Patent ID: 8235594
Filing Date: 2012-08-07
Classification: A61B

Abstract:
1. In an X-ray image system having a patient table with an X-ray image film thereon and an overhead X-ray beam source spaced a known distance from the X-ray image film, an alignment fixture, comprising: a frame formed generally from a radio-transparent material, said frame including a base having a plurality of legs adapted for respective seated placement on selected patient landmarks, and an upright post extending generally upwardly from said base, said upright post being joined to a generally horizontally turned upper alignment arm; a radio-transparent grid plate carried by said upright post for vertical adjustment on said post between said base and said upper alignment arm in accordance with a measured patient thickness, said grid plate further including at least one radio-opaque ruled grid for overlying a selected patient anatomical region; and radio-opaque aiming alignment marks carried respectively on said upper alignment arm and on said grid plate; said at least one ruled grid including spaced grid markings which appear in an X-ray image with an apparent parallax image magnification corresponding with the parallax image magnification of the selected patient anatomical region, thereby permitting scaling and selection of an appropriate size prosthesis for surgical implantation.