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.
This diagram provides a 3D illustration of a T-shaped x-ray tube trajectory. In this example, there are nine source positions in the plane of the chest wall (left-to-right), and eight additional source positions along the mid-line perpendicular to the chest wall.
