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.
Axial diffusion-weighted image (b = 0 sec/mm2) obtained in a 60-year-old woman shows a signal void within the inferior vena cava (arrow). Small b values will result in decreased signal of highly mobile water molecules such as occur within vessels. Such images are referred to as black-blood images due to the decreased signal of the fast-flowing blood within vessels.
