Combining segmentations offers a robust approach to object segmentation in PET. Both MJV and STAPLE improved accuracy and were robust against the widely varying performance of individual segmentation methods. Differences between MJV and STAPLE are such that either offers good performance when combining volumes. Neither method requires a training dataset but MJV is simpler to interpret, easy to implement and fast.
McGurk, R. J., Bowsher, J., Lee, J., & Das, S. K. (2013). Combining multiple FDG-PET radiotherapy target segmentation methods to reduce the effect of variable performance of individual segmentation methods. Medical Physics, 40(4), 42501. https://doi.org/10.1118/1.4793721 (Original work published 2013)