# Limited Fast marching range

**URL:** <https://discourse.slicer.org/t/limited-fast-marching-range/7176>\
**Category:** Support\
**Created:** [June 15, 2019, 12:20pm UTC](https://discourse.slicer.org/t/limited-fast-marching-range/7176 "2019-06-15T12:20:27Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Amine](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/amine/32/4844_2.png) [@Amine](https://discourse.slicer.org/u/Amine)\
**Post date:** [June 15, 2019, 12:20pm UTC](https://discourse.slicer.org/t/limited-fast-marching-range/7176/1 "2019-06-15T12:20:27Z")

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Windows 10  
Tried on Slicer 4.10.1 and 4.11

For this particular volume Fastmarching gets limited by an upper and lower limit ( i run it at a high “max volume” to better show its limits).

Already tried:  
-Make sure the master volume is correct (there is only one)  
-Node contains only one scalar volume  
-No segment masking involved

Painting and Thresholding on the other hand cover the whole volume.  
Here is a link to the volume:  
[https://drive.google.com/open?id=1HWnVEwjbAXzBJxVRid6F8Cg4CYsBHSxJ](https://drive.google.com/open?id=1HWnVEwjbAXzBJxVRid6F8Cg4CYsBHSxJ)

![Capture](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/a/6/a65a1bc62c1faf3f3cd788811c834d0f464bf7dd.png)

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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 15, 2019, 3:01pm UTC](https://discourse.slicer.org/t/limited-fast-marching-range/7176/2 "2019-06-15T15:01:11Z")

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Fast Marching effect requires availability of a 4-voxel neighborhood of segmented voxels, which is not valid at the volume boundary. You can expand the volume using “Crop volume” module and enlarge the clipping ROI box to add a black boundary around the original image.

However, I would recommend to try the much more powerful and flexible “Grow from seeds” effect instead.

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<div class="post-metadata">

**Author:** ![Amine](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/amine/32/4844_2.png) [@Amine](https://discourse.slicer.org/u/Amine)\
**Post date:** [June 16, 2019, 12:36am UTC](https://discourse.slicer.org/t/limited-fast-marching-range/7176/3 "2019-06-16T00:36:03Z")

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Thanks for your reply, very informative.  
As to why i still turn back to Fastmarching sometimes, is the possibility to examine the expansion in real time via the “segment volume” slider, while grow from seeds require editing and updating the effect takes longer.