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Time-based attenuation compensation

  • US 5,400,384 A
  • Filed: 01/25/1994
  • Issued: 03/21/1995
  • Est. Priority Date: 01/29/1993
  • Status: Expired due to Fees
First Claim
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1. An exposure control method for controlling an x-ray assembly which generates radiation, comprising the steps of:

  • (a) determining a first amount of radiation to be generated by the x-ray assembly and attenuated by a subject;

    (b) sampling radiation generated by the x-ray assembly after attenuation of the radiation by the subject;

    (c) determining a second amount of radiation from the attenuated radiation sampled in step (b);

    (d) determining a first exposure time for the second amount of radiation;

    (e) determining whether a condition based on the first amount of radiation, the second amount of radiation, and the first exposure time has been satisfied, wherein the determining step (e) includes the step of using a look-up table to determine a second exposure time for the first amount of radiation based on the first exposure time;

    (f) if the condition has not been satisfied, repeating steps (b) through (e) until the condition has been satisfied; and

    (g) controlling the generation of radiation by the x-ray assembly based on whether the condition has been satisfied.

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