Motion artifact suppression filter for use in computed tomograph

Details Motion artifact suppression filter for use in computed tomograph Motion artifact suppression filter for use in computed tomograph

1996-03-13

1997-09-23

Porta, David P.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378901, 36441317, A61B 603

Patent

active

056712634

ABSTRACT:
The disclosed motion artifact filter generates motion corrected signals from projection data signals to compensate for motion artifacts in CT images. Each measurement of the projection data signals is representative of the density of all the mass occupying a volume between an X-ray source and a detector at a particular projection angle. The motion artifact filter includes a high pass filter for generating high frequency signals representative of patient movement. Each measurement of the high frequency signals is generated by combining groups of measurements of the projection data signals corresponding to volumes that are proximal to each other. Each measurement of the motion corrected signals is generated by subtracting a portion of a measurement of a high frequency signal from its associated measurement of a projection data signal. The portions increase as the projection angle approaches a starting angle and the portions decrease as the projection angle approaches an intermediate angle.

REFERENCES:
patent: 5229934 (1993-07-01), Mattson et al.
patent: 5416815 (1995-05-01), Hsieh
patent: 5446799 (1995-08-01), Tuy
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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