Subsequently, a series of investigations revealed a very high accuracy of 18F-florbetapir, 18F-florbetapen and 11C-Pittsburgh compound B for the detection of amyloid in the heart.11–18 Notably, AL patients exhibited a higher myocardial tracer activity than ATTR, indicating a different binding mechanism and distinct biologic properties of ATTR and AL amyloid. The gene discussed is TTR; the disease is axial length measurement.