System and method for distortion reduction in an electromagnetic tracker

• US 20050107687A1
• Filed: 06/16/2004
• Published: 05/19/2005
• Est. Priority Date: 11/14/2003
• Status: Abandoned Application

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Anderson, Peter Traneus
• Application Number:
  US10/869,594
• Publication Number:
  US 20050107687A1
• Time in Patent Office: Days
• US Class Current: 600/424
• CPC Class Codes: A61B 2034/2051 Electromagnetic tracking systems
• CPC Class Codes: A61B 2562/17 Comprising radiolucent components
• CPC Class Codes: A61B 34/20 Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
• CPC Class Codes: A61B 5/06 Devices, other than using radiation, for detecting or locating foreign bodies for removing same A61B17/50 ; determining position of probes within or on the body of the patient
• CPC Class Codes: A61B 5/062 using magnetic field
• CPC Class Codes: A61B 6/487 involving fluoroscopy
• CPC Class Codes: G01S 5/0215 Interference
• CPC Class Codes: G01V 13/00 Manufacturing, calibrating, cleaning, or repairing instruments or devices covered by groups G01V1/00 – G01V11/00

Abstract

Certain embodiments of the present invention provide a system and method for distortion analysis and reduction in an electromagnetic tracker. Certain embodiments of the system include a tracking analysis unit for analyzing a tracking behavior of an instrument and a tracking modification unit for compensating for the tracking behavior of the instrument. The tracking modification unit may compensate for the tracking behavior of the instrument by adjusting the tracking behavior of the instrument. The tracking modification unit may also compensate for the tracking behavior of the instrument by adjusting a tracking system for tracking the instrument. The tracking analysis unit may test the adjusted tracking behavior of the instrument. In an embodiment, the tracking analysis unit generates a map and/or a model of a distortion characteristic of the instrument. The distortion characteristic may be a magnetic field. The distortion handling system is a computer simulated distortion handling system.

Claims

1. An improved electromagnetic tracking system, the system comprising:

a transmitter for transmitting a signal;

a receiver for receiving the signal from the transmitter, said transmitter and receiver for use in tracking an object; and

a distortion handling system for analyzing a distortion characteristic of the object.

2. The system of claim 1, wherein the distortion handling system analyzes the signal received by the receiver to determine tracking accuracy.

3. The system of claim 1, wherein the distortion handling system comprises a virtual electromagnetic tracker for simulating an effect of the distortion characteristic on tracking.

4. The system of claim 1, wherein the distortion handling system adjusts a tracking behavior of the object.

5. The system of claim 1, wherein the distortion characteristic comprises a magnetic field.

6. A distortion handling system, the system comprising:

a tracking analysis unit for analyzing a tracking behavior of an instrument; and

a tracking modification unit for compensating for the tracking behavior of the instrument.

7. The system of claim 6, wherein the tracking analysis unit further tests an adjusted tracking behavior of the instrument.

8. The system of claim 6, wherein the tracking modification unit compensates for the tracking behavior of the instrument by adjusting the tracking behavior of the instrument.

9. The system of claim 6, wherein the tracking modification unit compensates for the tracking behavior of the instrument by adjusting a tracking system for tracking the instrument.

10. The system of claim 6, wherein the tracking analysis unit generates at least one of a map and a model of a distortion characteristic of the instrument.

11. The system of claim 10, wherein the distortion characteristic comprises a magnetic field.

12. The system of claim 6, wherein the distortion handling system comprises a computer simulated distortion handling system.

13. A virtual tracking system, the system comprising:

an object simulation module for simulating an object to be tracked; and

a simulation toolset for analyzing at least one distortion characteristic of the object, the simulation toolset capable of generating distortion information for the object based on the at least one distortion characteristic.

14. The system of claim 13, wherein the simulation toolset further comprises an accuracy module for determining accuracy of simulated tracking of the object.

15. The system of claim 13, wherein the simulation toolset further comprises a distortion detection module for determining an impact of distortion from the object on tracking accuracy.

16. The system of claim 13, wherein the simulation toolset further comprises a distortion modeling module for generating an electromagnetic model for evaluating a distorting effect of the object on a tracker environment.

17. The system of claim 13, wherein the simulation toolset further comprises a distortion compensation module for improving distortion tolerance of an electromagnetic tracker.

18. A method for distortion analysis in an electromagnetic tracking system, the method comprising:

measuring a tracking behavior of an object; and

analyzing the tracking behavior of the object to determine a distortion effect.

19. The method of claim 18, wherein the analyzing step further comprises generating at least one of a field map and a model to analyze the tracking behavior of the object to determine the distortion effect.

20. The method of claim 18, further comprising simulating tracking of the object to determine the distortion effect.

21. The method of claim 18, further comprising adjusting the tracking behavior of the instrument to reduce the distortion effect.

22. The method of claim 21, further comprising testing the instrument to verify a reduced distortion effect.

23. The method of claim 18, further comprising adjusting an electromagnetic tracker to compensate for the distortion effect.

24. The method of claim 23, further comprising testing the instrument to verify a reduced distortion effect.

25. The method of claim 18, further comprising modeling electromagnetic fields in an electromagnetic tracking environment to analyze the distortion effect.

26. The method of claim 18, further comprising improving distortion tolerance in an electromagnetic tracking system based on the distortion effect.