# Comparison with vendors reconstructions

**URL:** <https://pytomography.discourse.group/t/comparison-with-vendors-reconstructions/16>\
**Category:** Usage Questions\
**Created:** [February 9, 2024, 9:52am UTC](https://pytomography.discourse.group/t/comparison-with-vendors-reconstructions/16 "2024-02-09T09:52:31Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ludovic](https://avatars.discourse-cdn.com/v4/letter/l/7ab992/32.png) [@ludovic](https://pytomography.discourse.group/u/ludovic)\
**Post date:** [February 9, 2024, 9:52am UTC](https://pytomography.discourse.group/t/comparison-with-vendors-reconstructions/16/1 "2024-02-09T09:52:31Z")

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Hi Pytomo team!  
Thank you for this nice Python tool.  
I have a question regarding the dicom notebook [you provided](https://pytomography.readthedocs.io/en/latest/notebooks/t_dicomdata.html).  
At some point, to compare the reconstruction with the one offered by the vendor, you used Pydicom to load the vendor’s image, and you divided the pixel array by 90. Why did you do so? Where this 90 factor came from?  
Best regards  
Ludovic

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**Author:** ![json](https://avatars.discourse-cdn.com/v4/letter/j/73ab20/32.png) [@json](https://pytomography.discourse.group/u/json)\
**Post date:** [March 22, 2024, 4:39am UTC](https://pytomography.discourse.group/t/comparison-with-vendors-reconstructions/16/2 "2024-03-22T04:39:31Z")

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> [@ludovic](#):
>
> 90。为什么要这样做？这个90因子从何而来？  
> 最好的问候

I’ve also encountered this problem, I don’t know if you have solved it yet