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相关概念视频

Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Mutual Inductance01:24

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Inductance is the property of a device that tells us how effectively it induces an emf in another device. In other words, it is a physical quantity that expresses the effectiveness of a given device.
When two circuits carrying time-varying currents are close to one another, the magnetic flux through each circuit varies because of the changing current in the other circuit. Consequently, an emf is induced in each circuit by the changing current in the other. Therefore, this type of emf is called...
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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Double Resonance Techniques: Overview01:12

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Induction01:16

Induction

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An emf is induced when the magnetic field in a coil is changed by pushing a bar magnet into or out of the coil. emfs of opposite signs are produced by motion in opposite directions, and the directions of emfs are also reversed by reversing poles. The same results are produced if the coil is moved rather than the magnet—it is the relative motion that is important. The faster the motion, the greater the emf. Additionally, there is no emf when the magnet is stationary relative to the coil.
A...
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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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相关实验视频

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Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
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响应感应合网络用于人类尺寸的磁粒子成像.

Fabian Mohn1,2, Fynn Förger1,2, Florian Thieben1,2

  • 1Institute for Biomedical Imaging, Hamburg University of Technology, 21073 Hamburg, Germany.

The Review of scientific instruments
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这项研究引入了用于磁粒子成像 (MPI) 系统的新型感应合网络,提高了患者的安全性和信号质量. 新设计优化了驱动场发生器,以提高人类尺寸扫描仪的性能.

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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
  • 电气工程 电气工程

背景情况:

  • 磁粒子成像 (MPI) 需要精确控制磁场进行成像.
  • 人类尺寸的MPI系统需要在kHz范围内运行的高电流驱动场发生器.
  • 有效的匹配和调对于功率放大器,过器和驱动场发生器至关重要.

研究的目的:

  • 为人类大小的MPI扫描仪开发一个安全高效的感应合网络.
  • 为了实现浮动潜力,以确保患者安全,并为共振变压器实现高线性/增益.
  • 优化驱动场发生器的设计,以提高MPI性能.

主要方法:

  • 采用了对称拓和基于变压器的感应合网络.
  • 使用一种新的系统方法来设计一个损失优化的共振圆形体,其截面为D字形.
  • 用细分来调整电感与电阻的比率,同时保持恒定的质量因子.
  • 为对称的发送接收电路推导出了一个特定的匹配条件.
  • 研究了多个驱动场通道的脱和变压器主侧的优化.

主要成果:

  • 感应合网络的两个原型被建造和测量.
  • 实验结果与衍生理论和模拟进行了比较.
  • 该设计实现了浮动潜力,提高了患者的安全性.
  • 实现了对共振变压器的高线性和增益.
  • 该系统证明了基本频率的有效过,可以同时传输和接收信号.

结论:

  • 开发的感应合网络对于人体大小的MPI系统是有效的.
  • 这种新的设计方法确保了患者的安全,并改善了信号传输和接收.
  • 这些发现有助于推进更安全,更有效的MPI技术.