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Figure 3a.   Normal thoracic aorta. Coronal (a) and oblique sagittal (b) MIP images show the thoracic aorta in a healthy subject. The coronal image (a) shows overlap between the aorta and the pulmonary vasculature. However, the ascending aorta is not obscured by the pulmonary vasculature on the oblique sagittal image (b). Note the small ductus bump (arrow). The arch vessels are well demonstrated on both images.