Based on the master-slave control structure of the electric grating hardware design
|School||University of Electronic Science and Technology|
|Course||Detection Technology and Automation|
|Keywords||IMRT DMLC FPGA ARM digital PID control|
With the devolopment of the radiation therapy,intensity modulated radiation therapy (IMRT) have been the leading technology of radiation therapy in the 21st century. As one of the indispensable equipment that used in IMRT,DMLC has important value to research.Basic theory and hardware construction of the DMLC were described in this dissertation. Whole design process of control circuit of multi-leaf collimator,including analysis of system function, design of system project, design of hardware circuit were also described in this paper, programming and realization of function. And it detailedly discussed the function of core control part of ARM,information manage and control part of ARM-FPGA,drive part of motor.At last,it provide method of testing system function and sppuly part of testing result.Field Programmable Gates Array (FPGA) and ARM micro processor were used to realize function of Aperture、Step-and-shoot、Sliding-window. Theory of digital PID was ued in leaf control,it realize effective speed control and position control and achieve precision of leaf control.Test results indicate that this DMLC had realized basic fuction of IMRT. It has advantage of high-stabilitiy and high-control precision and can meet the all requirement of IMRT.