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相关概念视频

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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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Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
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相关实验视频

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High-resolution Functional Magnetic Resonance Imaging Methods for Human Midbrain
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通过使用元阵列结构在超高场系统中增强大脑MRI.

Akbar Alipour1, Alan C Seifert1, Bradley N Delman2

  • 1BioMedical Engineering and Imaging Institute and Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York City, New York, USA.

Medical physics
|October 24, 2023
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概括

一种新的元阵列通过改善关键大脑区域的信号噪声比 (SNR) 来增强7特斯拉 (7T) 核磁共振扫描. 这项技术提高了图像质量,并可以实现更快的扫描或更高分辨率,以改善神经影像.

关键词:
大脑MRI脑部MRI脑部高通透性的材料具有很高的通透性.这是一个元阵列.无线电频率无线电频率的使用.分环共振器的共振器是分环共振器.超高电场的超高电场.

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科学领域:

  • 医疗成像医学成像
  • 电磁主义 电磁主义
  • 材料科学 材料科学 材料科学

背景情况:

  • 超高波段 (UHF) 磁共振成像 (MRI) 提供更高的信号噪声比 (SNR),但受到射频 (RF) 不同质性的影响,限制了大脑覆盖范围.
  • 现有的解决方案,如并行传输系统和被动闪,有缺点,包括成本,复杂性和材料不稳定性.
  • 超表面,工程电磁结构,显示控制电磁波的希望,并已被探索为MRI增强.

研究的目的:

  • 为了评估一种新型元阵列在增强大脑MRI时的有效性7特斯拉 (7T).
  • 超阵列是分环共振器和高允许度材料的混合体,旨在改善小脑,脑干和下叶在7T的SNR.
  • 评估这项技术对脑MRI图像质量和解剖覆盖的影响.

主要方法:

  • 使用数值电磁模拟来优化元阵列设计和射频电路.
  • 在幽灵和健康志愿者身上进行实验分析,使用7TMRI扫描仪与标准的32通道接收线圈进行了实验.
  • 图像采集是使用渐变回忆回声 (GRE) 和轮回转回声 (TSE) 序列进行的,具有和没有元阵列.

主要成果:

  • 幻影研究表明,目标地区的发射效率增加了两倍,信号灵敏度增加了1.4倍.
  • 在体内成像显示使用元阵列可以改善小脑,脑干和椎脊髓的可视化.
  • GRE和TSE图像显示下层大脑结构的细节增强.

结论:

  • 该元阵列有效地增强了SNR,扩大了解剖覆盖范围,并提高了7T标准MRI线圈的性能.
  • 这种SNR增强允许在相同的采集时间内进行更高分辨率的成像,或者在同等分辨率下更快的扫描.
  • 该技术提供了一种实际的方法来改进现有的7TMRI系统,用于全脑成像和其他应用.