Streak suppression filter for use in computed tomography systems

Details Streak suppression filter for use in computed tomography systems Streak suppression filter for use in computed tomography systems

1996-01-17

1997-10-21

Porta, David P.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378901, 36441319, A61B 603

Patent

active

056804261

ABSTRACT:
The disclosed streak suppression filter is for use with a Computed Tomography (CT) system. The CT system generates a plurality of projection data signals each of which is representative of the density of a portion of an object. The streak suppression filter includes a spatial filter for receiving the projection data signals and for generating therefrom a low frequency signal and a high frequency signal. The streak suppression filter further includes a non-linear filter for generating a filtered signal from the high frequency signal. The streak suppression filter further includes a device for combining the low frequency and filtered signals to generate a streak corrected signal. The streak suppression filter may form the low frequency signal by low pass filtering the raw density signals and may form the high frequency signal by subtracting the low frequency signal from the corresponding raw density signal. The streak suppression filter may form the filtered signal by clipping, or thresholding, the high frequency signal.

REFERENCES:
patent: 4463375 (1984-07-01), Macovski
patent: 5400377 (1995-03-01), Hu et al.
patent: 5416815 (1995-05-01), Hsieh
patent: 5473655 (1995-12-01), Hu
Jiang Hsieh, Image Artifacts, Causes and Correction, Medical CT & Ultrasound: Current Technology and Applications (Goldman et al., ed.) Advanced Medical Publishing (1995) pp. 487-517.

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