# mask volume problem in PET images

**URL:** <https://discourse.slicer.org/t/mask-volume-problem-in-pet-images/27004>\
**Category:** Support\
**Tags:** masking, pet\
**Created:** [January 1, 2023, 6:05pm UTC](https://discourse.slicer.org/t/mask-volume-problem-in-pet-images/27004 "2023-01-01T18:05:59Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![bennur](https://avatars.discourse-cdn.com/v4/letter/b/c37758/32.png) [@bennur](https://discourse.slicer.org/u/bennur)\
**Post date:** [January 1, 2023, 6:05pm UTC](https://discourse.slicer.org/t/mask-volume-problem-in-pet-images/27004/1 "2023-01-01T18:05:59Z")

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Hi everyone, i am using Slicer 4.11 and ı am trying masking tumor volumes on PET images but masked volume can be empty for some PET images . I dont understand why?

 ![Screenshot_1](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/5/5/551938aea19a2e878d6262b679fb55edcdf8dc51.png)  
 ![Screenshot](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/f/b/fbef109cb3919bd08902aa28ab674928e32ce1da.png)