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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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相关实验视频

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High-resolution Functional Magnetic Resonance Imaging Methods for Human Midbrain
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人类大脑高分辨率扩散MRI与优化,切片切片,零和第一顺序B0$$ {B}_0 $$闪耀在头部仅有的高梯度MRI系统中

Patricia Lan1, Sherry S Huang2, Chitresh Bhushan3

  • 1MR Clinical Solutions & Research Collaborations, GE HealthCare, Menlo Park, California, USA.

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概括

这项研究引入了用于高分辨率扩散MRI的动态切片B0闪,显著提高图像准确性并减少场的不均性. 这种先进的技术增强了大脑组织中的扩散性特征.

关键词:
扩散磁力共振成像 (MRI) 扩散动态闪闪发光的闪闪发光梯度的非线性是因为梯度的非线性.图像扭曲 图像扭曲 图像扭曲

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科学领域:

  • 磁共振成像是一种磁共振成像技术.
  • 扩散式核磁共振成像 (MRI)
  • 神经成像是一种神经成像.

背景情况:

  • 磁场均性 (B0) 对于高分辨率的扩散MRI至关重要.
  • 现有的静态闪方法在深层脑组织中与B0不均质作斗争.
  • 优化B0场对于准确的扩散参数估计至关重要.

研究的目的:

  • 开发和评估一种选择性脑组织,动态切片B0闪方法.
  • 为了最大限度地减少B0场的不均性,在高分辨率的扩散MRI.
  • 为了提高扩散MRI指标的准确性,例如MD,AD,RD和FA.

主要方法:

  • 将实际的X,Y和Z梯度线圈场合纳入动态切片B0闪计算中.
  • 在扩散MRI (OGSE和PGSE) 采集中单独应用动态闪和标准静态闪.
  • 在幽灵和健康的志愿者中采集的数据使用3TMRI系统,只使用头部线圈.

主要成果:

  • 与静态闪相比,动态闪减少了幽灵中的5-10个声元和人类大脑中的3个声元的声元位移.
  • 观察到MD,AD,RD和FA在关键大脑区域 (额叶,脑干,小脑) 的准确度有所提高.
  • 在幻影中高梯度非线性区域中,减少了B0不均的平方根平均值7 Hz.

结论:

  • 大脑组织选择性,动态切片B0闪有效地提高了高分辨率扩散MRI的扩散性特征.
  • 拟议的方法为扩散指标提供了更高的准确性,这对神经科学研究至关重要.
  • 这种技术有望促进大脑的定量核磁共振.