Parameters on IVUS are greater and correlate with those on QCA about: lesions lengths (R = 0.745, P < 0.001); Minimal lumen diameters (MLD) at most stenotic sites (R = 0.552, P < 0.001), MLDs at proximal reference sites (R = 0.491, P < 0.001), MLDs at distal reference sites (R = 0.595, P < 0.001); Midwall diameters (MidD) on IVUS vs MLDs on QCA at proximal reference sites (R = 0.514, P < 0.001) and at distal reference sites (R = 0.604, P < 0.001).