Self calibrating ring suppression filter for use in computed tom

Details Self calibrating ring suppression filter for use in computed tom Self calibrating ring suppression filter for use in computed tom

1997-04-29

1998-11-24

Porta, David P.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378901, 378 8, A61B 603

Patent

active

058418288

ABSTRACT:
A computed tomography (CT) system utilizes a ring suppression filter for suppressing ring artifacts in a CT image. The system generates projections at a plurality of projection angles, and each projection includes one measurement of a plurality of projection data signals. The ring suppression filter includes a high pass filter, a histogram generator, and a combiner. The high pass filter generates a measurement of an error signal corresponding to each of the measurements of one of the projection data signals, and each of the error signal measurements is representative of the high frequency components in a portion of one of the projections. The histogram generator generates a histogram signal representative of a relationship between the measurements of the error signal and the measurements of the projection data signal. The combiner combines the measurements of the error signal and the histogram signal to generate a plurality of measurements of a ring corrected signal.

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Kowalski, G., Suppression Of RIng Artifacts In CT Fan-Beam Scanners, IEEE, vol. NS-25, No. 5), Oct. 1978, pp. 1111-1116.

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