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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

Updated: Jun 24, 2025

Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
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Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease

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使用MRI测量转移函数的改进方法.

Michael A Eijbersen1,2, Bart R Steensma1,2, Cornelis A T van den Berg1,2

  • 1Department of Radiotherapy, University Medical Center Utrecht, Utrecht, The Netherlands.

Magnetic resonance in medicine
|June 11, 2024
PubMed
概括
此摘要是机器生成的。

一种新的MRI方法可以在没有相位假设的情况下准确地评估转移函数,从而使更长的导线和更高的场强度具有更广泛的应用. 这种改进的技术提高了MRI安全性和诊断能力.

关键词:
杰菲门科的方程麦克斯韦的方程 麦克斯韦的方程射频加热 射频加热大小平方最小平方 (MSLS)在安全方面,安全是安全的.转移函数/矩阵的转移函数

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Optogenetic Functional MRI
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Optogenetic Functional MRI

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相关实验视频

Last Updated: Jun 24, 2025

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科学领域:

  • 医疗成像医学成像
  • 电磁学 电磁学 电磁学 电磁学
  • 生物物理学的生物物理.

背景情况:

  • 目前的MRI转移功能的评估依赖于转阶段假设 (TPA).
  • TPA限制适用于较短的线程和较低的电场强度.
  • 对于不同的MRI应用,需要一种更具普遍性的方法.

研究的目的:

  • 开发一种新的基于MRI的转移功能评估方法.
  • 为了克服跨阶段假设 (TPA) 的局限性.
  • 为了提高更长的导线和更高的磁场强度的适用性.

主要方法:

  • 从B1+和B1-两种场分布中确定背景电场.
  • 用于B1字段映射的被破坏的梯度回声多翻转角度采集.
  • 在B1领域建模中采用大小平方最小平方方法.
  • 通过使用电磁模拟数据,幻影实验和实验台测量验证了该方法.

主要成果:

  • 在模拟中精确重建B1场,电流和发生电场.
  • 实验转移函数的确定显示了与模拟的高度相似性.
  • 实验结果表明,尽管有微小的场模型偏差,但传递函数的确切确定.
  • 这种方法对于长度高达40厘米的铜线有效.

结论:

  • 介绍了一种更普遍适用的基于MRI的转移功能评估方法.
  • 新方法避免了相位假设,将使用范围扩展到更长的物体和更高的场强度.
  • 在B1映射和解决方案算法的改进提高了该方法的稳定性.