# Liver tumor alignement

**URL:** <https://discourse.slicer.org/t/liver-tumor-alignement/37252>\
**Category:** Support\
**Created:** [July 8, 2024, 8:43am UTC](https://discourse.slicer.org/t/liver-tumor-alignement/37252 "2024-07-08T08:43:08Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Noa](https://avatars.discourse-cdn.com/v4/letter/n/919ad9/32.png) [@Noa](https://discourse.slicer.org/u/Noa)\
**Post date:** [July 8, 2024, 8:43am UTC](https://discourse.slicer.org/t/liver-tumor-alignement/37252/1 "2024-07-08T08:43:08Z")

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Hello,  
I study liver tumors in different scan series and I am trying to compare their size, centroïds…  
Hence, I’m trying to do a segmentation on four volumes :

- CT scintigraphy and CT PET where I contour the liver
- scintigraphy and PET where I contour the tumor

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/9/7/9783c373190906f8503e7a63a34984b3dd373750.png)

The problem is that the tumor of TEP is not aligned with the CT, and same for the scintigraphy. Why don’t the tumors directly imbricate in the livers and how can I proceed to fix this?  
Thank you in advance