# Totalsegmentator to generate segmentation files, and the use these files to compute CT/PET suv value. but get the wrong answers

**URL:** <https://discourse.slicer.org/t/totalsegmentator-to-generate-segmentation-files-and-the-use-these-files-to-compute-ct-pet-suv-value-but-get-the-wrong-answers/27948>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [February 21, 2023, 2:05pm UTC](https://discourse.slicer.org/t/totalsegmentator-to-generate-segmentation-files-and-the-use-these-files-to-compute-ct-pet-suv-value-but-get-the-wrong-answers/27948 "2023-02-21T14:05:16Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![zhang\_ming](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/zhang_ming/32/15790_2.png) [@zhang\_ming](https://discourse.slicer.org/u/zhang_ming)\
**Post date:** [February 21, 2023, 2:05pm UTC](https://discourse.slicer.org/t/totalsegmentator-to-generate-segmentation-files-and-the-use-these-files-to-compute-ct-pet-suv-value-but-get-the-wrong-answers/27948/1 "2023-02-21T14:05:16Z")

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without or with the Totalsegmentator plugin , I draw roi manually or by AI, and then use the suv tools ,compute get blank or error value. pic here

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/d/1/d154a328c742c80708d23c3b4c5b001c052ef439.png)

may anyone help me to solve the problems.  
The in hospital Doctor want to use this to analysis cancer patients, that will help patients a lot.  
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:** [February 21, 2023, 2:36pm UTC](https://discourse.slicer.org/t/totalsegmentator-to-generate-segmentation-files-and-the-use-these-files-to-compute-ct-pet-suv-value-but-get-the-wrong-answers/27948/2 "2023-02-21T14:36:25Z")

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I’d suggest practicing with public sample data, e.g. PET/CT from TCIA or IDC, and then see what’s different in the data you have. If you find issues with the code that are specific to your data, then see if you can upload deidentified examples to illustrate the issues for reproduction and debugging.

Be sure to note that the Slicer tools are not officially supported and are intended for research only.

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**Author:** ![zhang\_ming](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/zhang_ming/32/15790_2.png) [@zhang\_ming](https://discourse.slicer.org/u/zhang_ming)\
**Post date:** [February 21, 2023, 2:42pm UTC](https://discourse.slicer.org/t/totalsegmentator-to-generate-segmentation-files-and-the-use-these-files-to-compute-ct-pet-suv-value-but-get-the-wrong-answers/27948/3 "2023-02-21T14:42:18Z")

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ok, got it.  
thank you very much.  
our research is about pet suv value on colon. to become a reference to cancer situation. so the pet tools are very import for us

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**Author:** ![zhang\_ming](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/zhang_ming/32/15790_2.png) [@zhang\_ming](https://discourse.slicer.org/u/zhang_ming)\
**Post date:** [February 21, 2023, 2:59pm UTC](https://discourse.slicer.org/t/totalsegmentator-to-generate-segmentation-files-and-the-use-these-files-to-compute-ct-pet-suv-value-but-get-the-wrong-answers/27948/4 "2023-02-21T14:59:25Z")

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Sorry, correction, our patient are not patients with intestinal cancer. We will try it as soon as possible according to your suggestion!