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.
4D CT images for a lung case. A breathing cycle was divided into 10 equal-time phases. The reference contours were drawn on phase CT5, which is estimated to be the end expiration phase. The contours were then transformed to the rest phases using auto-contouring algorithm.
