Computed tomography system with control and correction of fan be

Details Computed tomography system with control and correction of fan be Computed tomography system with control and correction of fan be

1991-06-21

1992-07-14

Howell, Janice A.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378146, 378147, 378901, G21K 112, G21K 102

Patent

active

051310210

ABSTRACT:
A detector for detecting z-axis position in the plane of the fan beam of a computed tomography machine with respect to the detector array employs a pair of slotted masks over independent detector cells, the slots creating exposed widths that decrease and increase along their length. The intensity signals from the two detector cells so masked are subtracted to produce a z-axis position signal eliminating the effect of dark currents. Multiple cells may be ganged to reduce the effects of sensitivity variations among pairs of detector cells. The z-axis position signal may be used to control the z-axis position of the fan beam with respect to the detector array and to reduce the effect of the detector cell's variations in sensitivity.

REFERENCES:
patent: 4559639 (1985-12-01), Glover et al.
patent: 4750196 (1988-06-01), Harding
patent: 4831260 (1989-05-01), DiBianca
patent: 4856041 (1989-08-01), Klein et al.
patent: 4991189 (1991-02-01), Boomgaarden et al.
patent: 5050199 (1991-09-01), Watanabe

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