This is a CTA (computed tomography angiography) image of the aortic arch. A CTA image is obtained by injecting intravenous dye, followed by high-resolution CT scanning when the dye is in the arterial circulation. The images are obtained as axial slices that can be reformatted with specialized software programs in the sagittal plane, coronal plane or in three-dimensions. This image is a three-dimensional reformat of the original source images.