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Fig. 2 —Axial multiplanar reformatted coronal and endoluminal 3D image shows mean attenuation and SD of fecal material in 63-year-old man with family history of colorectal cancer. Inset histogram shows attenuation values in Hounsfield units of tagged material (x-axis) and frequencies of measurement (y-axis). Observer placed region of interest with surface area of at least 60 mm² in largest fluid level on randomized computer-picked slice, and CT colonography software subsequently provided mean attenuation and SD.