# ITK Data for examples

**URL:** <https://discourse.itk.org/t/itk-data-for-examples/2466>\
**Category:** Uncategorized\
**Tags:** registration\
**Created:** [December 2, 2019, 7:20pm UTC](https://discourse.itk.org/t/itk-data-for-examples/2466 "2019-12-02T19:20:19Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![machadoL](https://discourse.itk.org/user_avatar/discourse.itk.org/machadol/32/662_2.png) [@machadoL](https://discourse.itk.org/u/machadoL)\
**Post date:** [December 2, 2019, 7:20pm UTC](https://discourse.itk.org/t/itk-data-for-examples/2466/1 "2019-12-02T19:20:19Z")

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Guys,  
I am trying to reproduce the ITK example `ImageRegistration8.cxx` in the examples folder.

This example uses the following files: `brainweb1e1a10f20.mha` and `brainweb1e1a10f20Rot10Tx15.mha`.

Although, when I look into examples data files/BrainWeb I only find the following files: `brainweb1e1a10f20.mha.md5` and `brainweb1e1a10f20Rot10Tx15.mha.md5`.  
Apparently the same files, but with different extensions (`.mha.md5` instead of just `.mha`).

When I run the application it gives an IO error. ITK does not recognize such formats:

`>> Could not create IO object for reading file brainweb1e1a10f20.mha.md5`

Do you guys know how to solve that?

Thanks in advance.

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**Author:** ![matt.mccormick](https://discourse.itk.org/user_avatar/discourse.itk.org/matt.mccormick/32/7_2.png) [@matt.mccormick](https://discourse.itk.org/u/matt.mccormick)\
**Post date:** [December 2, 2019, 7:30pm UTC](https://discourse.itk.org/t/itk-data-for-examples/2466/2 "2019-12-02T19:30:05Z")

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Hi @machadoL,

The _.md5_ and _.sha512_ files are [content links to avoid bloat of the Git repository](https://blog.kitware.com/cmake-externaldata-using-large-files-with-distributed-version-control/).

The files they point to can be found here:

[https://data.kitware.com/#collection/57b5c9e58d777f126827f5a1/folder/57b769c08d777f10f269af3a](https://data.kitware.com/#collection/57b5c9e58d777f126827f5a1/folder/57b769c08d777f10f269af3a)

Matt

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**Author:** ![machadoL](https://discourse.itk.org/user_avatar/discourse.itk.org/machadol/32/662_2.png) [@machadoL](https://discourse.itk.org/u/machadoL)\
**Post date:** [December 2, 2019, 7:38pm UTC](https://discourse.itk.org/t/itk-data-for-examples/2466/3 "2019-12-02T19:38:47Z")

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Great. Thanks, Matt.