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Fig. 4. —Diagram shows rotational scheme of 24 phantoms used during data acquisition. R1, R2, and R3 refer to radiologists 1, 2, and 3, respectively. Colon phantoms are displayed as rectangular boxes. The reference number of phantom used to acquire data for a given sequence is indicated in the left subsection of each box. The numbers in the right subsection refer to the number of polyps in size groups X, Y, and Z, respectively. For each scan sequence, the number of polyps in each size group was kept constant and equal to 20. No radiologist examined the same phantom twice with the scheme, and all radiologists had examined all 24 phantoms after completion of the study.