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Fig. 1 —Schematic shows box made of square acrylic plastic sheets
that was packed in 50 variations with nine different silicone cubes and that
served as phantom for study. Each cube had surface area of 3 x 3 cm edge
length and 1.5 cm in height. Some cubes contained either round silicone
columns or holes devised to simulate masses with elevated or low density to
contrast with surroundings. Some cubes had no simulated masses.
