Fig. 2.

Box plots of the spatial overlap among experts (EX) and novices (NO) measured as generalized conformity index for enhancing tumor and non-enhancing tumor segmentations of 20 glioblastoma and 20 non-glioblastoma patients in MRIs taken at preoperative, postoperative and progression time points. Each dot represents the agreement among raters for one patient's MRI. Indices above 0.7 are considered excellent. The median of measurements and interquartile distances are plotted as boxes, which were omitted when fewer than five data points were present. Few data points were available for enhancing tumor segmentations in non-glioblastoma, because the generalized conformity index could not be calculated when fewer than two observers detected tumor.