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Sampling
• The true volume can be
approximated by the ratio of
number of points falling inside
relative to outside
N V
Random Sampling
-
DVH can be constructed from set of randomly distributed dose points
in the VOI
- Sample fewer voxels to get equivalent accuracy
Grid Sampling
Utrecht 2016
0
0
N V
=
0
0
.
N
N
VV
=
OMP – all dose voxels sampled
Eclipse – Grid and interpolation
ERGO++ - random sampling
Med Phys 1990