Figure 3
From: Accuracy of facial skeletal surfaces segmented from CT and CBCT radiographs
Box plots showing the intra- and inter-operator differences in visually defined facial surface segmentation threshold values for radiographic volumes. Outliers are shown as black circles (further from the median more than 1.5 times the IQR). A difference of 10 in threshold values corresponds to 0.25% of the full range of voxel values of the CT images, 0.22% of the Newtom images, and 0.29% of the Planmeca images.
