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Fig. 1. —Spot radiograph shows polyethylene tubes (inner diameter, 0.09 cm) filled with (left to right) 100% weight/volume (wt/vol) barium suspension, 50% wt/vol barium suspension, and iodinated aqueous contrast agent. Exposure parameters are automatic exposure, 3 mAs at 70 kV; small focal spot; smallest field of view. Below, CT scans of 100% wt/vol barium suspension, 50% wt/vol barium suspension, and iodinated aqueous contrast agent are presented also showing regions of interest used for determination of respective CT densities.