How to perform rigid registration on 3D volumes, but apply transform on single planes?

Beginner Questions
1

Hello

I was able to perform rigid registration on 2 3D volumes and was able to apply those transforms to the 3D moving image. The results look great.

I would now however like to apply those transforms to single planes of the 3D volume, one at a time. I bet this is possible. Is there an example I can look at?

2

Extract a slice from each image and then you have either the same (3D case) or a similar (2D case) problem.

Use region of interest filter to extract a slice from 3D volume, while keeping it 3D (of thickness 1). Use ExtractImageFilter to get your slice as a 2D image.