Moderate | Severe | References | |
CCTA | NA | Calcium score≥450 HU, calcified lesion length>20 mm and/or CCTA score grade 5 | Sekimoto et al 18 |
CAG | Radiopacities noted only during the cardiac cycle before contrast injection | Radiopacities noted without cardiac motion before contrast injection, generally compromising both sides of the arterial lumen | Mintz et al 19 |
IVUS | Arc of calcium<180°, calcified lesion length<5 mm | Calcium angle>180°, calcified lesion length>5 mm and superficial location of the calcified lesion | Mintz et al 19 |
OCT | In the absence of any of the OCT findings of severe coronary calcification | Calcium angle>180°, calcified lesion length>5 mm and maximum calcium thickness>0.5 mm | Fujio et al 20 |
CAG, coronary angiography; CCTA, coronary CT angiography; HU, Hounsefield unit; IVUS, intravascular ultrasound; NA, not available; OCT, optical coherence tomography.