Hello, Does anyone know how to change the material of CT detector. I only found GGEMSCTSystem.cc, but it seems not the right one.

Hello,
You do not need to modify GGEMSCTSystem.cc. The detector material can be set directly from the Python interface using the set_material() method:

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ct_detector.set_material('GOS')
Replace 'GOS' with the name of the material you want to use from the GGEMS material database.
You can print information about the GGEMS material database using:

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ggems.material_database_verbose(True)