Apparatus and method for four dimensional soft tissue navigation in endoscopic applications
A surgical instrument navigation system is provided that visually simulates a virtual volumetric scene of a body cavity of a patient from a point of view of a surgical instrument residing in the cavity of the patient. The surgical instrument navigation system includes: a surgical instrument; an imaging device which is operable to capture scan data representative of an internal region of interest within a given patient; a tracking subsystem that employs electro-magnetic sensing to capture in real-time position data indicative of the position of the surgical instrument; a data processor which is operable to render a volumetric, perspective image of the internal region of interest from a point of view of the surgical instrument; and a display which is operable to display the volumetric perspective image of the patient.
1. An image-guided method comprising:
directing an endoscope comprising a five degree of freedom tip sensor to an anatomical position in a patient;
capturing video of the patient's anatomy with the endoscope,
aligning the captured video with a visual orientation of a user directing the endoscope to the anatomical position;
activating a steering mechanism of the endoscope to repeatedly move the tip sensor in an arc constrained to a plane;
determining the orientation and location of the tip sensor in the patient as the tip sensor is being repeatedly moved;
defining a sixth degree of freedom of the tip sensor using the determined orientation and location of the tip sensor; and
correlating the determined tip sensor location and orientation with one or more patient images acquired prior to the repeated movement of the tip sensor.
2. The image-guided method of claim 1 wherein the anatomical position is a branching point of a bronchial tree.
3. The image-guided method of claim 1 wherein the tip sensor is an angled coil sensor, the coil being disposed at a 45° angle relative to a core portion of the tip sensor.
4. The image-guided method of claim 1 wherein orientation and location determination comprise applying a deformation vector field.
5. The image-guided method of claim 1 wherein the one or more patient images are derived from an imaging device in conjunction with a patient tracking device disposed at an external region of the patient.