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Representative abdominal CT scans for middle-aged group (age 50-70 y.o., indicated as ‘Y’) and old group (age 80-99 y.o., marked as ‘O’). Each ‘Y’ and ‘O’ group contains 4 subjects. Columns 1,2 show the scans with original (un-manipulated) pixel intensity, while columns 3,4 show CLAHE-enhanced images.
