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.
Example of a hierarchical classification tree for labeling radiographic images of the “Ankle” showing the increase in number of classes with each level. Level 1: anatomy level; level 2: laterality level (n = 2); level 3: projection level (n = 6); and level 4: detailed level
