Fig. 1.

Diagram of the study protocol. First, CTA and fluoroscopy were acquired during an EVAR procedure. After the procedure, the images were retrieved and the vertebral column was fused automatically by the registration algorithm on an anteroposterior (AP) image. After this, regular manual image fusion was performed, 30° right anterior oblique (RAO) and left anterior oblique (LAO), in the identical patients to function as a control group. To correct for inter-observer variability, this was performed by two physicians. Fusion results were assessed on bone alignment measurements (mm) at the lateral edges of the vertebrae and vascular alignment measurements at the lowest renal artery orifice