Standard definitions of plaque features
| Plaque Characteristic | Imaging Definition | Histopathologic Correlate |
|---|---|---|
| Calcified plaque | Plaque with increased attenuation of >130 HU | Plaque calcification |
| Soft plaque | Low-attenuation plaque, around 40–50 HU | Intraplaque hemorrhage and lipid-rich necrotic core |
| Plaque ulceration | Extension of contrast material beyond the vascular lumen of the plaque, usually of at least 1 mm | Plaque surface irregularity and ulceration |
| Total plaque thickness | Linear measurement of greatest axial dimension of plaque | Plaque thickness |
| Carotid plaque enhancement | Enhancement of plaque after administration of contrast | Plaque neovascularity |