<qa>  What is the gold standard method of assessing cardiac volumes, function and mass?CMR is the gold-standard method of assessing cardiac volumes, function and mass. Its unique strength over other imaging modalities is tissue characterization with and without the use of contrast agents. Myocardial iron is detected due to the effects on relaxation times through the interaction of iron with hydrogen nuclei in normal cardiac tissue. Cobalt is a ferromagnetic metal containing unpaired electrons allowing it to align in parallel to applied magnetic fields, and therefore should be detected by MRI in a similar way to iron. 