A surgical instrument navigation system is provided that allows a surgeon to
invert
the three-dimensional perspective of the instrument to match their perspective
of the actual instrument. The surgical instrument navigation system includes: a
surgical instrument; an imaging device that is operable to capture image data representative
of a patient; a tracking subsystem that is operable to capture in real-time position
data indicative of the position of the surgical instrument; and a data processor
adapted to receive the image data from the imaging device and the position data
from the tracking subsystem. The data processor is operable to generate a three-dimensional
representation of the surgical instrument as it would visually appear from either
of at least two different perspectives and to overlay the representation of the
surgical instrument onto the image data of the patient. The navigation system further
includes a display that is operable to display the representation of the surgical
instrument superimposed onto the image data of the patient.