Three-dimensional intravascular ultrasound images. (Left) Color-coded map of plaque volume response. Each color corresponded to plaque volume compression and expansion (percentage per 10 mmHg). Light green to orange signified plaque expansion, and dark green to blue indicated plaque compression during cardiac cycle. (Middle) Three dimensional integrated backscatter intravascular ultrasound (3D IB-IVUS) color-coded map that showed plaque components. (Right) 3D IB-IVUS color-coded map that depicted only lipid pool at the same lesion as the middle image. Note that plaque area response in the lesion with relatively many lipid pools (left side of the segment) was greater than that in the lesion with relatively few lipid pools (right side of the segment).