Efficacy of [18F]Florbetaben PET for Diagnosis of Cardiac AL Amyloidosis

Inclusion Criteria: * Males and females age ≥18 years * Able to understand, sign and date written informed consent * Written informed consent must be obtained before any study procedures are performed * Subjects being considered for a possible diagnosis of cardiac amyloidosis by * 1\. One of the following conditions: * Established systemic amyloidosis without proven cardiac involvement, * Known plasma cell dyscrasia (MGUS, multiple myeloma), * Pathological free light chain levels in urine or serum, * Presence of heart failure with preserved ejection fraction * 2\. AND one of the following parameters, indicative of cardiac manifestation: * Mean (left ventricular (LV) wall + septum) thickness \>12mm as measured by echocardiography or CMR in absence of other known cause of left ventricular hypertrophy (LVH), * NT-proBNP \>335 ng/L (in case a value for NT-proBNP is not available, BNP \> 81ng/L may be used instead) * Planned diagnostic procedure to establish diagnosis and cardiac involvement (e.g., endomyocardial biopsy or extracardiac biopsy in conjunction with cardiac magnetic resonance imaging/echocardiography or bone scintigraphy) * Female subjects must be documented by medical records or physician's note to be either surgically sterile (by means of hysterectomy, bilateral salpingectomy, or bilateral oophorectomy) or post-menopausal for at least 1 year (no menses for 12 months without an alternative medical cause). If they are of child-bearing potential, they mu…