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Comparison of the amount of noise between FBP and AIDR for object variations at (a) 135 kVp, (b) 120 kVp, (c) 100 kVp, and (d) 80 kVp. Labeled number are as follows: 1 for the air object, 2 for the polypropylene object, 3 for the nylon object, 4 for the acrylic object, and 5 for the Delrin object.
