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Numerical analysis of interactions between electromagnetic fields and human bodies.

机译：电磁场与人体相互作用的数值分析。

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摘要

Numerous electronic devices operate in the close vicinity of human bodies. Such proximity can lead to a fraction of electromagnetic energies being deposited into human bodies. If the power absorbed is sufficiently large, it may lead to tissue damage. Consequently, interactions of electromagnetic fields with human subjects have been a subject of scientific interest and public concern. On the other hand, some electronic devices taking advantage of such interactions have been developed and applied as effective medical treatments. The research presented in this thesis aims at providing numerical approaches to study the interactions of electromagnetic fields, ranging from low frequency to radio frequency (RF), with human bodies.;Realistic human subject models are necessary in numerical investigations. Nine pregnant woman models, based on magnetic resonance scans, were developed for electromagnetic and thermal analyses. In addition, a realistic male model was also used for numerical analyses.;A novel transcranial magnetic stimulation (TMS) structure is proposed to overcome the limitations of conventional TMS coils. This proposed structure is capable of achieving reconfigurable, multi-channel, and time-sequence magnetic stimulations. The validation of this novel TMS system was verified by numerical simulations and experiments.;The induced current densities and induced electric fields within pregnant woman models exposed to walk-through metal detector (WTMD) emissions were investigated. Through comparisons to current safety limits, it is shown that internal tissues might experience potentially hazard effects due to external magnetic fields.;The electromagnetic and thermal simulations were combined to study the heating effects of strong RF fields on internal tissues within pregnant woman models exposed to magnetic resonance imaging (MRI) RF coil radiations. Simulation results demonstrated that fetus tissue might have higher specific absorption rate and resultant temperature rise than recommended safety limits.;The safety of metallic implants within MRI scan was investigated by performing numerical modeling. The heating effects, caused by the interactions between metallic implants and electromagnetic fields from the MRI coil, were significant.
机译：许多电子设备在人体附近运行。这种接近会导致一部分电磁能沉积到人体中。如果吸收的功率足够大，可能会导致组织损伤。因此，电磁场与人类对象的相互作用已经成为科学关注和公众关注的主题。另一方面，已经开发了一些利用这种相互作用的电子设备并将其用作有效的医疗方法。本文的研究目的是提供数值方法研究从低频到射频（RF）的电磁场与人体的相互作用。;在数值研究中必须有现实的人体模型。根据磁共振扫描，开发了九种孕妇模型，用于电磁和热分析。此外，还使用了逼真的男性模型进行数值分析。提出了一种新颖的经颅磁刺激（TMS）结构，以克服传统TMS线圈的局限性。所提出的结构能够实现可重构的，多通道的和按时间顺序的磁刺激。通过数值模拟和实验验证了该新型TMS系统的有效性。研究了暴露于步行金属探测器（WTMD）辐射的孕妇模型内的感应电流密度和感应电场。通过与当前的安全限值进行比较，表明内部组织可能会由于外部磁场而受到潜在的危害影响。电磁和热模拟相结合，研究了强射频场对暴露于孕妇模型中的内部模型内部组织的加热作用磁共振成像（MRI）射频线圈辐射。仿真结果表明，胎儿组织的比吸收率和所引起的温度升高可能比建议的安全极限要高。；通过进行数值建模，研究了MRI扫描中金属植入物的安全性。由金属植入物和MRI线圈产生的电磁场之间的相互作用引起的热效应非常明显。

著录项

  • 作者

    Wu, Dagang.;

  • 作者单位

    University of Houston.;

  • 授予单位 University of Houston.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 151 p.
  • 总页数 151
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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