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.