Artifact correction for highly attenuating objects

X-ray or gamma ray systems or devices – Specific application – Computerized tomography

Patent

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Details

378 8, 378901, A61B 603

Patent

active

060350121

ABSTRACT:
The present invention, in one form, is a method for correcting for artifacts caused by highly attenuating objects in a CT image data using a correction algorithm. In accordance with one embodiment of the algorithm, the highly attenuating objects are identified in the image data using the CT numbers from the image data. The segmented image data for each highly attenuating material are used to produce separate component images for each material. The component image data for each material is then separately forward projected to generate projection data for each material. The projection data for each material is then adjusted for the attenuation characteristic of the material to generate projection error data for each material. The resulting projection error data are then filtered and backprojected to produce error-only image data. The error-only image data are then scaled and combined with the original image data to remove the highly attenuating object artifacts.

REFERENCES:
patent: 4626991 (1986-12-01), Crawford et al.
patent: 5412703 (1995-05-01), Goodenough et al.
patent: 5727041 (1998-03-01), Hsieh

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