Deconvolution filter for CT system

Details Deconvolution filter for CT system Deconvolution filter for CT system

1991-11-20

1994-11-01

Dzierzynski, Paul M.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378901, 36441321, G01N 23083

Patent

active

053612914

ABSTRACT:
A CT apparatus for reducing aliasing in reconstructed images uses an x-ray tube with a translatable focal spot to double the spatial sampling rate, over that achieved by a conventional CT machine. Radial resolution artifacts in the image, identified to the "bleeding through" of previous samples from different focal spot positions into the present sample are removed by a convolution process employing the inverse of the detector transfer function. Timing of the data sampling with respect to the changing of the wobble positions is also employed to minimize the bleed through and to improve signal-to-noise ratio.

REFERENCES:
patent: 4066902 (1978-01-01), LeMay
patent: 4066903 (1978-01-01), LeMay
patent: 4068306 (1978-01-01), Chen et al.
patent: 4206360 (1980-06-01), LeMay
patent: 4606004 (1986-08-01), Crawford et al.
patent: 4637040 (1987-01-01), Sohval et al.
IEEE International Symposium on Circuits and Systems, vol. 1, May 1990 U.S., pp. 234-237, Shieh et al.
Reordering Schemes for Multiple-Rotation Fan-Beam CT Scanner, J. Jelinek et al., IEEE Transactions on Medical Imaging, vol. M1-4, No. 4, Dec. 1985.

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