# 3D freehand ultrasound - saving data using sequences

**URL:** <https://discourse.slicer.org/t/3d-freehand-ultrasound-saving-data-using-sequences/14155>\
**Category:** Support\
**Tags:** ultrasound, slicerigt\
**Created:** [October 20, 2020, 9:26am UTC](https://discourse.slicer.org/t/3d-freehand-ultrasound-saving-data-using-sequences/14155 "2020-10-20T09:26:42Z")\
**Posts on this page:** 1\
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**Author:** ![Sunderlandkyl](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sunderlandkyl/32/79987_2.png) [@Sunderlandkyl](https://discourse.slicer.org/u/Sunderlandkyl)\
**Post date:** [October 20, 2020, 2:07pm UTC](https://discourse.slicer.org/t/3d-freehand-ultrasound-saving-data-using-sequences/14155/2 "2020-10-20T14:07:42Z")

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Unfortunately 3D Slicer does not save the IJKToRAS transform for recorded volume sequence, so you will lose the ImageToReference tracking information if you save a recording of Image\_Reference. A workaround is to send the ImageToReference transform separately and send the image using EmbeddedTransformToFrame=“Image”. You will also have to record the ImageToReference transform. Using a scene with the transforms already set up is fine.

For U32 and U33, you should record/reconstruct the ultrasound entirely in Plus. The PlusRemote module in SlicerOpenIGTLink can be used to control the recording and volume reconstruction over OpenIGTLink.

This isn’t a part of the tutorial, but you might also be interested to know that the SlicerIGSIO extension can reconstruct volumes from a sequence or in real-time from within Slicer: [Real-time 3D ultrasound volume reconstruction using SlicerIGT extension](https://discourse.slicer.org/t/real-time-3d-ultrasound-volume-reconstruction-using-slicerigt-extension/11197/2)

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