# \#itk-elastix

**URL:** https://discourse.itk.org/tag/itk-elastix/251.md

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## [Different BSpline fixed-parameters for equal-sized images?](https://discourse.itk.org/t/different-bspline-fixed-parameters-for-equal-sized-images/7768)

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**Author:** [@reox](https://discourse.itk.org/u/reox)\
**Replies:** 6\
**Last updated:** [June 9, 2026, 6:51am UTC](https://discourse.itk.org/t/different-bspline-fixed-parameters-for-equal-sized-images/7768 "2026-06-09T06:51:07Z")

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I started with a very simple registration pipeline, basically like this: import itk fixed\_image = itk.imread('fixed.mhd', itk.F) moving\_image = itk.imread('moving.mhd', itk.F) fixed\_mask = itk.imread("fixed\_mask.mhd",…

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## [~8x slower registration with itk-elastix Python API vs elastix CLI — minimal reproducible example](https://discourse.itk.org/t/8x-slower-registration-with-itk-elastix-python-api-vs-elastix-cli-minimal-reproducible-example/7736)

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**Author:** [@NicoKiaru](https://discourse.itk.org/u/NicoKiaru)\
**Replies:** 39\
**Last updated:** [June 5, 2026, 7:14pm UTC](https://discourse.itk.org/t/8x-slower-registration-with-itk-elastix-python-api-vs-elastix-cli-minimal-reproducible-example/7736 "2026-06-05T19:14:41Z")

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Disclaimer: this is a \[crosspost from image.sc\]( ~8x slower registration with itk-elastix Python API vs elastix CLI — minimal reproducible example - Usage & Issues - Image.sc Forum ) Hi all, I’m integrating itk-elastix…

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## [ITKElastix for Mesh Transformation: TransformixFilter.GetOutputMesh() returns None](https://discourse.itk.org/t/itkelastix-for-mesh-transformation-transformixfilter-getoutputmesh-returns-none/7615)

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**Author:** [@DVigneault](https://discourse.itk.org/u/DVigneault)\
**Replies:** 4\
**Last updated:** [April 6, 2026, 1:27pm UTC](https://discourse.itk.org/t/itkelastix-for-mesh-transformation-transformixfilter-getoutputmesh-returns-none/7615 "2026-04-06T13:27:51Z")

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All– Say I have used elastix to register a moving image moving.nii.gz to a fixed image fixed.nii.gz, resulting in a transformation file params.txt. I would now like to apply the transformation in params.txt to a mesh i…

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## [Elastix WeightedCombinationTransform](https://discourse.itk.org/t/elastix-weightedcombinationtransform/7568)

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**Author:** [@Sylvester\_Wu](https://discourse.itk.org/u/Sylvester_Wu)\
**Replies:** 2\
**Last updated:** [June 23, 2025, 4:14pm UTC](https://discourse.itk.org/t/elastix-weightedcombinationtransform/7568 "2025-06-23T16:14:45Z")

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Hi Everyone, I’m very new to ITK and elastix. I have a set of 2-channel images of Tetraspeck fiducial beads in green and far red fluorescence and would like to register the two channels relative to each other for subseq…

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## [Use of TransformRigidityPenalty Fails](https://discourse.itk.org/t/use-of-transformrigiditypenalty-fails/6273)

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**Author:** [@calici](https://discourse.itk.org/u/calici)\
**Replies:** 2\
**Last updated:** [November 17, 2023, 1:51pm UTC](https://discourse.itk.org/t/use-of-transformrigiditypenalty-fails/6273 "2023-11-17T13:51:34Z")

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Hi! I am using deformable intensity-based algorithm to register pretreatment and posttreatment CT pairs. I want a specific region defined by a segmentation not to be deformed much during nonlinear registration. For tha…

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## [Composite Transform with second Transform on resampled Image](https://discourse.itk.org/t/composite-transform-with-second-transform-on-resampled-image/6163)

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**Author:** [@kenrickmoke](https://discourse.itk.org/u/kenrickmoke)\
**Replies:** 3\
**Last updated:** [August 29, 2023, 8:10am UTC](https://discourse.itk.org/t/composite-transform-with-second-transform-on-resampled-image/6163 "2023-08-29T08:10:13Z")

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Hello Community, my question is regarding a cleaner way to combine multiple transforms where the latter transforms are optimized over the resampled image. So what I want to do smth like this: resampled = T1(fixed,movi…