X-ray diagnostics installation having a variable aperture diaphr

Details X-ray diagnostics installation having a variable aperture diaphr X-ray diagnostics installation having a variable aperture diaphr

1994-08-04

1995-05-02

Porta, David P.

X-ray or gamma ray systems or devices

Electronic circuit

With display or signaling

378151, 378160, H05G 164

Patent

active

054127041

ABSTRACT:
An x-ray diagnostics installation includes an x-ray tube, a variable aperture diaphragm, and an x-ray image intensifier video chain which includes an x-ray image intensifier, a video pick-up unit, a processing circuit, and a playback unit. The variable aperture diaphragm has a central region and an outer region which exhibit different x-ray transparencies. When adjusted to a first position, the aperture diaphragm permits x-rays to pass only through said central region unattenuated. The aperture diaphragm is adjusted to a second position for every n.sup.th image, wherein both the central region and the outer region permit x-rays to pass through the diaphragm unattenuated. Each n.sup.th image is entered into an image memory connected to the video pick-up unit and is superimposed on an image produced when the diaphragm is in the first position.

REFERENCES:
patent: 5194726 (1993-03-01), Jonkman
patent: 5287396 (1994-02-01), Stegehuis

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