X-ray fluoroscopic apparatus

Details X-ray fluoroscopic apparatus X-ray fluoroscopic apparatus

1989-12-13

1991-08-06

Westin, Edward P.

X-ray or gamma ray systems or devices

Specific application

Absorption

378 22, 378162, 378 99, 378 4, 358111, 35821316, 25037009, G01N 2304

Patent

active

050383698

ABSTRACT:
An X-ray fluoroscopic apparatus comprises an X-ray tube for emitting X-rays to an object to be examined, an image intensifier for converting an X-ray image of the object to an optical image, a TV camera for picking up the optical image through a light-tight optical system coupled to the output portion of the image intensifier, an A/D converter for converting an output analog signal of the TV camera to a digital image signal, a selector for outputting the output of the A/D converter to its first and second outputs, an offset memory connected to the first output terminal of the selector, a subtracter for subtracting the output of the offset memory from the second output terminal of the selector, and an image memory to which the output of the subtracter is supplied. When no X-rays are emitted, the selector is connected to the side of the first terminal and an offset signal for each of pixels for one frame output from the TV camera is written into the offset memory. When X-rays are emitted, the selector is connected to the side of the second terminal and the output of the offset memory is subtracted from the X-ray image signal by the subtracter so that an offset-compensated image signal for each of pixels is stored in the image memory.

REFERENCES:
patent: 4179711 (1979-12-01), Nagumo
patent: 4216503 (1980-08-01), Wiggins
patent: 4485480 (1984-11-01), Kohno et al.
patent: 4554453 (1985-11-01), Feigt et al.
patent: 4602291 (1986-07-01), Temes
patent: 4811105 (1989-03-01), Kinoshita et al.
patent: 4821108 (1989-04-01), Barbagelata et al.
patent: 4839729 (1989-06-01), Ando et al.

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