Ring artifact correction for computerized tomography

Details Ring artifact correction for computerized tomography Ring artifact correction for computerized tomography

1986-03-26

1987-06-02

Harkcom, Gary V.

Boots, shoes, and leggings

378 4, 378901, G06F 1542

Patent

active

046708405

ABSTRACT:
A method for the correction of ring artifacts in images obtained by rotate-rotate computerized tomography (CT) scanners includes the step of reconstructing an original image, which comprises a real image and a ring artifact image. The ring artifact image is determined by edge enhancing the original image and dividing the edge enhanced original image into rings or annuli with the annuli being concentric around the axis of rotation. The average intensity is determined for each concentric annulus. This average value of each annulus is substracted from pixels of the original image belonging to that annulus to provide a ring artifact free image.

REFERENCES:
patent: 4217641 (1980-08-01), Naparstek
patent: 4233662 (1980-11-01), Le May
patent: 4272820 (1981-06-01), Lux
patent: 4295195 (1981-10-01), Hounsfield
patent: 4399457 (1983-08-01), Riederer et al.
patent: 4415980 (1983-11-01), Buchanan
patent: 4437161 (1984-03-01), Anderson
patent: 4450478 (1984-05-01), Ledley
Suppression of Ring Artifacts In CT Fan-Beam Scanners (IEEE Transactions on Nuclear Science, vol. NS-25, No. 5, Oct. 1978 by G. Kowalski--pp. 1111-1116).

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