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.
Representative masked original (top), registered (middle), and proton signal difference (bottom) maps at the top diaphragm level from a healthy volunteer at RV, FRC, FRC+1 L, and TLC. Data are expressed as percentage of the mean heart signal. Color spectra are expressed in arbitrary units (a.u.).
