X-ray or gamma ray systems or devices – Accessory – Testing or calibration
Patent
1994-11-23
1996-02-20
Church, Craig E.
X-ray or gamma ray systems or devices
Accessory
Testing or calibration
378162, 378166, G01D 1800
Patent
active
054936004
ABSTRACT:
An apparatus for testing an X-ray imaging system includes a cassette with a section for receiving a sheet of photographic film. An intensifier screen emits light upon being stuck by X-rays and is positioned within the cassette so that the light strikes the photographic film. A light sensor produces an electrical signal representing the intensity of light emitted by the intensifier screen and an electrometer integrates the signal. A first analog to digital converter produces a digital value that corresponds to the magnitude of the integrated signal. The digital value is recorded on the photographic film by a light emitting numerical display. A control circuit activates the numerical display after an X-ray exposure has terminated so that the value recorded on the film represents the magnitude of that exposure.
REFERENCES:
"Take a Perfect Radiograph . . . With EXPOSURE," Fairchild Medical Systems, Inc.
"MAMMO-AEC METER Automatic Exposure Control Meter," Diagnostic Imaging Specialists Corporation.
Church Craig E.
MCW Research Foundation
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