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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 9, 2025

Phase Contrast Magnetic Resonance Imaging in the Rat Common Carotid Artery
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背景相位诱导稳定状态效应在使用相位对比MRI测量速度量化.

Carola Fischer1,2, Peter Speier2, Tobias Schaeffter1,3

  • 1Department of Medical Engineering, Technical University of Berlin, Berlin, Germany.

Magnetic resonance in medicine
|October 25, 2024
PubMed
概括

在相对比MRI梯度回声序中稳定状态的干扰会产生背景相位偏移,影响流量定量. 目前的校正方法不足以解决这些平稳状态效应,导致不准确的测量.

关键词:
背景阶段 背景阶段背景阶段校正 背景阶段校正流 流 流 是一种流.流量量化的量化流量.阶段对比的核磁共振成像 (MRI)稳定状态的稳定状态

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相关实验视频

Last Updated: Jun 9, 2025

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科学领域:

  • 磁共振成像 (MRI) 是一种磁共振成像技术.
  • 生物医学工程 生物医学工程
  • 医学物理 医学物理

背景情况:

  • 相对照MRI (PC-MRI) 对于流量量化至关重要.
  • 稳态梯度回声 (GRE) 序列通常用于PC-MRI.
  • 空间变化的背景相位偏移是PC-MRI中已知的限制.

研究的目的:

  • 调查 PC-MRI GRE 序列中稳定状态中断对背景相位偏移的影响.
  • 识别影响背景阶段的序列参数和时间.
  • 为了评估当前背景相位校正算法的有效性.

主要方法:

  • 使用了模拟,幻象研究和体内实验.
  • 研究了不同的破坏方法 (梯度破坏/FISP与梯度+RF破坏/FLASH).
  • 检查了流量编码梯度 (每个TR与每个心电图周期) 和放松时间效应的交错.

主要成果:

  • 模拟和幻影测量显示出很好的一致性.
  • 不同的序列导致了不同的时空和组织依赖的背景阶段.
  • 与FLASH相比,ECG间接和TR间接的FISP收购导致了流速的高估和低估.

结论:

  • 稳定状态效应显著影响PC-MRI的背景阶段测量.
  • 这些影响可能导致不准确的流量量化.
  • 现有的背景相位校正方法不足以解决这些稳定状态诱导的干扰.