Design And Implementation Of An Electromechanical Systems For Multi-modal Small Animal Imaging

Compared with single- modal molecular imaging device, multi- modal molecular imaging device has obvious advantages. Therefore, More and more attention have been atracted by the implementation of multi- modal molecular imaging devices. Based on the previous research on molecular imaging technology of our lab, we plan to develop an Optical/PET/C T triple-mode imaging device. The electromechanical system plays an important role in the multi- modality imaging system. It determines the scanning mode of the system, and its precision affacts the quality of the imaging system. Therefore, based on this requirement, we developed a electromechanical system for the Optical/PET/CT triple-mode imaging system.The main work of this thesis includes the following two aspects:1. Design and implementation the mechanical system. First we investgated the fusion strategy of the triple- mode imaging system, and studied the implementations of the various domestic and foreign institutions. Then according to the design objectives and parameters of our multi- modality imaging system, we designed the overall structure of the system. After that, we designed each modules respectively, including the rotating support module, transmission module, power system module and the mouse holder. The force simulation analysis of the core part of the mechanical system has been performed. The simulation results verified the reliability of the mechanical design. Final, the performaces of the mechanical system were tested through a series of experiments, including the end jump and radial beat texting. The experimental results showed that the mechanical system reached the predesign requirements.2. Design and implementation the motion control system. After the design of mechanical systems, we also need to design a motion control system, including the rotation control system and the translational control system. The merits of the motion control system determines the performance of the electromechanical system. Multi- modality imaging system requiremented a high performance for mechanical movement, so we designed a dual- loop control scheme for the rotation control system. It includeed a large closed- loop and a small closed- loop. we had also designed a translational control scheme. The rotation control was the core of motion control system. We designed a set of experiments to verify the performance of control systems, including motor rotation accuracy calibration testing and rotating acuracy testing. The results of the experiment showed that the control system met the requirements of multi-modal system.