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.
Mathematical model used to estimate random errors in isocenter coordinates because of motion of the radio‐opaque markers (BBs) during the scan. (A) Two degrees of freedom are used for every BB. (B) The standard deviation of the motion of a single BB in a given direction is calculated based on the standard deviation of the distance in anterior– posterior (AP) direction between the two lateral BBs.
