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Method and structure for optimizing radiographic quality by controlling X-ray tube voltage, current, focal spot size and exposure time

  • US 4,763,343 A
  • Filed: 09/23/1986
  • Issued: 08/09/1988
  • Est. Priority Date: 09/23/1986
  • Status: Expired due to Term
First Claim
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1. An X-ray apparatus comprisingan X-ray tube having a cathode which emits electrons and an anode on which said electrons impinge and which is a source of X-rays, said tube having an operating voltage which is the voltage drop between said anode and said cathode, a tube current which is the current between said anode and said cathode, and a focal spot size which is the area of said anode on which said electrons impinge, and in which said voltage, said current and said current and said focal spot size have initial settings;

  • a collimator having an opening through which said X-rays leaving said source in the direction of said opening may pass;

    means for holding tissue to be examined in position for being irradiated;

    means for showing an image of X-rays which have passed through said tissue;

    at least one sensor which generates sensor signals for detecting radiation passed through said tissue and through said means for showing an image, and for calibrating said X-ray apparatus; and

    means for receiving said sensor signals from said at least one sensor and based on said sensor signals sending control signals which control said operating voltage, said tube current, and said focal spot size.

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