CAlcified Coronary Lesions Identification & Quantification With X Rays

Inclusion Criteria: * Male or female aged 18 years or older * Patient with a coronary lesion. * Angiographically calcified culprit lesion (Mintz classification) 1 Moderate: lesion with radiopaqueness noted only during the cardiac cycle before contrast injection Severe: lesion with radiopaqueness seen without cardiac motion before contrast injection, visible on both sides of the arterial lumen * Ability to traverse the culprit lesion with an IVUS catheter * Having been informed by an investigator about the research topic and having given their free, explicit, and informed consent. * Affiliation with a social security scheme (beneficiary or dependent) Exclusion Criteria: * Acute coronary syndrome of the ST-segment elevation myocardial infarction type * Progressive cardiogenic shock * Culprit lesion impassable with an IV catheter * Pregnant, parturient, or breastfeeding women and other vulnerable categories: legally incapacitated adults, adults unable to express their consent and not subject to a protective measure, persons deprived of their liberty * BMI \> 35 kg/m²