CERN / CERN/TIGRE

The issue with slice image display

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Description

![Image](https://github.com/user-attachments/assets/3df8f60d-5110-4b67-a7d9-8e76a3c8bb2f)

![Image](https://github.com/user-attachments/assets/601e939a-c4a5-4b00-9f44-4f8b00051b9c)
Figure 1 shows the slice image from the FBP algorithm in d15_3Dparaller.m, while Figure 2 displays the slice image from the OS_SART algorithm in d15. The projection data is my own. The FBP-reconstructed slice clearly shows the object, but why is the iterative algorithm's reconstructed image entirely black with nothing visible?

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