crop same center

[sharonlee12]

hello!I would like to make the same crop change to N 3D-images（RandCropByPosNegLabeld）. What should I do? should I concatenate them? On which channel is the concatenation made? Hope to receive everyone's reply！

[KumoLiu]

Hi @sharonlee12, to do a deterministic crop, using SpatialCrop instead of RandCropByPosNegLabeld.

MONAI/monai/transforms/croppad/array.py

Line 443 in ab4bd43

class SpatialCrop(Crop):

And you can find data shape assumption here:
https://github.com/Project-MONAI/MONAI/wiki/MONAI-Data-Shape-Assumption

Hope it helps, thanks.