# How to align segments to each other

**URL:** <https://discourse.slicer.org/t/how-to-align-segments-to-each-other/1022>\
**Category:** Support\
**Created:** [September 7, 2017, 2:54pm UTC](https://discourse.slicer.org/t/how-to-align-segments-to-each-other/1022 "2017-09-07T14:54:44Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Hanaana](https://avatars.discourse-cdn.com/v4/letter/h/9dc877/32.png) [@Hanaana](https://discourse.slicer.org/u/Hanaana)\
**Post date:** [September 7, 2017, 2:54pm UTC](https://discourse.slicer.org/t/how-to-align-segments-to-each-other/1022/1 "2017-09-07T14:54:44Z")

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Hello everyone!!

Im trying to make some anatomical landmarks coordinates to my femur bone  
but in module registration i couldnt pick the fixed volume nor the moving  
volume.

Am i doing it wrong ?! this is the information i found about registration  
while reading about the landmark registration module :  
[https://www.slicer.org/wiki/Documentation/4.4/Modules/LandmarkRegistration](https://www.slicer.org/wiki/Documentation/4.4/Modules/LandmarkRegistration)

Am i choosing the wrong module ?! or am i doing it wrongly ?! Please  
someone to help with this issue

Hanaa

 ![](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/1X/07e028a022a93c115b9178952c2171cd388c411f.jpg)

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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:** [September 8, 2017, 1:38pm UTC](https://discourse.slicer.org/t/how-to-align-segments-to-each-other/1022/2 "2017-09-08T13:38:41Z")

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Landmark registration module in Slicer core is mainly intended for images. Install SlicerIGT extension and use `Fiducial Registration Wizard` module to align any kind of structures by dropping markup fiducials on corresponding landmarks in slice or 3D views. See U12 and U13 in [SlicerIGT tutorials](http://www.slicerigt.org/wp/user-tutorial/). If you need a model node instead of a segment, you can export your segmentation to model in the Segmentations module.

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**Author:** ![Hanaana](https://avatars.discourse-cdn.com/v4/letter/h/9dc877/32.png) [@Hanaana](https://discourse.slicer.org/u/Hanaana)\
**Post date:** [September 8, 2017, 3:09pm UTC](https://discourse.slicer.org/t/how-to-align-segments-to-each-other/1022/3 "2017-09-08T15:09:33Z")

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Hello Professor,

Thank you for the continous support . For some reasons i cannot open the  
link to download the SlicerIGT extension •[http://192.168.1.240](http://192.168.1.240) Can you  
please help me with this issue!!

Hanaa

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**Author:** ![Hanaana](https://avatars.discourse-cdn.com/v4/letter/h/9dc877/32.png) [@Hanaana](https://discourse.slicer.org/u/Hanaana)\
**Post date:** [September 8, 2017, 3:46pm UTC](https://discourse.slicer.org/t/how-to-align-segments-to-each-other/1022/4 "2017-09-08T15:46:58Z")

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Hello Professor,

I have solved it. I could download it directly from Extension manager.

Thank you,

Hanaa

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**Author:** ![deepmech](https://avatars.discourse-cdn.com/v4/letter/d/e0b2c6/32.png) [@deepmech](https://discourse.slicer.org/u/deepmech)\
**Post date:** [September 9, 2017, 4:04am UTC](https://discourse.slicer.org/t/how-to-align-segments-to-each-other/1022/5 "2017-09-09T04:04:03Z")

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hello hanaa , are you working on femur bone?  
can you send me the .stl or .iges file of femur?([deepmech.maurya@gmail.com](mailto:deepmech.maurya@gmail.com))  
i am working on sacrum and pelvic region to find out the high stresses area but …  
till now i am not able to convert .stl file to .iges file which can open in any FINITE Element software.

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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:** [September 11, 2017, 2:31am UTC](https://discourse.slicer.org/t/how-to-align-segments-to-each-other/1022/6 "2017-09-11T02:31:34Z")

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STL is a surface mesh file format, so unless you use a shell model, it won’t be usable for FEA. You usually need to create a volumetric mesh. See more details in this post: [Usage of volumetric meshes](https://discourse.slicer.org/t/usage-of-volumetric-meshes/620)