# How to set PET SUVmax 40% threshold？

**URL:** https://discourse.slicer.org/t/how-to-set-pet-suvmax-40-threshold/27124
**Category:** Support
**Tags:** segmentation
**Created:** [January 9, 2023, 9:18am UTC](https://discourse.slicer.org/t/how-to-set-pet-suvmax-40-threshold/27124 "2023-01-09T09:18:06Z")
**Posts on this page:** 2
**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: [January 9, 2023, 9:18am UTC](https://discourse.slicer.org/t/how-to-set-pet-suvmax-40-threshold/27124/1 "2023-01-09T09:18:06Z")

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When I watch PET/CT，I need to draw the ROI to quantificat the SUV value of some volum, but how can I set the threshold of PET to appointed value like SUVmax 40% …

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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: [January 9, 2023, 3:55pm UTC](https://discourse.slicer.org/t/how-to-set-pet-suvmax-40-threshold/27124/2 "2023-01-09T15:55:41Z")

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There are several PET-specific extensions, including a new SlicerMUST that may provide the functionality you are looking for.