X-ray or gamma ray systems or devices – Electronic circuit – Exposure timer
Patent
1990-01-23
1991-06-04
Fields, Carolyn E.
X-ray or gamma ray systems or devices
Electronic circuit
Exposure timer
358111, 378116, H05G 164, H04N 532
Patent
active
050220632
ABSTRACT:
In a real-time digital radiographic apparatus, an image is picked up by means of a TV camera. In a fluoroscopic monitoring mode, an output of the TV camera is displayed on a display in real time. In a radiographic imaging mode, the output of the TV camera is A/D converted, subjected to a necessary image processing and held as image data for diagnosis. In the fluoroscopic monitoring mode, a beam scanning for an image pickup tube corresponding to an NTSC system is performed whereas in the radiographic imaging mode a high-density and low-speed beam scanning can be selected in which the number of scanning lines is increased and the frame rate is lowered. In order to suppressing the lowering of the maximum signal current derivable from the image pickup tube which may occur in such a high-resolution scanning, a target voltage of the image pickup tube in a high-resolution mode is changed to a value higher than a standard value of the target voltage, thereby acquiring an image which has a wide dynamic range and a high S/N ratio.
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patent: 3869602 (1975-03-01), Sezaki et al.
patent: 4013833 (1977-03-01), Zimmerman
patent: 4204225 (1980-05-01), Mistretta
patent: 4706268 (1987-11-01), Onodera
patent: 4802002 (1989-01-01), Plut et al.
patent: 4809071 (1989-02-01), Yokouchi et al.
patent: 4881124 (1989-11-01), Yokouchi et al.
Funo Takakazu
Onodera Yoichi
Tsuneoka Masayuki
Yokouchi Hisatake
Chu Kim-Kwok
Fields Carolyn E.
Hitachi Medical Corporation
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