Inclusion Criteria:  Age ≥ 18 years old, Patient referred for cardiac MRI who previously underwent right heart catheterization for pulmonary hypertension assessment, Affiliation to a social security program, Ability of the subject to understand and express opposition  Exclusion Criteria:  Age <18 years old, Major obesity (> 140 kg) not allowing the patient to enter the tunnel of the machine whose diameter is less than 70 cm, Person under guardianship or curators, Pregnant woman, Allergy to gadolinium chelates, Claustrophobia, Any contraindications to MRI