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Phantom setup. A 35 × 26 cm2 torso-shaped phantom filled with water was used to simulate the abdomen of an average-sized patient. Three rods with different diameters (small: 3 mm; medium: 5 mm; large: 9 mm) were placed in the center region of the water tank (arrows). The acrylic resolution target was used only to hold the rods in position and was not included in the evaluated images.
