# Sequence Browsing: Loss of Spatial Movement After Saving in Slicer

**URL:** <https://discourse.slicer.org/t/sequence-browsing-loss-of-spatial-movement-after-saving-in-slicer/42369>\
**Category:** Support\
**Tags:** surgical-navigation\
**Created:** [March 30, 2025, 4:53am UTC](https://discourse.slicer.org/t/sequence-browsing-loss-of-spatial-movement-after-saving-in-slicer/42369 "2025-03-30T04:53:28Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![rcpr](https://avatars.discourse-cdn.com/v4/letter/r/90db22/32.png) [@rcpr](https://discourse.slicer.org/u/rcpr)\
**Post date:** [March 30, 2025, 4:53am UTC](https://discourse.slicer.org/t/sequence-browsing-loss-of-spatial-movement-after-saving-in-slicer/42369/1 "2025-03-30T04:53:28Z")

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Hi everyone!  
First of all, I’d like to thank you for your availability!

I’m using fCal to receive ultrasound images from a frame grabber while simultaneously acquiring spatial information from the sensor attached to the probe (I’m using the Aurora motion tracking system). After performing the calibrations, I used the Plus Server to stream the **TrackedVideoStream** channel, where I sent **Name=“Image”** with **EmbeddedTransformToFrame=“Tracker”**.

To perform the reconstructions in Slicer, I recorded the frames over time using the Sequence Browsing module and then proceeded with the reconstruction. The problem is that when I save the sequence for later visualization, upon reloading it in Slicer, I can no longer see the frames moving spatially. I only get a static spatial frame, although the images are being updated. However, when I record the sequence in real-time and then click on the sequence visualization, it does move through the 3D space.

Am I doing something wrong?  
I would really appreciate any help!

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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:** [March 31, 2025, 8:13pm UTC](https://discourse.slicer.org/t/sequence-browsing-loss-of-spatial-movement-after-saving-in-slicer/42369/2 "2025-03-31T20:13:00Z")

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Can you share a sample data set (upload somewhere and post the link here)?

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**Author:** ![rcpr](https://avatars.discourse-cdn.com/v4/letter/r/90db22/32.png) [@rcpr](https://discourse.slicer.org/u/rcpr)\
**Post date:** [April 1, 2025, 5:19pm UTC](https://discourse.slicer.org/t/sequence-browsing-loss-of-spatial-movement-after-saving-in-slicer/42369/3 "2025-04-01T17:19:03Z")

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Good afternoon! Thank you for your quick response!  
In the meantime, I managed to understand what my mistake was, but another question came up. Is it possible to define a 2D window to crop each frame individually, instead of using a 3D region of interest?  
This is because when I use the Crop Volume Sequence module, I end up defining a 3D region that captures areas that are not of interest, while also missing areas that should be included, as the frames are not static (since it is a freehand scan). Is there a way to achieve this? Something that would allow me to apply a crop directly to the image received from the Plus server, so I can then work with the region of interest only for the sequence recording?  
Thank you so much for your help!