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(a) Difference between the ACT NEQ measured using an acrylic phantom and the NEQ in Fig. 5a, which were measured using a water phantom of the same size. (b) Difference between the DPC-CT NEQ measured using the acrylic phantom and that measured by the water phantom [Fig. 5b]. (c) shows line profiles of the NEQ along f as a function of contrast mechanisms and phantom materials.
