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Fig. 4 —Air-distended colon segment placed in dedicated 20 x 30
cm acrylic phantom box. Phantom box had diameter and form of abdominal
transverse cross section and was filled with water to simulate abdominal
attenuation. To ensure specimen was totally surrounded by water, an acrylic
plate was fixed horizontally in upper third of height to keep air-distended
colon segment from buoyancy in center of box.
