# Function for surface registration

**URL:** <https://discourse.slicer.org/t/function-for-surface-registration/1776>\
**Category:** Support\
**Created:** [January 7, 2018, 9:14pm UTC](https://discourse.slicer.org/t/function-for-surface-registration/1776 "2018-01-07T21:14:29Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![shellyverde](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/shellyverde/32/1186_2.png) [@shellyverde](https://discourse.slicer.org/u/shellyverde)\
**Post date:** [January 7, 2018, 9:14pm UTC](https://discourse.slicer.org/t/function-for-surface-registration/1776/1 "2018-01-07T21:14:29Z")

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Operating system: Windows  
Slicer version: 4.8

Hi,  
I have patient data in CT Dicom space and I am capturing points in tracker space on patient. So I need to register the patient in tracker space (with captured points) to the CT Dicom space. I couldn’t find the function for this type of registration (surface points in tracker space to model in Dicom space). Could you please advise if there is already such function?  
Thanks,  
-Shelly

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**Author:** ![shellyverde](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/shellyverde/32/1186_2.png) [@shellyverde](https://discourse.slicer.org/u/shellyverde)\
**Post date:** [January 7, 2018, 10:09pm UTC](https://discourse.slicer.org/t/function-for-surface-registration/1776/2 "2018-01-07T22:09:30Z")

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Can I use SlicerIGT ‘Fiducials-model Registration’ for it?  
Thanks,  
-Shelly

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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:** [January 8, 2018, 2:15am UTC](https://discourse.slicer.org/t/function-for-surface-registration/1776/3 "2018-01-08T02:15:26Z")

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Usually you register the patient using landmark-based registration, using Fiducial registration wizard module (in SlicerIGT extension). In special cases, when you cannot identify landmarks clearly then you may follow up on that with a surface-to-pointset registration, using Fiducials-Model registration module. See detailed step-by-step tutorials at [SlicerIGT user training page](http://www.slicerigt.org/wp/user-tutorial/).

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**Author:** ![shellyverde](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/shellyverde/32/1186_2.png) [@shellyverde](https://discourse.slicer.org/u/shellyverde)\
**Post date:** [January 8, 2018, 2:48am UTC](https://discourse.slicer.org/t/function-for-surface-registration/1776/4 "2018-01-08T02:48:01Z")

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Got it and thanks a lot for the quick reply.  
-Shelly