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Eclipse from Varian
For the lateral scaling, a discretization in 16 perpendicular directions is used
and for each an equivalent path length is determined.
While the variable lateral scatter considerations improve the algorithm
performance in lung, it does not change the fact that the medium is still
uniformly considered water-equivalent and the dose is thus reported to
water.
Different heterogeneities can be modified as scaled water, thus
April 2017
27
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Equations from Varian’s Eclipse Physics course