Petascale neural circuit reconstruction: automated methods
Macrina, T.; Lee, K.; Lu, R.; Turner, N. L.; Wu, J.; Popovych, S.; Silversmith, W. W.; Kemnitz, N.; Bae, J. A.; Castro, M. A.; Dorkenwald, S.; Halageri, A.; Jia, Z.; Jordan, C.; Li, K.; Mitchell, E.; Mondal, S. S.; Mu, S.; Nehoran, B.; Wong, W.; Yu, S.-c.; Bodor, A. L.; Brittain, D.; Buchanan, J.; Bumbarger, D. J.; Cobos, E.; Collman, F.; Elabbady, L.; Fahey, P. G.; Froudarakis, E.; Kapner, D.; Kinn, S.; Mahalingam, G.; Papadopoulos, S.; Patel, S.; Schneider-Mizell, C. M.; Sinz, F. H.; Takeno, M.; Torres, R.; Yin, W.; Pitkow, X.; Reimer, J.; Tolias, A. S.; Reid, R. C.; Macarico da Costa, N.; S
Show abstract
3D electron microscopy (EM) has been successful at mapping invertebrate nervous systems, but the approach has been limited to small chunks of mammalian brains. To scale up to larger volumes, we have built a computational pipeline for processing petascale image datasets acquired by serial section EM, a popular form of 3D EM. The pipeline employs convolutional nets to compute the nonsmooth transformations required to align images of serial sections containing numerous cracks and folds, detect neuronal boundaries, label voxels as axon, dendrite, soma, and other semantic categories, and detect synapses and assign them to presynaptic and postsynaptic segments. The output of neuronal boundary detection is segmented by mean affinity agglomeration with semantic and size constraints. Pipeline operations are implemented by leveraging distributed and cloud computing. Intermediate results of the pipeline are held in cloud storage, and can be effortlessly viewed as images, which aids debugging. We applied the pipeline to create an automated reconstruction of an EM image volume spanning four visual cortical areas of a mouse brain. Code for the pipeline is publicly available, as is the reconstructed volume.
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