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Recurrence density as no. of recurrences per cm3 for target (sub)volumes with 95% CI. Colors indicate radiation dose levels, red: 66/68 Gy, green: 60 Gy, and blue: 50 Gy. If the risk of a local recurrence in a specific sub-region had been independent of the relative FDG SUV, the densities from 50% SUVmax to 90% SUVmax should have been constant.
