Methods and systems for helical overscan reduction

Details Methods and systems for helical overscan reduction Methods and systems for helical overscan reduction

2006-09-26

2006-09-26

Thomas, Courtney (Department: 2882)

X-ray or gamma ray systems or devices

Beam control

Collimator

C378S016000, C378S020000

Reexamination Certificate

active

07113570

ABSTRACT:
Methods, apparatus and systems for controlling x-ray exposure during a scan with a computed tomography system are provided. The system includes an x-ray source, a collimator, and a detector array. The collimator includes a first cam configured to shutter an x-ray fan beam, generated by the x-ray source, in a first direction, a second cam located on an opposite side of a focal point of the x-ray source from the first cam, the second cam configured to shutter the x-ray fan beam in a second direction, the second direction being opposite from the first direction, and a cam drive configured to position at least one of the first cam and the second cam during the scan.

REFERENCES:
patent: 5644614 (1997-07-01), Toth et al.
patent: 5982846 (1999-11-01), Toth et al.
patent: 6023494 (2000-02-01), Senzig et al.
patent: 6173039 (2001-01-01), Hampel et al.
patent: 6385279 (2002-05-01), Toth et al.

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