Merge two 3D masks

I have a 3D mask with zero bahground and 3 labels 10 = Ventricles, 20=White matter, 30=Grey matter. I also have a 3D mask with tumour segmentation showing necrosis=1, tumor=2, edema=4.

I would like to merge these two segmentations in a single mask. Any help how to do this?

[Rik]

Do you just want to add them up? Or do you want to define new numeric labels for each unique combination?

And what have you tried yourself?

[Demy]

I have added the two metrices:

brain_mask + tumor mask

But I want to first change the values in tumor segmentation from 1, 2 and 4 to make them 50, 60 and 70 for example. And then add these two matrices

Answer 1

[Image Analyst]

Try this:

tumor_mask(tumor_mask == 1) = 50;
tumor_mask(tumor_mask == 2) = 60;
tumor_mask(tumor_mask == 4) = 70;
combinedLabeledImage = brain_mask + tumor_mask;

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