Methods and apparatus for modulating x-ray tube current

Details Methods and apparatus for modulating x-ray tube current Methods and apparatus for modulating x-ray tube current

1996-09-05

1997-12-09

Wong, Don

X-ray or gamma ray systems or devices

Electronic circuit

X-ray source power supply

378145, 378110, H05G 134

Patent

active

056968078

ABSTRACT:
The present invention, in one form, is a system for modulating x-ray tube current as a function of gantry angle and slice location in a computed tomography system. In one embodiment, a desired noise level for a final image is selected, and a desired minimum x-ray photon reading and a desired average x-ray photon reading are identified to produce an image in accordance with the desired noise level. During scanning, actual x-ray photon readings are used with the desired average x-ray photon reading and the desired minimum x-ray photon reading to generate an x-ray modulating factor. This modulating factor is then used to modulate the x-ray tube current.

REFERENCES:
patent: 4454606 (1984-06-01), Relihan
patent: 4748649 (1988-05-01), Griesmer et al.
patent: 4942596 (1990-07-01), Eberhard et al.
patent: 5432833 (1995-07-01), Coe

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