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Comparison of HU values of images between FBP and AIDR for voltage variations that 1 is for the voltage of 135 kVp, 2 is for the voltage of 120 kVp, 3 is for the voltage of 100 kVp and 4 is for the voltage of 80 kVp. (a) On polypropylene objects, (b) on nylon objects, (c) on acrylic objects (PMMA), and (d) on Delrin objects.
