Progressive correction of ring artifacts in a computed tomograph

Details Progressive correction of ring artifacts in a computed tomograph Progressive correction of ring artifacts in a computed tomograph

1999-01-12

2000-09-05

Bruce, David V.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378901, 382131, H61B 603

Patent

active

061154458

ABSTRACT:
In a method and apparatus for progressive correction of ring artifacts in a computed tomography system, multiple-channel ring artifacts are mitigated or eliminated along with single-channel ring artifacts. Detector channels are iteratively grouped into various size groupings, for example, pairs, and the offset error values of each detector channel grouping are determined. The error values corresponding to each detector channel are accumulated at each iteration, and the final accumulated values are applied to captured projection data. In this manner, ring artifacts can be eliminated from the image in just a few iterations.

REFERENCES:
patent: 4670840 (1987-06-01), Freundlich
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patent: 5745542 (1998-04-01), Gordon et al.
patent: 5774519 (1998-06-01), Lindstrom et al.
patent: 5835618 (1998-11-01), Fang et al.
Kowalski, "Suppression of Ring Artifacts in CT Fan-Beam Scanners," IEEE Transaction on Nuclear Science, pp. 1111-vol. NS-25, No. 5, Oct. 1978.

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