The Reconstruction Toolkit (RTK) is an open-source and cross-platform software for fast circular cone-beam CT reconstruction based on the Insight Toolkit (ITK). RTK is developped by the RTK consortium. RTK provides or will provide

• Basic operators for reconstruction, e.g., filtering, forward, projection and backprojection
• Multithreaded CPU and GPU versions
• Tools for respiratory motion correction
• I/O for several scanners
• Preprocessing of raw data for scatter correction