In MR quantification by PISA, what does the flow convergence radius r represent?

• A. Radius r is the radius of LVOT.
• B. Radius r is the flow convergence radius measured at the aliasing velocity.
• C. Hem ispheric flow convergence radius r measured at the aliasing velocity; used to compute EROA.
• D. Radius r is the radius of the regurgitant jet.

Answer: (B)