Representative images of high intensity signal (HIS) positive plaque (A1) and HIS-negative plaque (A2). The HIS-positive plaque shows a hyperintense region in the vessel wall without connection to the lumen (white arrow). The HIS-negative plaque shows no such hyperintense region in the vessel wall but did contribute to luminal stenosis. Lipid-rich necrotic core (LRNC) (B1 & 2; white arrowheads) and intraplaque hemorrhage (IPH) (C1 & 2; red arrowheads) are displayed using three dimensionally reconstructed images. The volume of LRNC and IPH were calculated by summing the products of cross-sectional areas and corresponding slice thicknesses.