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Lung Nodule Size

These articles describe human observers' ability to distinguish visually whether two disk added to CT noise were of different sizes.
1986 Size Discrimination of Features on CT Images
1988 Size Discrimination in CT images: Effects of Feature Contrast and Display Window

These presentations evaluated size measurement reliability of nodules using CT images. Both human visual and computer measurements were evaluated.  A phantom of with acrylic balls and cubes imbedded in lung like foam was the primary tool.  The size of image features persistently reported as nodules in screening CT images were also evaluated.