| Magnetic Resonance Imaging (MRI) has been widely used in medical diagnosis fields. A main feature, which distinguishes MRI from other imaging technologies, is the non-ionization radiation for patients. Nowadays, the main research direction of MRI is multiple receiver coils-based parallel MRI (pMRI), which has advantages in Shortening the time of imaging or improving image quality with the same time consuming. A MRI data processing circuit for pMRI has been designed in this paper. This circuit can accelerate image reconstruction with powerful multi-core DSP and improve the signal to noise ratio (SNR) of image with direct sampling and processing.To deal with the poor calculation ability of spectrometer existing in lab, a design of multi-core DSP+FPGA aiming at enhancing the calculation ability is presented. Multi-core DSP is used for multi-channel data real-time reconstruction, which can increase the SNR and also decrease the reconstruction time. Several modules are designed according to the scheme. After finishing the PCB design, several tests are applied for DDR3 SDRAM, SRIO and GbE. In view of the part software design, the parallel program design method of multi-core DSP has been further studied. The 2-D FFT and SoS reconstruction algorithm was chosen to be the multi-channel reconstruction algorithm. Meanwhile some optimizing strategys based on the DSP structure have been applied based on the DSP struucture, which can use the DSP more efficient. Parallel program design has been applied on the algorithm for better performance. Finally the reconstruction algorithm for pMRI which is based on parallel has been applied on 4 DSP cores for parallel processing.The results can indicate that multi-core DSP, as the kernel of data processing, can shorten the reconstruction time in the pMRI system. The MRI data processing circuit based-on multi-core DSP can meet the upgrade demands for existing spectrometer and satisfy the the demands of the real-time reconstruction of pMRI. |
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