×

Digital gamma ray imaging device

  • US 5,132,542 A
  • Filed: 02/11/1991
  • Issued: 07/21/1992
  • Est. Priority Date: 02/11/1991
  • Status: Expired due to Fees
First Claim
Patent Images

1. The method of providing selected image signals of a body through which gamma radiation from a source is passed, comprising the steps of:

  • a. detecting, within each fixed time period of a succession of fixed time periods at a plurality of locations impinged by the gamma radiation, electric charge levels corresponding to the energy level of the gamma radiation to be imaged, said electric charge levels thus being sufficient to cause a detectable response;

    b. counting within each fixed time period from among the charge levels sufficient to cause a detectable response only those electric charge levels at each location which exceed a predetermined threshold level, said predetermined threshold level being approximately equal to the charge level of a photoelectric event which corresponds to an energy level at least higher than the energy level associated with Compton scattering, andc. adding the counted electric charges for the succession of fixed time periods to provide selected signals representing an image of the body;

    wherein uncounted charge levels and thus unwanted image signals are eliminated if they do not reach the threshold level within one of said fixed time periods.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×