# ITK FFT Module: 1D FFT filters removed/renamed?
**URL:** https://discourse.itk.org/t/itk-fft-module-1d-fft-filters-removed-renamed/1091
**Category:** Beginner Questions
**Created:** [July 5, 2018, 3:15am UTC](https://discourse.itk.org/t/itk-fft-module-1d-fft-filters-removed-renamed/1091 "2018-07-05T03:15:08Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@gavinb](https://discourse.itk.org/u/gavinb)
#### Post date: [July 5, 2018, 3:15am UTC](https://discourse.itk.org/t/itk-fft-module-1d-fft-filters-removed-renamed/1091/1 "2018-07-05T03:15:08Z")
Hello, we’d like to use the `itk::FFTW1DRealToComplexConjugateImageFilter< TPixel, Dimension >` class which is documented in:
```
https://itk.org/Doxygen410/html/group__FFT1D.html
```
but the group of 1D filters are no longer present in the latest release:
```
https://itk.org/Doxygen/html/group__ITKFFT.html
```
What is the replacement for 1D FFT filtering (of 2D images)?
Thanks!
---
### Author:  [@dzenanz](https://discourse.itk.org/u/dzenanz)
#### Post date: [July 5, 2018, 2:10pm UTC](https://discourse.itk.org/t/itk-fft-module-1d-fft-filters-removed-renamed/1091/2 "2018-07-05T14:10:57Z")
Does anything from [ITKUltrasound](https://github.com/KitwareMedical/ITKUltrasound/tree/master/include) module suit your needs?
---
### Author:  [@matt.mccormick](https://discourse.itk.org/u/matt.mccormick)
#### Post date: [July 5, 2018, 3:13pm UTC](https://discourse.itk.org/t/itk-fft-module-1d-fft-filters-removed-renamed/1091/3 "2018-07-05T15:13:02Z")
@dzenanz is correct – these filters are maintained in the _ITKUltrasound_ external module.
This module currently uses ITK 4.13, but we will be transitioning to ITK 5 over the next few months.