Reliability of 3D image analysis and influence of contrast medium administration on measurement of Hounsfield unit values of the proximal femur
Fig 4
Bland–Altman comparisons of data derived from pre- and postcontrast enhancement CT scans.
Bland–Altman plots for measurement of the HUHAfat (A), the HUHAdense-bone (B), and the mean HU (C) show mean differences with contrast agent administration. Differences (y-axis) are plotted against mean values (x-axis). Solid blue lines indicate mean differences. The top and bottom dashed lines are the upper and lower margins of the 95% limits of agreement. At a probability of 95%, differences in the normalized scores lie between the upper and lower limits (mean ± variability estimate = 1.96 standard deviations [SDs]).