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 standard UST sound speed image (A); The same image after it has been masked to separate it from the background water (B); The masked image segmented into dense and non-dense tissue using the k-means clustering method (C); The masked image segmented into dense and non-dense tissue using the threshold method (D).
