# SUV conversion error - Can't find tag 18 1072 - but tag 18 1078 available

**URL:** <https://discourse.slicer.org/t/suv-conversion-error-cant-find-tag-18-1072-but-tag-18-1078-available/24962>\
**Category:** Support\
**Tags:** pet, suv\
**Created:** [August 28, 2022, 10:04am UTC](https://discourse.slicer.org/t/suv-conversion-error-cant-find-tag-18-1072-but-tag-18-1078-available/24962 "2022-08-28T10:04:54Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![samcyc](https://avatars.discourse-cdn.com/v4/letter/s/87869e/32.png) [@samcyc](https://discourse.slicer.org/u/samcyc)\
**Post date:** [August 28, 2022, 10:04am UTC](https://discourse.slicer.org/t/suv-conversion-error-cant-find-tag-18-1072-but-tag-18-1078-available/24962/1 "2022-08-28T10:04:54Z")

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Hello everybody,

I can’t convert my DICOM files in Bq/mL into SUV.  
I think the problem comes from the metadata of my data which do not contain the tag (0018,1072) RadiopharmaceuticalStartTime, as the error message of the “SUV Factor Calculator” module tells me:  
itk::ExceptionObject (0000005A9AB9D0D0)  
Location: “unknown”  
File: D:\D\S\S-0-E-b\PETDICOMExtension\SUVFactorCalculatorCLI\itkDCMTKFileReader.cxx  
Line: 89  
Description: ITK ERROR: Can’t find tag 18 1072

However, in the documentation of this module, they mention that the tag (0018,1078) RadiopharmaceuticalStartDateTime​ can be interchangeable with the tag (0018,1072) RadiopharmaceuticalStartTime, and my metadata contains this tag.

How can I overcome this error message?

Thank you very much !

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**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [August 28, 2022, 7:49pm UTC](https://discourse.slicer.org/t/suv-conversion-error-cant-find-tag-18-1072-but-tag-18-1078-available/24962/2 "2022-08-28T19:49:33Z")

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You could try filing an issue and contacting the developers here: [GitHub - QIICR/Slicer-PETDICOMExtension: 3D Slicer extension containing tools for importing DICOM PET series](https://github.com/QIICR/Slicer-PETDICOMExtension)