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. 2014 Feb 24;41(3):031908. doi: 10.1118/1.4865788

FIG. 1.

FIG. 1.

(a) and (b) Cross-section images of the Catphan 504 phantom at nominal thickness (left, a) and with ring (right, b). (c) Catphan spatial resolution module (CTP528). The line pair objects are oriented in a circular fashion. (d) MTF bead with an indication of the finite bead diameter. (e) Catphan low contrast resolution module (CTP515). The low contrast objects are oriented in a circular fashion. The 1.0% low contrast object ROI is shown on the right and the background ROI is shown on the left. (f) Catphan uniformity module (CTP486-2). ROIs were generated at the center and each of the four cardinal directions to evaluate uniformity. (g) Catphan sensitometry module (CTP404). Each ROI was generated in the center of the insert with an 8 mm diameter. The insert materials are listed adjacent to the insert.