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.
Three digital phantoms investigated in this work. (a) A uniform circular disk phantom. (b) An elliptical object composed of three materials approximating water, bone, and fat. (c) A thorax approximating a realistic distribution of tissue heterogeneities. The numeric symbols (1–4) mark four locations at which the local MTF, NPS, NEQ, and detectability index were analyzed.
