Detection of Amyloid Deposits in the Wrist by MRI With Mapping and High Resolution Sequences in Systemic Amyloidosis (AMYLOCARP)

Inclusion Criteria: Patient group: * Woman or man over 18 years old * With ATTR or AL cardiac amyloidosis with or without carpal tunnel. The diagnosis of amyloidosis must be proven by a positive myocardial biopsy or diphosphonate scintigraphy. * Affiliate or beneficiarie of a social security scheme. * Having signed the free and informed consent. Healthy volunteers: * Woman or man over 18 years old * Affiliate or beneficiarie of a social security scheme. * Having signed the free and informed consent. Exclusion Criteria: Patient group: * Patients participating in another clinical study. * Patients suffering from rheumatoid arthritis or other autoimmune disease (vasculitis, lupus, scleroderma, etc.) * Patients with a medical history of wrist surgery (exclude the operated side). * Patients with a contraindication to performing an MRI (pacemaker, etc.) * Pregnant or breastfeeding women. * Protected patients: Adults under guardianship, curatorship or other legal protection, deprived of their liberty by judicial or administrative decision. Healthy volunteer: * Volunteers participating in another clinical study. * Volunteers suffering from rheumatoid arthritis or other autoimmune disease (vasculitis, lupus, scleroderma, etc.) * Pregnant or breastfeeding women. * Volunteer with a contraindication to performing an MRI (pacemaker, etc.) * Protected volunteers: Adults under guardianship, guardianship or other legal protection, deprived of their liberty by judicial or administrative decision.