# \#subtraction

**URL:** https://discourse.slicer.org/tag/subtraction/72.md

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## [Problems in subtracting 2 segmentations](https://discourse.slicer.org/t/problems-in-subtracting-2-segmentations/33729)

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**Author:** [@Inka\_Saraswati](https://discourse.slicer.org/u/Inka_Saraswati)\
**Replies:** 0\
**Last updated:** [January 11, 2024, 8:26am UTC](https://discourse.slicer.org/t/problems-in-subtracting-2-segmentations/33729 "2024-01-11T08:26:08Z")

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Hi, all. My case is a cleft lip and palate scan. My goal is to find volume of the bony defect by subtracting the original skull and its mirrored skull. My data looks as below. I know it’s confusing but what matters are j…

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## [Scalar subtraction](https://discourse.slicer.org/t/scalar-subtraction/4401)

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**Author:** [@lemonade](https://discourse.slicer.org/u/lemonade)\
**Replies:** 2\
**Last updated:** [October 15, 2018, 7:39pm UTC](https://discourse.slicer.org/t/scalar-subtraction/4401 "2018-10-15T19:39:50Z")

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Hello. I am subtracting two images to track changes in contrast between them. I am interested in both the positive and negative change. However I can’t seem to get any values below 0 after subtraction. Is there somethin…

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## [Subtract baseline scan](https://discourse.slicer.org/t/subtract-baseline-scan/1113)

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**Author:** [@mitenp](https://discourse.slicer.org/u/mitenp)\
**Replies:** 10\
**Last updated:** [September 29, 2017, 12:31am UTC](https://discourse.slicer.org/t/subtract-baseline-scan/1113 "2017-09-29T00:31:03Z")

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Hi, We have imaged a mouse before and after injecting a vascular contrast agent. Looking to subtract the before-scan to eliminate the skeletal structure and amplify the arteries for segmentation Tried the subtraction …