Fig. 4

Intracoronary images using intravascular ultrasound (IVUS) and optical coherent tomography (OCT). a-1 At the occlusive site, intravascular ultrasound (IVUS) demonstrated a low-intensity structure with an irregular surface (arrow heads), suggesting the presence of a thrombus a-2 Optical coherent tomography (OCT) revealed that the thrombus showed strong signal attenuation and obscured underlying vascular structures (asterisk), suggesting the presence of a red thrombus, mostly consisting of red blood cells. b Proximal to the occlusive site, IVUS demonstrated a high intensity of the luminal surface and signal attenuation (arrows), indicating the presence of atherosclerotic plaque with calcification