Synergy Between morpHOlogical and inflammatoRy Evaluation in Predicting Long-term Coronary Plaque Progression

Inclusion Criteria: * Male or female participants \> 50 years old * Able to give written, informed consent and to lie flat * Presentation of ACS within \~2 weeks * At least 1 intermediate (30-80% diameter stenosis) non-culprit coronary artery lesion on angiography, managed medically as clinically indicated (i.e.: negative FFR/iFR) Exclusion Criteria: * Women of child bearing potential not using adequate contraception * Contrast allergy or contrast-nephropathy * Uncontrolled atrial fibrillation * Chronic kidney disease (eGFR \<30 l/min/1.73m2) * Uncontrolled chronic inflammatory disorder * History of recent malignancy deemed relevant to the study by the investigator * Current use of systemic corticosteroids * Previous coronary artery bypass grafting surgery (CABG) or percutaneous coronary intervention (PCI) before the index event * Contraindication to coronary angiography * Requires CABG or staged non-culprit artery PCI * Coronary vessels that could not be adequately imaged * Severe valvular heart disease * Any medical condition, in the opinion of the investigator, that prevents the participant from lying flat during scanning, or from participating in the study.