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.
Planned mid-range spots and online pre-treatment probing spots. Left: planned situation. The circles in the tumor represent the planned spots with the shaded ones indicating the mid-range spots. Right: online situation. Mid-range probing spots become anterior and posterior to the planned positions due to an unexpected bony object and air pocket, respectively, on the beam path. Nevertheless, the midrange spots remain inside the tumor, but other spots may shift outside the tumor.
