X-ray or gamma ray systems or devices – Electronic circuit – Exposure timer
Patent
1991-06-24
1993-02-16
Porta, David P.
X-ray or gamma ray systems or devices
Electronic circuit
Exposure timer
378 99, 378108, H05G 142
Patent
active
051877309
ABSTRACT:
According to the present invention, there is provided an X-ray diagnostic system comprising, an X-ray generator irradiating X-ray toward a patient, an image intensifier transforming the X-ray which has passed the patient to fluorescent light, a CCD for converting the fluorescent light to picture signal under a predetermined optimum quantity of light, a photodiode for detecting quantity of the fluorescent light, a quantity-of-light controller for judging whether the quantity of the fluorescent light detected reaches the predetermined optimum quantity of light at the CCD, an X-ray controller for cutting off the X-ray when the quantity of the fluorescent light reaches the predetermined optimum quantity of light, and a television monitor for displaying an X-ray picture based on the picture signal. This X-ray diagnostic system employs a method of picking up an X-ray picture featured by steps of integrating quantity of the fluorescent light detected by the photodiode and comparing an integrated quantity of the fluorescent light with a predetermined quantity of light accomplishing a quality X-ray picture, and cutting off the X-ray when the integrated quantity of the fluorescent light reaches the predetermined quantity of light. This X-ray diagnostic system and a method used herein enable a quality X-ray picture.
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patent: 4857724 (1989-08-01), Snoeren
patent: 4901336 (1990-02-01), Nishiki
patent: 4901337 (1990-02-01), Fujimoto
patent: 5022063 (1991-06-01), Yokouchi et al.
Kabushiki Kaisha Toshiba
Porta David P.
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