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Boxplot showing distribution of the HU value after scanner recalibration of all kVp and mGy settings, mapped to a single energy of 80 keV, plotted by vendor. Foams 1 to 3 are the reference foams, and the lung foam is the foam backing that fills the entire phantom. The lung foam did not participate in the calibration fit, and therefore serves as a test case to assess the variation.
