# Increase Width of segments after TotalSegmentor autosegmentation
**URL:** https://discourse.slicer.org/t/increase-width-of-segments-after-totalsegmentor-autosegmentation/37018
**Category:** Support
**Tags:** segmentation, segmentations, segment-editor
**Created:** [June 25, 2024, 9:12pm UTC](https://discourse.slicer.org/t/increase-width-of-segments-after-totalsegmentor-autosegmentation/37018 "2024-06-25T21:12:57Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@waterbottle](https://discourse.slicer.org/u/waterbottle)
#### Post date: [June 25, 2024, 9:12pm UTC](https://discourse.slicer.org/t/increase-width-of-segments-after-totalsegmentor-autosegmentation/37018/1 "2024-06-25T21:12:57Z")
Hi all,
I am brand new to 3D Slicer and am using it on MRIs. I have just started learning to use totalsegmentor to automatically segment muscles, its going okay but so far there are segments I need to increase or decrease the width of across all of the slices.
From what I gather I can use the scissors tool to handle decreasing width across all slices at once but I am confused on how I can **increase the width of certain segments**. I tried to use the paint tool but it only does one slice at a time, can anyone point me in the right direction?
Much appreciated, complete rookie here.
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### Author:  [@mikebind](https://discourse.slicer.org/u/mikebind)
#### Post date: [June 25, 2024, 9:17pm UTC](https://discourse.slicer.org/t/increase-width-of-segments-after-totalsegmentor-autosegmentation/37018/2 "2024-06-25T21:17:14Z")
The Margin tool would allow you to grow a segment uniformly in all directions (in 3D). If that isn’t what you want, some screen shots and some more description of what you are trying to accomplish would be helpful.
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### Author:  [@waterbottle](https://discourse.slicer.org/u/waterbottle)
#### Post date: [June 25, 2024, 9:46pm UTC](https://discourse.slicer.org/t/increase-width-of-segments-after-totalsegmentor-autosegmentation/37018/3 "2024-06-25T21:46:46Z")
Hello, thank you for your answer! I tried the margin tool on the MRI I have open and it says “Not feasible at current resolution,” any tips or am I using it wrong?
Re: picture—this is an example, inside the red outline is what I am getting right now and I want to expand the boundries to the blue outline.
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### Author:  [@waterbottle](https://discourse.slicer.org/u/waterbottle)
#### Post date: [June 26, 2024, 12:46am UTC](https://discourse.slicer.org/t/increase-width-of-segments-after-totalsegmentor-autosegmentation/37018/4 "2024-06-26T00:46:51Z")
Margin does the trick, for anyone wondering how to resolve “not feasible” problem, check this out:
> [@How do I set segmentation resolution](https://discourse.slicer.org/t/how-do-i-set-segmentation-resolution/19068):
>
> Operating system: Windows 10 Slicer version: Slicer 4.11.20210226 Question: I am completely new to 3D Slicer. I was working on a segmentation and when trying to make it hollow, I was not able to with my desired shell thickness because it is not feasible at the current resolution. I believe I have to adjust the “master volume”, but I do not know how. Can you please tell me how I can adjust the resolution of my segmentation, and can you explain to me more about this “master volume”