X-ray imaging apparatus dose calibration method

Details X-ray imaging apparatus dose calibration method X-ray imaging apparatus dose calibration method

1989-02-16

1990-12-25

Howell, Janice A.

X-ray or gamma ray systems or devices

Accessory

Testing or calibration

378 96, 378 97, 378108, 378110, G01D 1800, H05G 138, H05G 144, H05G 134

Patent

active

049809059

ABSTRACT:
An X-ray imaging system includes an X-ray tube which emits X-rays that are converted to visible light image by an image intensifier. This system can be operated in either a fluoroscopic mode in which the visible light image is viewed by a video camera and displayed on a monitor, or a film camera mode in which the visible light image is recorded on film. The X-ray system is calibrated for a selected fluoroscopic dose rate by producing an exposure and sensing the current through a photocathode of the image intensifier. The actual dose rate is derived from the sensed photocathode current. The excitation of the X-ray tube is the adjusted until the actual dose rate is within a given tolerance range of the selected dose rate. The system parameters are then stored for use when the same dose rate is selected again. Parameters for other selectable fluoroscopic dose rates are calculated from the stored parameters. The dose rates for the film camera mode then are calibrated using a fluoroscopic mode exposure.

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patent: 4797905 (1989-01-01), Ochmann et al.
patent: 4809309 (1989-02-01), Beekmans

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