Figure 4.

Carotid CT angiography using photon-counting computed tomography. The figure shows advanced reconstructions of a carotid artery tree derived from a photon-counting CT (Scanner: NAEOTOM Alpha, Siemens) acquisition (A–D). In (A,B), a longitudinal multiplanar reconstruction shows the right common and internal carotid artery with no significant luminal stenosis and a mild predominantly calcified atherosclerotic plaque at the internal carotid origin (arrowhead). In (C,D), a longitudinal multiplanar reconstruction shows the left common and internal carotid artery with a minimal arterial wall irregularity at the internal carotid origin (arrowhead). What is a bit unusual is to be able to see the thickness of the arterial wall at this level in a case with very mild atherosclerotic disease.