Method for eliminating parasitic noise in an x-ray scanner

Details Method for eliminating parasitic noise in an x-ray scanner Method for eliminating parasitic noise in an x-ray scanner

1989-10-25

1993-06-01

Envall, Jr., Roy N.

Boots, shoes, and leggings

36441313, G06F 1542

Patent

active

052166007

ABSTRACT:
A method for elimination of parasitic noise in an x-ray scanner consists of computing the mean value of the signals of the ten first views in a circuit (26). This mean value is subtracted from the signals of the first view V.sub.1 in a circuit (27) so as to obtain the high-frequency components H.sub.1 which are considered as parasitic noise. The signals H.sub.1 are filtered in a high-pass filter before being subtracted from the signals of the view V.sub.1 to obtain signals V'.sub.1 which are free of parasitic components. The signals V'.sub.1 are processed in a sequential circuit (31) in order to obtain signals V'.sub.2 which are free of parasitic component. The same process is repeated for the signals of the other views V.sub.3 to V.sub.m.

REFERENCES:
patent: 4654796 (1987-03-01), Takagi et al.
Gonzalez et al., Digital Image Processing, 2nd Edition, 1987, Addison-Wesley Pub. Co., pp. 163-175.
IEEE Transactions on Nuclear Science, vol. NS-25, No. 5, Oct. 1978, pp. 1111-1116, IEEE, New York, U.S., C. Kowalski, "Suppression of Ring Artefacts in CT Fan-Beam Scanners".

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