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Figure 1 Designated sites of quantitative carotid angiography (QCA) and intravascular ultrasound (IVUS) measurements. QCA: (A) before intervention; (B) post-carotid stent deployment; (C) six-month follow-up. (D) IVUS: (Top) calcified plaque at lesion site pre-intervention; (Bottom) internal carotid artery (ICA) stent post-procedure. 1 = distal ICA reference; 2 = lesion site; 3 = proximal common carotid artery (CCA) reference; 4 = lesion site in-stent; 5 = ICA stent minimal luminal diameter (MLD); 6 = ICA stent reference site; 7 = CCA stent MLD; 8 = CCA stent reference site; 9 = lumen MLD (line) and lumen area (circle); 10 = stent MLD (line) and stent area (circle).