Intermediate density marker and a method using such a marker for radiographic examination

  • US 6,985,558 B1
  • Filed: 08/12/1999
  • Issued: 01/10/2006
  • Est. Priority Date: 05/07/1993
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method of radiographic examination of tissue having anatomical detail present in the tissue, comprising the steps of:

  • providing a source of x-ray radiation capable of generating radiation suitable for imaging the tissue;

    selecting a partially radiolucent, partially radiopaque marker having a radiographic density and thickness which permit the marker to both project a radiographic shadow and transmit sufficient radiation to image anatomical detail present in the tissue when the marker and the tissue are exposed to the x-ray radiation during radiographic examination, wherein the marker comprises at least one of aluminum, rubber, plastic and vinyl, the thickness of the marker is less than about 0.4 inches, and the thickness of the marker is selected based upon the density of the tissue being examined and the energy of the radiation being applied to absorb from about 2% to about 75% of the incident radiation;

    positioning the marker between the source of x-ray radiation and the tissue; and

    exposing the marker and the tissue to the x-ray radiation, and generating a radiographic image of the tissue having the shadow of the marker superimposed thereon with the anatomical detail present in the tissue clearly visible through the radiographic shadow projected by the marker.

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