SINGapore SoniCracker IntraVascular Lithotripsy (SING IVL) Study

Inclusion Criteria: 1. Patients at age ≥ 21 years old. 2. Patients undergoing elective/ planned PCI with at least moderate coronary calcification on angiography at the target lesion are eligible for enrolment. Moderate coronary calcification is defined as densities on only one side of the arterial wall prior to contrast injection. Severe calcification was defined as radiopacities on both sides of the arterial wall prior to contrast injection. 3. Patients need to demonstrate evidence of either a 180 arc of coronary calcium or nodular calcium at the target lesion on intravascular imaging prior to IVL therapy. Exclusion Criteria: 1. Significant co-morbidities: * Cardiac arrest * Cardiogenic shock * Collapse / comatose / semi-conscious states 2. Patients requiring urgent or emergent PCI. 3. Patients who are unable to provide consent. 4. Patients who are pregnant. 5. Breast-feeding women 6. Any patients whom the Investigator deems unsuitable for the study (e.g., due to other medical reasons, laboratory abnormalities, expected study medication noncompliance, or subject's unwillingness to comply with all study-related study procedures).