Q: What is the best type of Cardiac MRI to evaluate severity of valvular regurgitation and stenosis? 

 Answer: Flow velocity encoding or phase contrast Cardiac MRI 

Flow velocity encoding Cardiac MRI directly measure blood flow and is useful for quantifying the severity of valvular regurgitation and stenosis, intra-cardiac shunt size, and the severity of arterial vascular stenosis.


Reference:

Beerbaum P, Körperich H, Barth P, et al. Noninvasive quantification of left-to-right shunt in pediatric patients: phase-contrast cine magnetic resonance imaging compared with invasive oximetry. Circulation 2001; 103:2476.