Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Area change ratio. The mid and right panels are the endocardial surface at end-diastole and systole, respectively. An area A0 is relocated and deformed to an area A1 by various wall motions including apical translation, regional rotation that causes shear strain, and longitudinal and circumferential contractions. The area change ratio is calculated as (A1 - A0) / A0.
