Fig 2. Quantification of an asymmetric right carotid bulb stenosis. A, Axial CTA source image showing asymmetric stenosis of the right carotid bulb (white arrow), with partially calcified posterior carotid bulb wall. B, Axial magnification of the asymmetric right carotid bulb stenosis with measurement calipers placed at the region of narrowest stenosis (calipers marked [A], showing measurement of 0.19 cm [1.9 mm]). C, Axial magnification of the asymmetric right carotid bulb stenosis with the AGFA Impax 4.5 VT measuring the cross-sectional 2D area of 0.03 cm² (3.0 mm²). Note that the narrowest diameter is slightly smaller than on Fig 1, though the area is slightly larger than on Fig 1.