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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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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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Magnetic Field Of A Current Loop01:16

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Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
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Magnetic Field Due to Two Straight Wires01:18

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Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
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Magnetic Field Due To A Thin Straight Wire01:28

Magnetic Field Due To A Thin Straight Wire

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Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
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Magnetic Field of a Solenoid01:18

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A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero.
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相关实验视频

Updated: Jun 13, 2025

MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T
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结合堆叠体积射频线圈用于低场开放式MRI成像.

Yunkun Zhao1, Aditya A Bhosale1, Xiaoliang Zhang1,2

  • 1Department of Biomedical Engineering, State University of New York at Buffalo, Buffalo, NY, United States.

medRxiv : the preprint server for health sciences
|September 10, 2024
PubMed
概括

一个新的合堆叠体积线圈通过提高信号噪声比率和射频场均性来增强低场开放式MRI. 这种创新的射频 (RF) 线圈设计提供了更高的效率和更简单的构造,以实现更广泛的MRI可访问性.

关键词:
射频线圈的射频线圈头部核磁共振成像 (MRI) 的成像低距离的低场运动.多模式射频线圈堆叠上线圈的线圈.卷轴的体积线圈.

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相关实验视频

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科学领域:

  • 磁共振成像 (MRI) 是一种磁共振成像技术.
  • 射频 (RF) 线圈设计
  • 医学成像技术 医学成像技术

背景情况:

  • 低场开放式MRI系统 (<1特斯拉) 增加了可访问性,但面临着诸如低信号对噪声比率等挑战.
  • 专用射频 (RF) 线圈的有限可用性阻碍了低场MRI性能.
  • 需要创新的射频线圈设计,以提高低场MRI的成像质量和诊断能力.

研究的目的:

  • 引入了一种新型的合堆叠式体积线圈,用于低场开放式MRI.
  • 在低场MRI应用中解决传统鸟线圈的局限性.
  • 提高发送/接收效率和射频场均性.

主要方法:

  • 连接堆叠体积线圈的设计和理论探索.
  • 线圈架构的优化,以提高发送/接收效率和场均性.
  • 实验验证,包括电磁模拟和实验室测试.

主要成果:

  • 结合堆叠体积线圈在模拟中显示了47.7%的更高的发送/接收效率.
  • 与鸟线圈相比,实现了68%更均的磁场分布.
  • 实验室测试显示,比传统的鸟线圈,B1现场效率高57.3%.

结论:

  • 结合的堆叠体积线圈在B1效率和成像覆盖率方面优于传统的鸟线圈.
  • 为低场MR RF线圈设计提供了强大,简单和实用的解决方案.
  • 提高了低场开放MRI的诊断能力和可访问性.