X-ray or gamma ray systems or devices – Electronic circuit – Exposure timer
Patent
1985-07-02
1987-06-16
Church, Craig E.
X-ray or gamma ray systems or devices
Electronic circuit
Exposure timer
358111, H05G 164
Patent
active
046741089
ABSTRACT:
An X-ray photographing device of a digital fluorographic apparatus for use in X-ray diagnosis includes an image intensifier for converting X-rays transmitted through an object to an optical image, and a TV camera for converting the optical image to a television video signal. An effective video level range of the TV camera is narrower than that of the image intensifier. In order to perform a proper X-ray transmittance correction for the object, an X-ray television video signal is converted, at levels out of the effective video level range of the TV camera, to a maximum allowable input video level. In a TV monitor, the levels of the television signal which are out of the effective video signal level range of the TV camera are displayed at the maximum signal level to permit a ready transmittance correction operation. The subtraction image is displayed in accordance with the proper corrected levels.
REFERENCES:
patent: 4204226 (1978-05-01), Mistretta et al.
patent: 4323973 (1982-04-01), Greenfield
patent: 4423521 (1983-12-01), Haendle et al.
Asahina Hiroshi
Ogura Ichiro
Church Craig E.
Kabushiki Kaisha Toshiba
Porta David P.
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