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The Effect of Reconstruction Algorithm on Conspicuity of Polyps in CT Colonography

¹ Department of Radiology, MC 2026, University of Chicago, 5841 S Maryland Ave., Chicago, IL 60637.
² Department of Health Studies, University of Chicago, Chicago, IL 60637.
³ GE Healthcare, Chicago, IL 60605.

View larger version (174K): [in a new window]   Fig. 1. —Example of two-by-two layout of CT colonographic images (lung window settings: width, 2,000 H and level, -600 H) obtained in 65-year-old woman with standard (upper left), lung (upper right), soft (lower left), and detail (lower right) algorithms. Compare conspicuity of normal colonic folds and background noise in four images.

View larger version (16K): [in a new window]   Fig. 2. —Graph shows final level settings for rankings of page-through data sets (black circle = data set, dotted line = default settings, bold lines = mean for each algorithm).

View larger version (12K): [in a new window]   Fig. 3. —Graph shows final window settings for rankings of page-through data sets (black circle = data set, dotted line = default settings, bold lines = mean for each algorithm).

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