# Elongation of segments in a 3D volume

**URL:** <https://discourse.slicer.org/t/elongation-of-segments-in-a-3d-volume/12252>\
**Category:** Support\
**Created:** [June 28, 2020, 2:40pm UTC](https://discourse.slicer.org/t/elongation-of-segments-in-a-3d-volume/12252 "2020-06-28T14:40:50Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Deepa](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/deepa/32/5634_2.png) [@Deepa](https://discourse.slicer.org/u/Deepa)\
**Post date:** [June 28, 2020, 2:40pm UTC](https://discourse.slicer.org/t/elongation-of-segments-in-a-3d-volume/12252/1 "2020-06-28T14:40:50Z")

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Hello Everyone,

I’ve a 3D volume like the following  
 ![Untitled](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/9/e/9e5aff7d06b6475433fc086522d62bd45865d1ae.png)

I would like to elongate all the vessel segments (say, by a factor of 5 times the current length).  
Is there a way to elongate the vessel segments in Slicer?

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [June 28, 2020, 4:06pm UTC](https://discourse.slicer.org/t/elongation-of-segments-in-a-3d-volume/12252/2 "2020-06-28T16:06:07Z")

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You can scale the entire segmentation along an axis by applying a linear transform in Transformation module. Scaling factors are the first three values in the diagonal matrix.

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<div class="post-metadata">

**Author:** ![Deepa](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/deepa/32/5634_2.png) [@Deepa](https://discourse.slicer.org/u/Deepa)\
**Post date:** [June 29, 2020, 4:14pm UTC](https://discourse.slicer.org/t/elongation-of-segments-in-a-3d-volume/12252/3 "2020-06-29T16:14:34Z")

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Thanks a lot . I’d like to know if scaling can alter the thickness of the vessel segments too. I’d like to scale only the lengths.

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [June 30, 2020, 3:32pm UTC](https://discourse.slicer.org/t/elongation-of-segments-in-a-3d-volume/12252/4 "2020-06-30T15:32:07Z")

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Of course, scaling affects everything. Unless all the vessels are parallel, you cannot change their lengths without affecting their thickness.

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**Author:** ![Deepa](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/deepa/32/5634_2.png) [@Deepa](https://discourse.slicer.org/u/Deepa)\
**Post date:** [June 30, 2020, 3:57pm UTC](https://discourse.slicer.org/t/elongation-of-segments-in-a-3d-volume/12252/5 "2020-06-30T15:57:53Z")

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Thanks a lot for the clarification

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**Author:** ![sandress](https://avatars.discourse-cdn.com/v4/letter/s/f475e1/32.png) [@sandress](https://discourse.slicer.org/u/sandress)\
**Post date:** [July 1, 2020, 8:14pm UTC](https://discourse.slicer.org/t/elongation-of-segments-in-a-3d-volume/12252/6 "2020-07-01T20:14:41Z")

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You can use the margin effect in the segment editor to grow or shrink your segmentation, this would affect the thickness of the vessels too.