# Reconstruction issue

**URL:** <https://castor-project.discourse.group/t/reconstruction-issue/39>\
**Category:** General Discussions\
**Created:** [March 6, 2018, 7:02pm UTC](https://castor-project.discourse.group/t/reconstruction-issue/39 "2018-03-06T19:02:05Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![nikta\_zarif](https://avatars.discourse-cdn.com/v4/letter/n/bb73d2/32.png) [@nikta\_zarif](https://castor-project.discourse.group/u/nikta_zarif)\
**Post date:** [March 6, 2018, 7:02pm UTC](https://castor-project.discourse.group/t/reconstruction-issue/39/1 "2018-03-06T19:02:05Z")

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Hello Castor users,

I have tried to reconstruct images with Castor but I am getting wrong images. I can not find where the problem comes from.

Here is what I do:

1. I define my PET scanner geometry according to CylindricalPET geometry of Gate (cylindricalPET\_Geom, attached to this email)

2. I perform my Gate simulation and receive output in .ROOT format.

3. I use “castor-GATERootToCastor” to convert my data to castor form and also generating the corresponding scanner using -geo command (you can find the .log file in the link below)

4)I use “castor-recon” to reconstruct the images (you can see them in my google drive)

[https://drive.google.com/open?id=12wFFGLTjFz8YnvLgXbQjtjW9PlOjSalg](https://drive.google.com/open?id=12wFFGLTjFz8YnvLgXbQjtjW9PlOjSalg)

Any type of help is highly appreciated.

Regards

Nik

[cylindricalPET\_Geom.mac](https://castor-project.discourse.group/uploads/short-url/klZrFJU64BjyU3nVBmVqorcQfHh.mac) (8.74 KB)