IMRT 2018

Definition(of(the(set+up(deviation

The systematic part Σ:

The random part σ:

• Constant throughout the treatment • Defined as the mean position minus the planned position

• Vary from fraction to fraction • Defined as the the standard deviation

Σ XX(XXX XX( XxxXX (X X(XxxX

X X(X X(XXX(XX σ

XX(XXX(XX XX(X

X(XX X(X