Patent ID: 6459772
Filing Date: 2002-10-01
Classification: A61B,G01B

Abstract:
A radiographic reference marker to facilitate the accurate calculation of the degree of magnification or minification of radiographic images, said marker comprising:a reusable portion and a disposable portion, said reusable portion comprising a radiopaque sphere of outside diameter d1, a radiolucent plastic housing capable of frictionally but removably engaging said sphere of outside diameter d1 and comprising a plate attaching face and a housing attaching face, wherein said plate attaching face comprises in a center portion thereof an aperture of a diameter capable of allowing passage therethrough of said sphere of outside diameter d1, and said housing attaching face comprises a first portion of a means for removably attaching said reusable portion to said disposable portion, an attenuating plate comprising a first surface and a second surface, wherein said attenuating plate has a thickness between said first surface and said second surface sufficient to attenuate radiation, and a means for removably attaching said second surface of the attenuating plate to said plate attaching face of the plastic housing, and said disposable portion comprising a mounting substrate comprising a substrate attaching face and a mounting face, wherein said substrate attaching face comprises a second portion of said means for removably attaching said reusable portion to said disposable portion, and wherein said mounting face comprises a means for removably attaching said mounting substrate to a subject.