What is CatSim?

CatSim is a CT and X-ray simulator created by GE HealthCare in 2002 and continuously improved since then. CatSim includes detailed physics models for realistic simulation of X-ray imaging systems. CatSim was originally designed specifically for computed tomography (CT), but later has also been adapted for mammography and other X-ray applications. CatSim is intended to be easy to use but also to be flexible so users can define their own simulation parameters and integrate their own custom simulation models. CatSim also includes digital phantoms, reconstruction algorithms, and radiation dose simulation capability.

What is XCIST?

XCIST stands for X-ray-based Cancer Imaging Simulation Toolkit. XCIST is an open-source simulation toolkit funded by NIH NCI ITCR grant U01CA231860 and includes:

• CatSim (open-source Python version)
• CT reconstruction algorithms
• A set of XCAT phantoms: digital representations of patients with and without realistic tumors
• Flat-panel detector models

More details are found in our XCIST overview publication: https://doi.org/10.1088/1361-6560/ac9174

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