In the flat panel detector CT system independently developed by the laboratory, our team started from the core hardware and originally designed and manufactured a toothless transmission turntable based on AC servo direct drive, which effectively eliminated the gap and return error common in traditional gear reducers. The turntable is equipped with a singleturn 23-bit high-precision encoder, combined with servo closed-loop control, so that the mechanical positioning accuracy of each angle step reaches the micro-radian level, which lays a solid foundation for the geometric consistency and reconstruction accuracy of CT projection data.

In the detector section, the system uses a high-sensitivity large-size flat panel detector with an imaging format of up to 3072×3072 pixels, uniform pixel size and linear dynamic response, which can capture weak signals with very low noise floor. Combined with the dynamic exposure control module and real-time noise suppression algorithm, the device can complete high-quality tomography scans on various samples with a diameter of 350 mm and a vertical height of 380 mm. At the same dose, the imaging contrast and resolution are better than the mainstream products in the industry.

Through the self-developed reconstruction software platform, the CT system can perform processing processes such as filtering, reverse projection, iterative reconstruction and multi-scale noise reduction on the collected projection data, and support 3D visualization and arbitrary section browsing of volume data. Thanks to the collaborative optimization of the precision turntable and the high-resolution detector, the system can accurately locate small defects such as metal welds, internal delamination of composite materials, and packaging structures of electronic devices in the field of industrial non-destructive testing. In biomedical engineering, it can be used for non-invasive tomography of small animal bones and soft tissues to help drug discovery and tissue engineering research.