关键词: 磁共振, 多源射频脉冲发生器, 可重构性, 小型化

Abstract:

In the field of magnetic resonance imaging (MRI), multi-source emission is an advanced technology that can improve the uniformity of radio frequency (RF) magnetic field and the quality of MRI images. In this paper, we propose a portable MRI multi-source RF pulse generator design based on the Zynq 7000 SoC all programmable system-on-chip. The design consists of a host computer software with fully open pulse sequence parameters and a fully digitalized, highly integrated, dual credit card sized hardware board, which outputs multiple RF pulse signals with independently adjustable waveform, frequency, phase and amplitude in parallel. The hardware description language Verilog is used to build AXI DDS and multiplier circuits inside the FPGA to realize the functions of generating multiple RF pulse signals and signal modulation. The experimental results show that the design can correctly transmit four MRI RF pulse signals, providing a fully digital, reconfigurable, compact and feasible solution for the design of portable magnetic resonance multi-source RF pulse generator.

Key words: Magnetic resonance, multi-source RF pulse generator, reconfigurability, miniaturization