# Offline reconstruction with other devices

**URL:** <https://discourse.slicer.org/t/offline-reconstruction-with-other-devices/2523>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [April 5, 2018, 4:54pm UTC](https://discourse.slicer.org/t/offline-reconstruction-with-other-devices/2523 "2018-04-05T16:54:05Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Nolwenn](https://avatars.discourse-cdn.com/v4/letter/n/82dd89/32.png) [@Nolwenn](https://discourse.slicer.org/u/Nolwenn)\
**Post date:** [April 5, 2018, 4:54pm UTC](https://discourse.slicer.org/t/offline-reconstruction-with-other-devices/2523/1 "2018-04-05T16:54:05Z")

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Hi everyone,  
I’m a PhD student currently working on ultrasound volume reconstruction and I just found 3DSlicer/SlicerIGT. I tried the tutorials and the results are really impressive.  
I need your help for the two following issues:  
First I tried the tutorial on the elbow offline reconstruction. It is not clear to me why there is a need for a stylus in this example. I thought the stylus was used for the calibration step, but once this step is done, I do not understand why we need to compute the stylustoreference matrix.  
The second point is that I do not have the US and tracking systems that are proposed by the PLUS toolkit. Since I just a do not need a reconstruction in real time but rather an offline reconstruction, do you know if it is possible to change the configuration files so that I can compute a volume reconstruction with other devices ?  
Best regards,  
Nolwenn

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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:** [April 7, 2018, 2:36pm UTC](https://discourse.slicer.org/t/offline-reconstruction-with-other-devices/2523/2 "2018-04-07T14:36:37Z")

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> [@Nolwenn](#):
>
> First I tried the tutorial on the elbow offline reconstruction. It is not clear to me why there is a need for a stylus in this example.

It is not needed. It can be useful if you want to register the acquired ultrasound to pre-procedural images based on anatomical landmarks. [quote=“Nolwenn, post:1, topic:2523”]  
I do not have the US and tracking systems that are proposed by the PLUS toolkit.  
[/quote]

Plus can acquire ultrasound images from any scanner by using framegrabbers. What tracking system do you use?

> [@Nolwenn](#):
>
> if it is possible to change the configuration files so that I can compute a volume reconstruction with other devices

You just need to create a sequence file that contains images and transforms in this format: [Plus applications user manual: Sequence file](http://perk-software.cs.queensu.ca/plus/doc/nightly/user/FileSequenceFile.html) and run the command-line volume reconstructor tool: [Plus applications user manual: Volume reconstruction](http://perk-software.cs.queensu.ca/plus/doc/nightly/user/ProcedureVolumeReconstruction.html)

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**Author:** ![Nolwenn](https://avatars.discourse-cdn.com/v4/letter/n/82dd89/32.png) [@Nolwenn](https://discourse.slicer.org/u/Nolwenn)\
**Post date:** [April 9, 2018, 6:51am UTC](https://discourse.slicer.org/t/offline-reconstruction-with-other-devices/2523/3 "2018-04-09T06:51:09Z")

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Thank you so much for your answer !  
We have the Vicon system for the tracking and the Aixplorer (Supersonic Imagine) for the US acquisitions.  
What I do not understand is the config file which is needed for the reconstruction. Can I create one for my devices ?  
Best,