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Fig. 17A. —Three scatterplots showing attenuation of early-enhanced CT images of adenomas and nonadenomas at different times after injection of contrast material. No statistical differences were indicated. (Reprinted with permission from [15]) Scatterplots show data at different time intervals: 30, 60, and 90 sec (A); 180 sec only (B); and 30 min only (C). Because y-axis scales are changed for each part, this presentation visually suggests that discrimination between groups is noted at 30 min. Parts B and C should have also been plotted with attenuation versus all times of observation to reduce redundancy and nondata ink.





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