Design Of Magnetic Resonance Imaging Receiver Based On NI PXIe-7966R

The magnetic resonance digital receiver is an important part of the magnetic resonance system receiving link,which completes the task of digitizing the simulated magnetic resonance signal.The design and performance of the receiver directly affect the quality of the image.The initial magnetic resonance receiver used analog detection technology,it is difficult to ensure the orthogonality of the two signals used by detection,which will result in the final imaging of the "orthogonal" ghost shadow.According to the design of digital receivers,completely solve the problem of imitation of the two signals due to the orthogonality of the image ghost shadow and other issues.The widely used digital receivers use commercial chips to process digital signals.The functional structure of commercial chip is complex.And commercial chips are less flexible.A magnetic resonance imaging receiver based on NI PXIe-7966R is proposed.The magnetic resonance signal is directly sampled,digitally down-converted,data is uploaded and the magnetic resonance image is restored.The system-level digital signal processing(DSP)development tools offered by NI Lab VIEW FPGA was used for FPGA function modeling,simulation and automatic code generation of HDL.It is very flexible during the digital down conversion designing.The sampling rate of this module is 50Mbps and the receiver bandwidth can be varied between 100Hz and 1MHz.The experimental results show that the designed receiver is feasible.The NI Lab VIEW FPGA development platform is a graphical high-level integrated(HLS)design tool.It is easy for developers to use Lab VIEW to design and implement receiver functions.Through the filter performance test and magnetic resonance imaging experiment,it is proved that the receiver is practical and flexible,and the efficiency is high.