Thanks! Just trying to double check they don’t overlap. I created two volumes with exactly the same geometry as what you show in the screenshots, and they don’t match exactly, although the dose volume is inside the CT, which may be valid:
This is quite unusual if you exported them from a treatment planning system. At this point (if the dose is indeed smaller than what it’s supposed to be) it is up to you to manually fix the dose volume’s geometry so that it matches the CT.
You can use the Resample Scalar Volumes module (the same one I used to create these two volumes above).