Picture-tube video-camera radiology installation
AssigneeThomson-CGR
InventorJean L. Ploix
Life of this patent
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Abstract
In a radiology installation equipped with a picture-tube video camera for producing images in rapid succession, the electron beam of the camera tube has a first intensity at the time of readout of one image on the sensitive tube surface and a second non-zero intensity of substantially lower value than the first between readout of one image and write-in of the next. A control circuit for modifying the grid voltage of the camera tube is accordingly provided for varying the intensity of the electron beam.
Claims11
A radiology installation equipped with a video camera, comprising an image-scanner tube for producing an electron beam utilized in producing images in rapid succession, means for varying the intensity of the electron beam of the image scanner tube from a first intensity at the time of readout of one image on a sensitive surface of said tube to a second non-zero intensity of substantially lower value than the first between readout of one image and write-in of the next, wherein said second intensity results in a more rapid discharge of the sensitive surface of said video camera in comparison to if said image-scanner tube utilizes the electron beam having only said first intensity.
Dependencies are inferred from the claim text.