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Fig. 1 Diagram shows configuration of flow phantom. Phantom was composed of
plastic cistern, pump, flow meter, acrylic hollow cylinder filled with water,
hermetic metallic tank, and connecting tubes; 5.5 L of water is circulated by
pump through flow phantom. Flow rate of pump was set at 5.5 L/min, a rate
equivalent to cardiac output flow rate in a human weighing 60 kg. Contrast
material is injected into cistern with power injector. CT was performed at
acrylic hollow cylinder.