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.
Visibility of foreign body in air. (a) Conventional plain radiography. (b) CT. (c) Ultrasonography. 1, metal; 2, dry wood; 3, graphite; 4, Bakelite. Note that it is not possible to evaluate the foreign bodies' visibility in air with ultrasonography. For this reason, only one figure was submitted to represent all bodies.
