With version 4.7, I added some calculators for regurgitant fraction and effective regurgitant orifice area. Find these calculators under Valves → Native Valves → AI, MR, TR, or PI, and then click on the calculator icon at the top right. Here’s an example (red box) on the mitral regurgitation page.
Happy scanning, and thank you as always for your support of EchoTools! 🙂