# How to sum (or average) scalar volumes of a dynamic PET study?

**URL:** <https://discourse.slicer.org/t/how-to-sum-or-average-scalar-volumes-of-a-dynamic-pet-study/36107>\
**Category:** Support\
**Created:** [May 13, 2024, 7:29am UTC](https://discourse.slicer.org/t/how-to-sum-or-average-scalar-volumes-of-a-dynamic-pet-study/36107 "2024-05-13T07:29:50Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![angelods](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/angelods/32/8299_2.png) [@angelods](https://discourse.slicer.org/u/angelods)\
**Post date:** [May 13, 2024, 7:29am UTC](https://discourse.slicer.org/t/how-to-sum-or-average-scalar-volumes-of-a-dynamic-pet-study/36107/1 "2024-05-13T07:29:50Z")

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Dear all,  
is there anybody who can give me a suggestion on how to sum the different time-point images of a 4-frame dynamic PET scan I loaded from DICOM importer, and result in a single “static” scan?

Thanks,  
Angelo

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**Author:** ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Post date:** [May 13, 2024, 9:47am UTC](https://discourse.slicer.org/t/how-to-sum-or-average-scalar-volumes-of-a-dynamic-pet-study/36107/2 "2024-05-13T09:47:01Z")

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Have you tried the “Add Scalar Volumes” module? It’s in the category Filtering / Arithmetic.

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**Author:** ![angelods](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/angelods/32/8299_2.png) [@angelods](https://discourse.slicer.org/u/angelods)\
**Post date:** [May 13, 2024, 10:19am UTC](https://discourse.slicer.org/t/how-to-sum-or-average-scalar-volumes-of-a-dynamic-pet-study/36107/3 "2024-05-13T10:19:43Z")

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Thanks for the clue! I separated out the four frames and then I summed them up…

Ciao

Angelo

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**Author:** ![hongzhi\_yang](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/hongzhi_yang/32/80070_2.png) [@hongzhi\_yang](https://discourse.slicer.org/u/hongzhi_yang)\
**Post date:** [April 23, 2025, 10:33pm UTC](https://discourse.slicer.org/t/how-to-sum-or-average-scalar-volumes-of-a-dynamic-pet-study/36107/4 "2025-04-23T22:33:36Z")

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Hi, would you like to share the whole procedure? I only need to sum the 60-120 min dynamic PET imaging, can 3D slice make it? thank you so much for your support.