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在MRI中使用选择性屏蔽的隐形射频能量采集
Oskar Bjorkqvist1, Klaas P Pruessmann1
1Institute for Biomedical Engineering, ETH Zurich and University of Zurich, Zurich, Switzerland.
Magnetic resonance in medicine
|February 27, 2024
概括
研究人员开发了一种方法,从MRI扫描中收集射频 (RF) 能量,为体内设备提供动力. 这种选择性屏蔽技术确保在磁共振成像 (MRI) 过程中不会对图像质量或患者安全产生影响.
科学领域:
- 生物医学工程 生物医学工程
- 医学成像物理 医学成像物理
- 电磁学 电磁学 电磁学 电磁学
背景情况:
- 磁共振成像 (MRI) 系统利用强大的射频 (RF) 场.
- 在MRI扫描期间,为体内设备提供连续电源是一个重大挑战.
- 在MRI环境中为设备供电的现有方法通常是有限的或侵入性的.
研究的目的:
- 调查在MRI中使用发射射频场作为近场设备的无线电源的可行性.
- 开发一种收获射频能量的方法,而不会影响MRI图像质量或患者安全.
- 通过无线电源传输,使体上设备在MRI检查期间可以使用.
主要方法:
- 使用共振线圈和射频感应实现了射频电源采集.
- 使用电磁模拟设计了一个选择性屏蔽,以取消收割机引起的射频场扭曲.
- 屏蔽式收割机进行了实验室测试,随后在标准扫描序列中在3TMRI系统中进行了评估.
主要成果:
- 电磁模拟证实了选择性屏蔽概念的有效性.
- 实验室测试表明,集成屏幕具有高效的电力采集能力.
- 在3TMRI系统中,选择性屏蔽有效地最小化了射频干扰,允许在不降低图像质量的情况下,在幻影旁边获得高达100mW的收获功率.
结论:
- 选择性屏蔽是一种可行的技术,可以在MRI环境中"偷偷"收集射频能量.
- 这项技术可以在MRI过程中为体内医疗设备提供可靠的无线电源.
- 开发的方法为提高可穿戴设备在先进医学成像中的功能提供了一个有希望的解决方案.
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