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.
A typical reconstructed axial image of the Zubal phantom with (a) the original flat filtration, (b) the bowtie filtration and (c) comparison of a selected line profile across the image. The line in (a) and (b) indicates the position of the profile, and the dashed circles in (c) indicate the selected region for use in contrast-to-noise ratio calculation. Arrows indicate the flat and bowtie filtrations.
