Figure 2.
Regions of interest contoured on phantom image used for contrast‐to‐noise ratio calculation: the circular signal and the ring‐shaped background are centered in each insert of different electron density.
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.