|OCT (14)||IB-IVUS (8)||Conventional IVUS (19)|
|Calcification||Heterogeneous, sharply delineated, signal-poor or signal-rich region or alternating signal-poor or signal-rich region||−23 to −30 dB||Bright echoes, which have density equal to or greater than that of the adventitia with a phenomenon known as “acoustic shadowing”|
|Fibrosis||Homogeneous, signal-rich regions||−55 to −64 dB||An intermediate echogenicity between echo-lucent atheromatous and highly echogenic calcified plaques|
|Lipid pool||Homogenous, diffusely bordered, signal-poor regions with overlying signal-rich bands||−65 to −72 dB overlaid with −55 to −64 dB||Homogenous echo-density less than that of the adventitia, and no calcification was present|
|Intimal hyperplasia||Signal-rich layer adjacent to the lumen||−65 to −72 dB at the surface of the lumen|
IB-IVUS = integrated backscatter intravascular ultrasound; IVUS = intravascular ultrasound; OCT = optical coherence tomography; ROI = region of interest.