Fig. 3.

Voxel size independence in FastSurferVINN. Flexible transitions between resolutions become possible by replacement of (un)pooling with our network-integrated resolution-normalization (green) after the first encoder (pre-IDB) and before the last decoder block (post-CDB). Scale transitions between the other competitive dense blocks (CDB) remain as standard MaxPool and UnPool operations. Each CDB is composed of four sequences of parametric rectified linear unit (PReLU), convolution (Conv) and batch normalization (BN). In the first two encoder blocks ((pre)-IDB), the PReLU is replaced with a BN to normalize the inputs.