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.
The effect of window/level. Left: large-width window covering the entire grey value range of the image, leading to poor image contrast. Middle: medium-width window covering soft-tissue and bone grey values, leading to good overall contrast. Right: small-width window with a high-level value, leading to high contrast for bone and teeth.
