【摘要】 目的探讨0.3T永磁MRI系统中笼式线圈的计算机模拟和优化。方法运用毕奥-萨伐尔定律,通过计算分析,设计了针对3H,129Xe共振频率的8列高通笼式线圈,利用IDL软件进行相关计算和仿真。结果仿真结果证明了在低场条件下所设计的8列笼式高通线圈产生的射频磁场的均匀性和对称性。当列线数目减少为6列及4列时,笼式线圈产生的磁场均匀性和对称性大大降低。结论仿真精确度较好,误差较低。线圈列数的降低对B1场均匀性造成破坏。更多还原

【Abstract】 Objective To investigate the simulation and optimization of birdcage coil in the 0.3T Permanent Magnet MRI system. Methods The Biot-Savart’s law was applied, a high-pass 8-leg birdcage coil, whose resonant frequency was consistent with ³H and 129 Xe , was designed through some related calculations and simulations. IDL was used to calculate and simulate our scheme. Results The results showed the uniformity and symmetry of magnetic filed produced by the high-pass 8-leg birdcage coil in a low field. When the legs were reduced to 6 and 4, the uniformity and symmetry fell largely. Conclusion The precision of simulation was good. The uniformity and symmetry of B₁ filed would be damaged when the number of the coil legs decreased.更多还原