Click on image to view larger version.

Figure 1 Long-axis view of the proximal thoracic aorta. (Left) Views of the ascending aorta with origin of the inominate artery (IA) obtained by anterior tilting of the transducer. (Right) Views of the distal arch and descending thoracic aorta (dAo) obtained by posterior tilting of the transducer. The origin of the left common carotid artery and the left subclavian artery are visualized in the same plane; the IA can be recognized, but its origin cannot be appropriately delineated in this plane.