# How to run benchmark tests

**URL:** <https://castor-project.discourse.group/t/how-to-run-benchmark-tests/516>\
**Category:** General Discussions\
**Created:** [May 9, 2023, 4:29pm UTC](https://castor-project.discourse.group/t/how-to-run-benchmark-tests/516 "2023-05-09T16:29:19Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![a.student](https://avatars.discourse-cdn.com/v4/letter/a/3ab097/32.png) [@a.student](https://castor-project.discourse.group/u/a.student)\
**Post date:** [May 9, 2023, 4:29pm UTC](https://castor-project.discourse.group/t/how-to-run-benchmark-tests/516/1 "2023-05-09T16:29:19Z")

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Hello everyone,

I have just installed CASToR and am trying to use it for the first time to understand how it works. However, I don’t really understand how I can use the benchmarks. I have downloaded the zip folders for the SPECT, but I don’t know how to run them.  
I am sorry if this question seems too simple for most of you, but I am really struggling with the documentation.

If someone could explain it to me in an easy (and beginner-friendly) way I would really appreciate it.

Thank you for your time!

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**Author:** ![alexandremerasli](https://avatars.discourse-cdn.com/v4/letter/a/3da27b/32.png) [@alexandremerasli](https://castor-project.discourse.group/u/alexandremerasli)\
**Post date:** [May 10, 2023, 8:05am UTC](https://castor-project.discourse.group/t/how-to-run-benchmark-tests/516/2 "2023-05-10T08:05:20Z")

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Hi Adriana,

To do your first reconstruction, you need to use the castor-recon executable. To be sure it works, you can type “castor-recon” in a terminal. It should print you the help of the executable, showing all the options you can use. If it works, then you need to add some options like SPECT sinogram data (-df), voxel size (-vox), dimension of output image (-dim), output directory to save the reconstructed images (-dout) etc.  
To know which value to put for voxel size and dimension, you can have a look at the hdr file, which contains metadata of a reconstructed image by CASToR.

All of this should be explained in the “Getting started” section of the documentation.

Do not hesitate if you have other questions.  
Best,  
Alexandre

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**Author:** ![a.student](https://avatars.discourse-cdn.com/v4/letter/a/3ab097/32.png) [@a.student](https://castor-project.discourse.group/u/a.student)\
**Post date:** [May 10, 2023, 10:59am UTC](https://castor-project.discourse.group/t/how-to-run-benchmark-tests/516/3 "2023-05-10T10:59:26Z")

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Thank you so much! Your reply really helped to understand a little better how CASToR works.