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Fig. 1. Schema of P1 phantom. P1 phantom was made of six acrylic
cylinders with 3- or 4-mm inner diameters filled with contrast medium of three
dilutions. Six cylinders were fixed in columnar styrene container filled with
salad oil. Cylinders were placed parallel to central axis of styrene
container. Styrene container was fixed in water-filled columnar polyethylene
container, with central axes overlapping.