No need for these steps.
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This may be due to two things. The first is all the extra conversions you’re making. The second is the resolution of the CT. To mitigate the first, please just skip those steps
For the second, you can go to the Segmentations module, click on Update (or if not created yet, long-click Create) in the row of the Binary labelmap representation, and then click Set geometry. Select your CT, and then you can choose to apply oversampling, which will give you a finer labelmap. -
Again, the extra steps. By going segmentation → volume → segmentation, you limited the bounding box, of which you cannot go out, unless you specify a different geometry. By the way can you please explain why you took these specific steps? Is there some tutorial or documentation that is outdated or wrong? Please let me know.