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The accuracy of two calculation algorithms of the Eclipse 8.9 treatment planning system (TPS)—the anisotropic analytic algorithm (AAA) and pencil-beam convolution (PBC)—in modeling the enhanced dynamic wedge (EDW) was investigated. Measurements were carried out for 6 and 18 MV photon beams using a 2D ionization chamber array. Accuracy of the TPS was evaluated using a gamma index analysis with the...