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Monte Carlo - D
w
vs D
m
•
MC per nature
delivers D
m
•
For higher density materials, such as cortical bone, the difference in
dose can be as large as 15%
AAPM TG Report 105
•
To use MC simulation in the
current clinical practice so
as to be able to
compare
D
m
with historical D
w
results, requires a
conversion of D
m
to D
w
for dose prescriptions,
isodose coverage, dose-
volume histograms
•
converted D
w
represents the
dose to a small volume of
water embedded in the
actual medium