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.
CT for proton beam therapy planning. (a) The primary tumor in the upper thoracic esophagus, including the left supraclavicular lymph node, was treated with 68.2 Gy in 31 fractions. Three liver metastases, S2 (b), S4 (c), and S6 (d) were treated with 66.0 Gy in 30 fractions.
