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Top: Measured activity obtained from FBP of the entire data acquisition for the 2 Gy irradiation of the inhomogeneous phantom consisting of PMMA, bone equivalent, PMMA, lung equivalent and PMMA slabs along the beam path (from top to bottom). A median filter over 7-by-7 neighborhood voxels was applied to reduce statistical noise. Bottom: Corresponding MC prediction. Green lines mark the position of the depth profiles of Fig. 10.
