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Scatterplot shows ratio between body mass index (kg/m2) and standard deviation (HU). r2 = 0.260, slope = 0.40 HU/kg per millimeter squared, intersection = 4.72 HU. Some exceptionally high (or low) standard deviations are due to individual body habitus (i.e., spinal spur is responsible for noisy image) or motion artifacts.
