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.
(A) Pattern I: Rapid wash-in followed by the washout phase. (B) Pattern II: Rapid wash-in followed by a plateau after the peak enhancement. (C) Pattern III: Delayed wash-in and prolonged enhancement.
