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A system for monitoring a position of a medical instrument with respect to a patient's body, including a medical instrument, a reference mount attachable to the patient's body for movement with the patient's body, and an electromagnetic unit for association with the reference mount and the medical i

A system for monitoring a position of a medical instrument with respect to a patient's body, including a medical instrument, a reference mount attachable to the patient's body for movement with the patient's body, and an electromagnetic unit for association with the reference mount and the medical instrument for monitoring movement of the medical instrument relative to the reference mount. The electromagnetic unit includes a first member attachable to the patient's body and a second member attachable to the medical instrument. The first and second members communicate by electromagnetic radiation.

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1. A system for monitoring a position of a medical instrument with respect to a patient's body, comprising: a medical instrument;a reference mount attachable to the patient's body, wherein the reference mount comprises a headset;markers coupled to the headset for providing reference points on comput

1. A system for monitoring a position of a medical instrument with respect to a patient's body, comprising: a medical instrument;a reference mount attachable to the patient's body, wherein the reference mount comprises a headset;markers coupled to the headset for providing reference points on computer images of the head, wherein each of the markers comprises a radiopaque metal ball; andan electromagnetic unit for monitoring movement of the medical instrument relative to the reference mount, the electromagnetic unit including a first electromagnetic member attachable to the patient's body by the reference mount, and a second electromagnetic member attachable to the medical instrument. 2. The system of claim 1, wherein the reference mount is attachable to the patient's body in a repeatable fashion. 3. The system of claim 1, wherein the headset is configured for attachment to the patient's head at three points of contact. 4. The system of claim 1, wherein the headset is configured for use during scanning and surgery to provide registration with a computer image during surgery. 5. The system of claim 1, wherein the medical instrument comprises an aspirator. 6. The system of claim 5, wherein the aspirator defines an instrument mount for receiving the second electromagnetic member. 7. The system of claim 1, further comprising a position detection unit for producing position data responsive to an output signal from the second electromagnetic member. 8. The system of claim 7, further comprising an image storage unit including image data representing a plurality of images of the patient's body. 9. The system of claim 8, further comprising a registration unit for relating the position data and the image data to select an image of the patient's body. 10. The system of claim 1, wherein the first electromagnetic member comprises an electromagnetic generator, and the second electromagnetic member comprises an electromagnetic receiver. 11. The system of claim 1, wherein the markers are separate and distinct from the first and second electromagnetic members. 12. The system of claim 1, wherein the first and second electromagnetic members are not markers. 13. A system for monitoring a position of an instrument with respect to an object, comprising: an instrument;a reference mount attachable to the object;markers coupled to the reference mount for providing reference points on computer images of the object, wherein each of the markers comprises a radiopaque metal ball; andan electromagnetic unit for monitoring movement of the instrument relative to the reference mount, the electromagnetic unit including a first electromagnetic member attachable to the object by the reference mount, and a second electromagnetic member attachable to the instrument. 14. The system of claim 13, wherein the object is a patient and the reference mount comprises a headset. 15. The system of claim 14, wherein the headset is configured for use during scanning and surgery to provide registration with a computer image during surgery. 16. The system of claim 13, wherein the first electromagnetic member comprises an electromagnetic generator, and the second member comprises an electromagnetic receiver. 17. The system of claim 13, wherein the reference mount is configured to be registered relative to a computer image. 18. The system of claim 13, wherein the markers are separate and distinct from the first and second electromagnetic members. 19. The system of claim 13, wherein the first and second electromagnetic members are not markers. 20. A system for monitoring a position of a medical instrument with respect to a patient's body, comprising: a medical instrument;a reference mount attachable to the patient's body, wherein the reference mount comprises a headset;markers coupled to the headset for providing reference points on computer images of the head; andan electromagnetic unit for monitoring movement of the medical instrument relative to the reference mount, the electromagnetic unit including a first electromagnetic member attachable to the patient's body by the reference mount, and a second electromagnetic member attachable to the medical instrument,wherein the markers are separate and distinct from the first and second electromagnetic members. 21. The system of claim 20, wherein the reference mount is attachable to the patient's body in a repeatable fashion. 