beam paths through an object to enable reconstructing a tomographic image of the object. There is a device for selecting a plurality of volume averaged voxels along at least one of the X-ray beam ray paths, and for placing contiguous volume averaged voxels in a run length of volume averaged voxels, to make a plurality of run lengths of volume averaged voxels. There is a device for dividing the plurality of run lengths of volume averaged voxels into a plurality of subslices. There is a device, responsive to the plurality of subslices and responsive to the plurality of run lengths of volume averaged voxels, for computing a corrected value of X-ray attenuation coefficient for the X-ray beam ray path. There is a device for reconstructing a correction image using the corrected X-ray attenuation coefficient for each X-ray beam ray path. Finally, there is a device for obtaining an improved image by combining the tomographic image with the correction image.

REFERENCES:
patent: 5079699 (1992-01-01), Tuy et al.
patent: 5241576 (1993-08-01), Lonn
patent: 5253171 (1993-10-01), Hsiao et al.

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