# Error with DICOM series and PET normalization

**URL:** <https://discourse.slicer.org/t/error-with-dicom-series-and-pet-normalization/13110>\
**Category:** Support\
**Created:** [August 20, 2020, 12:55pm UTC](https://discourse.slicer.org/t/error-with-dicom-series-and-pet-normalization/13110 "2020-08-20T12:55:20Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![MarPa](https://avatars.discourse-cdn.com/v4/letter/m/6bbea6/32.png) [@MarPa](https://discourse.slicer.org/u/MarPa)\
**Post date:** [August 20, 2020, 12:55pm UTC](https://discourse.slicer.org/t/error-with-dicom-series-and-pet-normalization/13110/1 "2020-08-20T12:55:20Z")

</div>

Hello,

I’m trying to calculate the radiomics features with pyradiomics in 3Dslicer. However, when i’m trying to normalize the DICOM series with PETDICOMExtension, i get a warning, which shows the following error: series does not have radiopharmaceutical code sequence.  
Is there a problem with my DICOM series?  
Can i calculate the radiomics features without normalizing the DICOM series?

Thanks for your help!!