Hello, I was wondering the following: 1. On the BraTS website is says that the expert segmentations are verified by certified expert radiologists but how many expert radiologists? Is there a number or a range? 2. I have put all the training data in my brain segmentation algorithm and I got an average dice score of 0.38 . Could there be difference between radiologists how they are segmenting tumors? Is there a procedure that they follow or do they all segment based on their knowledge and experience? Because if that would be the case, a lower dice score would be logical... I hope someone can help me with my questions. Thanks in advance. Simeon