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In the radiation therapy technology, with the development of 3D conformal radiotherapy and intensity modulate radiotherapy, dynamic multi-leaf collimator is an indispensable equipment. It is a Precision radiotherapy Large-scale medical equipment, it make radiation therapy of the general radiation from the auxiliary entered a new stage of precision radiotherapy, It is all controlled by computer, receive and implement the plan from TPS, drive leaves in place to shelter-ray, instead the traditional lead and manually grating, but also greatly shortened the patients’time, welcomed by doctors. Due to the high cost of foreign equipment, Greatly limited its development.Research on the subject through practice, Developed a fully new autonomous DMLC, It has the characteristics of large size, stability, easy to maintain. This paper introduces the old DMLC architecture, the design use several FPGAs, connected the board with the socket,so there is a problem of the bad connection. And the capacity is so small that can’t expand. And the old way of control is one control panel to control both sides of the leaves, But he needs of the new requirements is both sides is movable, So the communication can not be PCB, but through the soft-wire connection. We have adopted a distributed system,the two sides communication with each other through LVDS, each processor is responsible for their own control algorithms. As the load of each processor is only half of the previous, Therefore, the driven leaves can be increased to more than double the previous.I am responsible for the development of the PC control software and FPGA driver. Focuses on the FPGA communication module, Use the idea of hardware and software co-design module to partition the system, makes the system hierarchical structure clear and easy to maintain. According with the development trend of 4D radiotherapy treatment, We also had a respiratory signal collection and prediction, conducted a study of prediction algorithm, Achieved good results. In addition we need to give products based on the actual increase in the functions of the remote update, in order to upgrade for user, Finally, the actual product testing and the use of very stable, achieved satisfactory control. The accuracy of product performance and stability very good, Achieved very high visibility, Welcomed by the hospital.
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