294 / 1542
34
Why Monte Carlo Treatment Planning?
Accuracy
Dose calculation should be
accurate within 2% to 3%
MC dose calculation engines can
be even more exact than 3%
Regardless of the treatment setup
Uncertainties and Causes
Imperfect matching of the MC
beam to the Linac
within 1%
Uncertainties in the cross section
libraries
negligible
Limited number of simulated
‘events’
~number of histories
Uncertainties in the conversion of
CT data to the material
composition and density
difficult
to quantify
0
20
40
60
80
100
120
0
100
200
Depth (mm)
Dose (%)
Measurement
Monte Carlo
EPL
Hol (2008)