# \#n4biasfield

**URL:** https://discourse.itk.org/tag/n4biasfield/96.md

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## [N4 bias field correction - Can't find "spline spacing" in simpleITK](https://discourse.itk.org/t/n4-bias-field-correction-cant-find-spline-spacing-in-simpleitk/6267)

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**Author:** [@tonkeln](https://discourse.itk.org/u/tonkeln)\
**Replies:** 4\
**Last updated:** [October 30, 2023, 10:25am UTC](https://discourse.itk.org/t/n4-bias-field-correction-cant-find-spline-spacing-in-simpleitk/6267 "2023-10-30T10:25:40Z")

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Hello everyone, In 3D Slicer (and ANTs) there is the parameter “spline spacing” or “spline distance” to define the distance between control points for the N4 bias field correction. I would like to reproduce a paper whe…

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## [Inhomogeneity correction using N4 and Python](https://discourse.itk.org/t/inhomogeneity-correction-using-n4-and-python/6123)

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**Author:** [@Cambridgeshire](https://discourse.itk.org/u/Cambridgeshire)\
**Replies:** 1\
**Last updated:** [August 1, 2023, 1:02pm UTC](https://discourse.itk.org/t/inhomogeneity-correction-using-n4-and-python/6123 "2023-08-01T13:02:18Z")

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Hey dear supporters, I would like to perform inhomogeneity correction of head and pelvis NIfTI MRI images using Python. My code looks like this: Image = sitk.ReadImage(path) image = sitk.Cast(Image, sitk.sitkFloat32) …

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## [Passing mask argument in N4BiasFieldCorrection()](https://discourse.itk.org/t/passing-mask-argument-in-n4biasfieldcorrection/5793)

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**Author:** [@Thomas\_Jeong](https://discourse.itk.org/u/Thomas_Jeong)\
**Replies:** 3\
**Last updated:** [March 19, 2023, 11:19pm UTC](https://discourse.itk.org/t/passing-mask-argument-in-n4biasfieldcorrection/5793 "2023-03-19T23:19:09Z")

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Hello all, Trying to use the N4BiasFieldCorrection() method to fix the intensity inhomogeneity in Dixon MRI scans. I have used the function with success just passing the image as the only argument, such as below: sitk.…

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## [N4 Bias Field Correction](https://discourse.itk.org/t/n4-bias-field-correction/3972)

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**Author:** [@banikr](https://discourse.itk.org/u/banikr)\
**Replies:** 3\
**Last updated:** [March 24, 2021, 7:17pm UTC](https://discourse.itk.org/t/n4-bias-field-correction/3972 "2021-03-24T19:17:09Z")

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Hello All, I want to apply bias field correction in 3D T1w MR volumes(including non-brain sections too). Images are in NIfTI format. Though it is recommended to use masks, I don’t have masks or atlas for the data. I sa…

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## [Save parameters for N4 bias field correction](https://discourse.itk.org/t/save-parameters-for-n4-bias-field-correction/3530)

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**Author:** [@federico\_nemmi](https://discourse.itk.org/u/federico_nemmi)\
**Replies:** 3\
**Last updated:** [October 23, 2020, 12:31pm UTC](https://discourse.itk.org/t/save-parameters-for-n4-bias-field-correction/3530 "2020-10-23T12:31:31Z")

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Hi, I have acquired a 6 points MRI Dixon sequence from which I have derived Water, Fat and Fat Fraction images. Since the derived images all come from the same original sequence, they all share the same field bias (at le…

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## [Issues reproducing N4BiasFieldCorrection results in Windows and Linux](https://discourse.itk.org/t/issues-reproducing-n4biasfieldcorrection-results-in-windows-and-linux/1623)

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**Author:** [@rcorredorj](https://discourse.itk.org/u/rcorredorj)\
**Replies:** 12\
**Last updated:** [April 1, 2019, 3:47pm UTC](https://discourse.itk.org/t/issues-reproducing-n4biasfieldcorrection-results-in-windows-and-linux/1623 "2019-04-01T15:47:54Z")

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Hi ITKers, I’m having troubles to reproduce exactly the same results with the N4BiasFieldCorrection in Windows vs. Linux. Even more strange it does work for certain cases, but not for others. I’ve tried already many thi…