22. The system of claim 20, wherein the headset is configured for attachment to the patient's head at three points of contact. 23. The system of claim 20, wherein the headset is configured for use during scanning and surgery to provide registration with a computer image during surgery. 24. The system of claim 20, wherein the medical instrument comprises an aspirator. 25. The system of claim 24, wherein the aspirator defines an instrument mount for receiving the second electromagnetic member. 26. The system of claim 20, further comprising a position detection unit for producing position data responsive to an output signal from the second electromagnetic member. 27. The system of claim 26, further comprising an image storage unit including image data representing a plurality of images of the patient's body. 28. The system of claim 27, further comprising a registration unit for relating the position data and the image data to select an image of the patient's body. 29. The system of claim 20, wherein the first electromagnetic member comprises an electromagnetic generator, and the second electromagnetic member comprises an electromagnetic receiver. 30. The system of claim 20, wherein the first and second electromagnetic members are not markers. 31. A system for monitoring a position of an instrument with respect to an object, comprising: an instrument;a reference mount attachable to the object;markers coupled to the reference mount for providing reference points on computer images of the object; andan electromagnetic unit for monitoring movement of the instrument relative to the reference mount, the electromagnetic unit including a first electromagnetic member attachable to the object by the reference mount, and a second electromagnetic member attachable to the instrument,wherein the markers are separate and distinct from the first and second electromagnetic members. 32. The system of claim 31, wherein the object is a patient and the reference mount comprises a headset. 33. The system of claim 32, wherein the headset is configured for use during scanning and surgery to provide registration with a computer image during surgery. 34. The system of claim 31, wherein the first electromagnetic member comprises an electromagnetic generator, and the second member comprises an electromagnetic receiver. 35. The system of claim 31, wherein the reference mount is configured to be registered relative to a computer image. 36. The system of claim 31, wherein the first and second electromagnetic members are not markers. 37. A system for monitoring a position of a medical instrument with respect to a patient's body, comprising: a medical instrument;a reference mount attachable to the patient's body, wherein the reference mount comprises a headset;markers coupled to the headset for providing reference points on computer images of the head; andan electromagnetic unit for monitoring movement of the medical instrument relative to the reference mount, the electromagnetic unit including a first electromagnetic member attachable to the patient's body by the reference mount, and a second electromagnetic member attachable to the medical instrument,wherein the first and second electromagnetic members are not markers. 38. The system of claim 37, wherein the reference mount is attachable to the patient's body in a repeatable fashion. 39. The system of claim 37, wherein the headset is configured for attachment to the patient's head at three points of contact. 40. The system of claim 37, wherein the headset is configured for use during scanning and surgery to provide registration with a computer image during surgery. 41. The system of claim 37, wherein the medical instrument comprises an aspirator. 42. The system of claim 41, wherein the aspirator defines an instrument mount for receiving the second electromagnetic member. 43. The system of claim 37, further comprising a position detection unit for producing position data responsive to an output signal from the second electromagnetic member. 44. The system of claim 43, further comprising an image storage unit including image data representing a plurality of images of the patient's body. 45. The system of claim 44, further comprising a registration unit for relating the position data and the image data to select an image of the patient's body. 46. The system of claim 37, wherein the first electromagnetic member comprises an electromagnetic generator, and the second electromagnetic member comprises an electromagnetic receiver. 47. A system for monitoring a position of an instrument with respect to an object, comprising: an instrument;a reference mount attachable to the object;markers coupled to the reference mount for providing reference points on computer images of the object; andan electromagnetic unit for monitoring movement of the instrument relative to the reference mount, the electromagnetic unit including a first electromagnetic member attachable to the object by the reference mount, and a second electromagnetic member attachable to the instrument,wherein the first and second electromagnetic members are not markers. 48. The system of claim 47, wherein the object is a patient and the reference mount comprises a headset. 49. The system of claim 48, wherein the headset is configured for use during scanning and surgery to provide registration with a computer image during surgery. 50. The system of claim 47, wherein the first electromagnetic member comprises an electromagnetic generator, and the second member comprises an electromagnetic receiver. 51. The system of claim 47, wherein the reference mount is configured to be registered relative to a computer image.