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Tracking system to follow the position and orientation of a device with radiofrequency field gradients

  • US 5,211,165 A
  • Filed: 09/03/1991
  • Issued: 05/18/1993
  • Est. Priority Date: 09/03/1991
  • Status: Expired due to Term
First Claim
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1. A tracking and imaging system adapted for following a location of at least one invasive device within a subject, comprising:

  • a) an invasive device;

    b) an electromagnetic (EM) field creation means adapted for creating an electromagnetic field of known geometry within the subject attached to the invasive device;

    c) a radiofrequency (RF) receiver means adapted for detecting the electromagnetic field at a plurality of M selected locations, wherein the RF receiver has a sensitivity varying with position;

    d) a tracking means adapted for computing a position and an orientation of the EM field creation means at the M selected locations, responsive to the detected electromagnetic field;

    e) an imaging means adapted for acquiring a medical diagnostic image of a region of interest of said subject;

    f) superposition means for superimposing on the medical diagnostic image of said region of interest, a symbol at the computed position representing the EM field creation means resulting in a superimposed image; and

    g) display means adapted for displaying the superimposed image on the medical diagnostic image of said region of interest.

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