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) LP test object with 5 LP/mm, 3.33 LP/mm, 2.5 LP/mm, and 2 LP/mm (top to bottom) and vertical shifts (left to right). (b) Example reconstructed DBT slice with embedded LP test object. (c) Illustration of LP contrast calculation (gray area: bar regions; yellow area: space regions).
