Figure 1.

Methodology panel, MPR-based ICA stenosis diameter measurements: sagittal (A) and coronal (B) multiplanar reconstructions allow the identification of both the non-stenotic distal diameter [NASCET (C)] and the stenosis region. After the adjustment of either the coronal or sagittal plane for the optimal perception of the stenotic vessel configuration along the stenotic segment principal orientation, the subsequent perpendicular axial reconstruction of excellent spatial CTA resolution allows the outstanding distinction of vascular pathology (C), that is, calcified plaque (#), non-contrasted soft plaque (area enclosed by dashed line), and residual ICA lumen (encircled by green line). This plane is used for locating the smallest diameter [NASCET (A)]. Finally, the minimum stenotic diameter can be measured defined as the smaller of the two measurable diameters. External carotid artery branches (*) appear as homogenously contrasted additional lumina.