Figure 2. Example registration for patient 2, run A. These angiograms show a large anterior communicating artery aneurysm in an oblique frontal view after injection of the right internal carotid artery. The root mean square reprojection error in the start position (C) was 8.2 mm and after automated registration (D) 0.9 mm.

A: Maximum opacity arterial display subtraction angiography, "2D-MAX", image.

B: Gold standard registration performed manually in about 20 min.

C: Starting position for the registration.

D: Computed registration position achieved in 3 min.