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Detection sensitivities at six radiation dose levels in the outer region for simulated nodules of −800 Hounsfield units (HU) with diameters of 5 mm (a), 8 mm (b) and 10 mm (c), and of −630 HU with diameters of 5 mm (d), 8 mm (e) and 10 mm (f) are demonstrated. Black and grey bar graphs stand for the mean value for 10 observers by iterative reconstruction and filtered back projection algorithm, respectively.
