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.
To determine HVL and QVL, an ionization chamber (circle) was suspended free-in-air at isocenter and sheets of 1100 aluminum alloy (arrow) were placed at the bottom of the scanner gantry covering the x-ray beam, which was held stationary at 180°.
