# CASToR Reconstruction for PET

**URL:** <https://castor-project.discourse.group/t/castor-reconstruction-for-pet/549>\
**Category:** General Discussions\
**Created:** [June 7, 2023, 11:12am UTC](https://castor-project.discourse.group/t/castor-reconstruction-for-pet/549 "2023-06-07T11:12:17Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![inescardoso](https://avatars.discourse-cdn.com/v4/letter/i/ee59a6/32.png) [@inescardoso](https://castor-project.discourse.group/u/inescardoso)\
**Post date:** [June 7, 2023, 11:12am UTC](https://castor-project.discourse.group/t/castor-reconstruction-for-pet/549/1 "2023-06-07T11:12:17Z")

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Hello everyone  
I am using Castor to rebuild a root file coming from a Gate simulation. I am simulating a Philips Vereos PET.  
However when I do the rebuild, even though the file has true matches/singles, everything appears black. Do you know how I can solve the problem?