Atrioventricular Valve Regurgitation Vena Contracta; Echo Versus MRI

The purpose of this pilot study is to evaluate mitral (left atrioventricular valve) and tricuspid (right atrioventricular valve (AVV)) regurgitation using cardiac magnetic resonance imaging (CMR) as the non-invasive "gold standard" compared to transthoracic echocardiography (TTE) to evaluate measurements of the width of the regurgitation jet (vena contracta (VC)) to demonstrate the utility of the VC as a means to objectively evaluate atrioventricular valve regurgitation. In addition, feasibility and other quantitative and qualitative measures of regurgitation will be compared between CMR and TTE. * Hypothesis 1: The ability to objectively evaluate atrioventricular valve regurgitation and VC width with TTE and CMR has a high feasibility rate with acceptable intra and inter-observer variability by two independent readers. * Hypothesis 2: There will be positive correlation between the TTE measurement of the VC width and quantitative assessment of atrioventricular valve regurgitation by TTE and CMR. * Hypothesis 3: There will be a positive correlation between the quantitative measurements of atrioventricular valve regurgitation by phase contrast velocity encoded CMR with quantitative values as measured by TTE. * Hypothesis 4: There will be a positive correlation between qualitative assessment of atrioventricular valve regurgitation by CMR compared to TTE.