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.
Profile through tumor phantom reconstruction. The line profile passes through the spheres and center structure from the 8 o'clock position to the 2 o'clock position. Note the improved contrast and resolution at the smallest tumor and cold water sphere when the half-ring insert was used (indicated by arrows).
