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Method and apparatus for refinably accurate localization of devices and instruments in scattering environments

  • US 6,968,846 B2
  • Filed: 03/07/2002
  • Issued: 11/29/2005
  • Est. Priority Date: 03/07/2002
  • Status: Expired due to Term
First Claim
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1. A method of localizing a device, medical or otherwise, within a three dimensional environment, the method comprising:

  • (a) transmitting time varying magnetic fields from at least three transmitters, (b) receiving the transmitted electromagnetic radiation as induced voltage signals from at least one receiver mounted on or within said device, and (c) processing said received voltage signals in order to extract position and orientation localization information for said device, said processing including phase-shifting and correction for conducting materials in the vicinity by the use of information gathered from fitting said phase-shifted induced voltage signals with polynomial functions having terms in powers of freguency using at least three distinct transmission frequencies for each of said transmitters.

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