Advanced Physics for Brachytherapy 2018

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