Question regarding masked registration with different shapes

Beginner Questions
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1

Heya,

I’m wondering how the sampling works when performing registration with masks.
In the elastix manual its written its sufficient to provide a image for the fixed image when there is no severe noise in the moving image ROI area.

What I’m confused about, is that the mask for the fixed image that i provide contains less channels/slices than my fixed image, but it still works.
For example when having 2 3D volumes and a mask matching the dimensions of the moving image:
fixed image: 100x10x10
moving image: 50x10x10
mask: 50x10x10

So how are samples drawn when the masks for the fixed image has less channels (or more) than the fixed image itself.

I’d be very thankful for any insights!

2

Hello @kenrickmoke,

This has to do with a fundamental concept of ITK, images occupy a physical/continuous region in space. For more details, see discussion in this post.

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