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2. inhomogeneities
Medium can be of varying density
So if we also scale all distances with
density we solve the problem and our
method is in accordance with
O’Connor’s theorem:
When considering two media of
different densities but the same atomic
composition exposed to the same beam,
the dose at corresponding points in the
two media will be the same provided
that all geometric distances in the two
media are scaled inversely with density