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a) DVH (cut-off in dose range of [0 – 0.15 Gy]) of the circulating blood pool of proton (blue) and IMRT (orange) therapy after one fraction and after 30 fractions (b) in the range of [0 – 0.5 Gy]. The orange area corresponds to the differential DVH (IMRT minus proton therapy) for better illustration.
