# Unknown Transformation - Canon 3D Ultrasound

**URL:** <https://discourse.slicer.org/t/unknown-transformation-canon-3d-ultrasound/44046>\
**Category:** Support\
**Created:** [August 11, 2025, 4:09pm UTC](https://discourse.slicer.org/t/unknown-transformation-canon-3d-ultrasound/44046 "2025-08-11T16:09:04Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Adam\_Mcarthur](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/adam_mcarthur/32/66454_2.png) [@Adam\_Mcarthur](https://discourse.slicer.org/u/Adam_Mcarthur)\
**Post date:** [August 11, 2025, 4:09pm UTC](https://discourse.slicer.org/t/unknown-transformation-canon-3d-ultrasound/44046/1 "2025-08-11T16:09:04Z")

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Hey Folks,

I am trying to get the 3D Volume from proprietary Canon 3D Ultrasounds. I have made a lot of progress, using a custom version of [RawImageGuess](https://discourse.slicer.org/t/new-extension-rawimageguess-for-loading-of-images-from-unrecognized-file-format/9219). I have got pretty far, but am stuck with this specific problem:

[https://files.mcaq.me/h32c2.mp4](https://files.mcaq.me/h32c2.mp4)

I am not sure how to correct for the “stair-like” effect of the images, they are not tiled 100%. Does anyone recognise what this is and what operation I need to correct for it?

Cheers!

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<div class="post-metadata">

**Author:** ![Adam\_Mcarthur](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/adam_mcarthur/32/66454_2.png) [@Adam\_Mcarthur](https://discourse.slicer.org/u/Adam_Mcarthur)\
**Post date:** [August 11, 2025, 6:09pm UTC](https://discourse.slicer.org/t/unknown-transformation-canon-3d-ultrasound/44046/4 "2025-08-11T18:09:40Z")

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I have gotten pretty far now, I just need to know how to correctly implement this “curving” transformation. Any ideas?

[![](https://files.mcaq.me/cka29.png) ](https://files.mcaq.me/cka29.png)