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Energy deposition maps calculated with the PBA (a) and GATE (b) and gamma map index (c) for a 240‐ MeV proton beam and 1.5‐T field in a lateral heterogeneous phantom. A nonmatching region between the two characteristic Bragg peaks is observed from the gamma index plot. Dashed lines indicate the slab location inside the phantom. [Color figure can be viewed at http://wileyonlinelibrary.com]
