Gated chest computed tomography angiography showing anatomical relations of the innominate artery with surrounding structures. 3D volume-rendered image (A) with and (B) without the sternum. Centre line generation with multiplanar reformation performed to evaluate innominate artery diameter and distance of access to annular plane. (C) Repositioning of 3D reconstruction is performed to mimic intraprocedural position on the table to evaluate the relationship between the innominate artery and the adjacent bony structures and mediastinum.