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.
The volume of RLNs (in green), which was separated from primary nasopharynx tumor (in red), was both delineated on the planning system according to the pretreatment contrast axial T1-weighted MRI (B,D) and CT fused images (A,C). RLN, retropharyngeal lymph node.
