Diagnostic system having gaze tracking

1. A method for comparing image portions of at least two images of a same object, comprising the steps of:

displaying a first digital image of the object on a display;

determining gaze data of a user viewing the first digital image displayed on the display;

determining the portion of the first digital image of the object being viewed by the user corresponding to the determined gaze data to identify a first gaze region;

accessing a second digital image of the same object;

determining, in the second digital image, a second gaze region of the second digital image corresponding to the first gaze region; and

displaying the first and second gaze regions on the display to compare the first and second digital images of the same object.

2. The method for comparing image portions of at least two images of claim 1 in which the first and second digital images are different projections on the same part of a body.

3. The method for comparing image portions of at least two images of claim 1 in which the first and second digital images are taken using first and second different imaging methods.

4. The method for comparing image portions of at least two images of claim 3 in which the different imaging methods are computed tomography and ultrasound.

5. The method for comparing image portions of at least two images of claim 4 in which the first and second digital images are calibrated to each other so that they can be displayed in spatial alignment.

6. The method for comparing image portions of at least two images of claim 1 in which the first and second digital images are taken at first and second different times.

7. The method for comparing image portions of at least two images of claim 1 in which the first and second digital images are first and second computed tomography slices.

8. The method for comparing images of at least two images of 7 in which the coordinate systems for the first and second computed tomography slices are the same.