Inclusion Criteria:  Patient over 18 years old Having an indication for a diagnostic of right cardiac catheterization at the J Cartier Hospital for one of the following pathologies: dilated, restrictive cardiomyopathy, pulmonary arterial hypertension, chronic constrictive pericarditis, chronic post-embolic pulmonary heart. Subject affiliated or beneficiary of a social security scheme Patient having freely signed the informed consent.  Exclusion Criteria:  Pregnancy (declarative, known pregnancy, any unexplained period delay in a woman of childbearing age) Presence of a contraindication to MRI: intraocular metallic splinter, surgical clip for cerebral aneurysm, claustrophobia, defibrillator, implanted electronic equipment) or to gadolinium chelates (anaphylactic reactions to gadolinium chelates, creatinine clearance <= 30 ml / min). Protected patients: Adults under guardianship, curatorship or other legal protection, deprived of their liberty by judicial or administrative decision; Pregnant, breastfeeding or parturient woman; Hospitalized without consent. Patient participating in another clinical study