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CT images of the contrast-rod slice of the Catphan©600 phantom. The numbered materials are as follows: [1] aluminum, [2] acrylic, [3] Delrin, [4] Teflon, [5] air, [6] polymethylpentene, [7] low density polyethylene (LDPE), and [8] polystyrene. Display window: [−500 1000] HU.
