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.
Failure rates for each parameter of CT phantom image testing in 2005 and 2006. Spatial resolution was most commonly failed parameter in 2005 and 2006. Failure due to artifacts markedly increased in 2006. Number of cases that failed for low contrast resolution, alignment, image uniformity and CT number of water decreased in 2006.
