All volumes should have the same spacing, hence resolution.
The size of the volumes should be changed accordingly, so that:
new_size = physical_size / spacing
This is done,
follow up could be to pad all the volumes to the same size for visualization purposes.
Maybe this can be done with a 2D padding only when rendering.
All volumes should have the same spacing, hence resolution. The size of the volumes should be changed accordingly, so that:
new_size = physical_size / spacing