Gate did not show the ct image in 9_cbct

I run the gate example: 9_cbct, left is my result and right is the example image.

I wanna show the ct image like the example.What should I do.

As this is a GATE example, it would probably be best to contact its developers on its support channels. I’ll move this to the Vis forum in case there’s an obvious solution the experts there can provide.