PET Data Acquisition System Based On Miz702 Development Board

Positron Emission Computer Tomography?PET?plays an increasingly important role in the treatment of tumors,cardiovascular and other diseases.It combines the advantages of nuclear medicine and can non-invasively,dynamically and quantitatively detect the blood flow and metabolism in living bodies.The situation is a large medical device with functional imaging.With the development of nuclear electronics,people demand of PET to have higher performance.In order to make the PET data acquisition system faster,more accurate,and easy to use in conjunction with other devices,this article uses the Miz702 development board based on Xilinx Zynq chip to replace the traditional PET data acquisition box,and use Vivado 2016software to design the chip circuit,then perform data test through SDK.First This article test the transmission speed and accuracy of the known data,then design a point radioactivity experiment to simulate the real situation of the patient,build an experimental hardware platform,finally transfer the collected data to the host computer software,and use the software to match the detector performance and data,Sensitivity,resolution for testing.Firstly,This article use Vivado 2016 software to debug and program the development board.When debugging,We should design the block design diagram of the system Firstly,then configure the pins and parameters of the DMA?Direct Memory Access?IP core and FIFO?First in First out?IP core,and finally use it in conjunction with the SDK to test the DMA IP core data packet transmission Speed and accuracy.According to the results,the accuracy of the data in the transmission process is correct,and the speed is 150MB/s,which meets the requirements of clinical data packet speed transmission and reception.When programming the program,this paper designs a method of Flash bin file based on TCP/IP transmission protocol to support remote online debugging and updating.The next step is to design the detector module at the front end of the acquisition system,using BGO crystal,each crystal adopts 8*8 splitting mode,and design 8*8array resistance readout circuit according to the splitting mode.The ADC analog-to-digital conversion uses the AFE5805 chip,which gives the working principle diagram of the chip and solves the clock problem when the chip works.The data transmission between the lower computer and the upper computer is based on the design of Gigabit network transmission,and the data transmission protocol used is TCP/IP protocol.The software design of the host computer is based on the MFC function of VS2010.The main purpose of the software is to perform purposeful analysis on the collected data and realize the real-time display of the data.Finally,This articlea designed a block diagram of the data acquisition system,and the system is tested by hardware.In order to prevent the high-voltage power supply from being damaged by accident during the test,this paper designs a high-voltage power supply protection system.The radioactive source used in the test was an artificial ²²Na positron radioactive source.After the data collection and transmission were completed,the performance of the detector,the spatial resolution of the system?including 2D and 3D?,and the overall sensitivity of the system were tested using the host computer software.The experimental results show that the data acquisition system meets the design requirements in terms of speed,accuracy,and anti-interference performance of data transmission and reception,and meets the standards of clinical PET data acquisition system in terms of system spatial resolution and sensitivity.