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相关概念视频

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

213
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
213

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相关实验视频

Updated: Jul 6, 2025

Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
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在多切片多回声旋转回声T2映射中减轻切片交叉对话.

Ekaterina A Brui1, Zilya Badrieva1, Charles-Alexis de Mayenne2

  • 1School of Physics and Engineering, ITMO University, Saint-Petersburg, Russia.

Magnetic resonance in medicine
|December 29, 2023
PubMed
概括
此摘要是机器生成的。

在多切片MESE成像中直接和导致T2切片间变化. 一种用于T2地图重建的新的多切片字典方法显著减少了这种变异,提高了MRI扫描的准确性.

关键词:
T2映射的映射 T2映射的映射的映射直接的和效应 直接的和效应反响调制曲线的回声调制曲线.跨切片T2变化的T2变化.定量的MRI是指MRI的数量.切片交叉通话 切片交叉通话

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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.
  • 生物医学工程 生物医学工程
  • 医学物理 医学物理

背景情况:

  • 多切片多回声旋转回声 (MESE) 序列用于MRI.
  • 准确的T2映射对于各种诊断应用至关重要.
  • 在标准方法中存在T2量化中切片间变化的潜力.

研究的目的:

  • 在多切片MESE成像中研究T2切片间变异.
  • 开发一种增强的T2地图重建方法来纠正这些变化.

主要方法:

  • 用布洛赫模拟来模拟多切片MESE序列中的磁化变化,考虑直接和效应.
  • 实验幻影和体内扫描验证了模拟结果.
  • 开发了一种基于多片词典的重建方法,使用多片回声调制曲线 (EMC).

主要成果:

  • 直接和被证明会偏向EMC,导致T2切片间变化在体内高达2.8%.
  • 增加切片间隙或重复时间 (TR) 减少了这种变化.
  • 拟议的多切片词典方法将变化系数 (CV) 降低到幻体的0.54%,而体内则降低到2.3%.

结论:

  • 从使用单片字典的多片 MESE 图像进行标准 T2 量化容易产生偏差.
  • 一种专门的多切片EMC方法与适当的字典有效地减少了切片T2间的变化.
  • 这种增强的方法提高了多切片MRI中T2映射的准确性.