CAJ | 학술논문

材料、驱动方式和涡电流对核磁共振兼容性有重要影响。建立了C型永磁体涡流场仿真环境，采用有限元方法分析不同材料、不同工作状态（静态、动态）下涡流场的分布以及变化规律；获得不同材料在成像区域内的涡流场强度。结果表明，同一工作频率下，静态涡流场随相位的不断增大逐渐减小；动态涡流场在未进入成像区域时随距离的减小而增大并在成像区域边缘形成极值；执行机构在进入成像区域时内部涡流场逐渐衰减，处于成像区域中心时达到稳定状态。
재료、구동방식화와전류대핵자공진겸용성유중요영향。건립료C형영자체와류장방진배경，채용유한원방법분석불동재료、불동공작상태（정태、동태）하와류장적분포이급변화규률；획득불동재료재성상구역내적와류장강도。결과표명，동일공작빈솔하，정태와류장수상위적불단증대축점감소；동태와류장재미진입성상구역시수거리적감소이증대병재성상구역변연형성겁치；집행궤구재진입성상구역시내부와류장축점쇠감，처우성상구역중심시체도은정상태。
Materials, actuators and eddy currents have significant effects on magnetic resonance?compatibility under magnetic resonance environment. This paper presented a C type?based simulation environment of permanent magnets to investigate the influence of different materials and different working mode ( static and dynamic) on eddy current fields using the finite element method. The reasons why eddy current fields changed with materials and conditions were analyzed and eddy current magnetic intensities in imaging areas were determined. The results showed prelimi?narily that:(1) for the same frequency, when phase increases from 0°to 90°, eddy current magnetic intensity un?der static state decreases;(2) the dynamic eddy curent magnetic intensity increases with decreasing distance when actuators does not reach imaging area and reaches a peak value near the margin of imaging area; (3) its internal eddy current magnetic intensity gradually decays when actuator centers into the imaging area and keeps a steady state at the center of imaging area.