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MRI中电磁场对人体心脏影响的模型仿真研究 被引量：1

Simulation study of heart stimulation caused by MRI electromagnetic field
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摘要 运用时域有限差分法(FDTD),通过电磁场对人体心脏影响的模型仿真,计算出心脏体段由磁共振成像(MRI)时变梯度场感应的涡流,并与已有的心脏刺激阈值进行比较。结果表明,心脏感应涡流的峰值离推荐阈值尚有一定距离。人体在常用的梯度场和几千赫兹的切换频率下感应出的电流不足以引发心室震颤,但是,梯度场切换频率的提高可能会引发心室震颤。 By employing FDTD method and simulating the effects of electromagnetic on the heart of human body, the eddy-currents of the heart of human body induced by MRI time-varying gradient fields are computed and compared with the recommended threshold. The results show that the peak of the induced eddy-current is lower than the threshold, and it can't result in fibrillation. We draw a conclusion that the induced eddy-currents under common gradient fields and switching frequency of several thousand Hz aren't strong enough to induce ventricular fibrillation, but if enhance frequency the ventricular fibrillation will probably occur.
作者 陶贵生 夏灵 何超明
机构地区 浙江大学生物医学工程系
出处 《国外医学（生物医学工程分册）》 2005年第1期1-4,共4页 Foreign Medical Sciences(Biomedical Engineering Fascicle)
基金 国家自然科学基金资助项目(30370400)
关键词 时域有限差分法 吸收边界条件 磁共振成像(MRI) 感应涡流 FDTD method absorbing boundary condition MRI induced eddy-current
分类号 R318.0 [医药卫生—生物医学工程]
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参考文献21

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二级参考文献17

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国外医学（生物医学工程分册）
2005年 第1期

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