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相关概念视频

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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...

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脂肪/水分离在7T使用一个3D辐射序列与几乎连续的回声时间.

Matthias Rohe1, Katharina Tkotz1, Armin M Nagel1,2

  • 1Institute of Radiology, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany.

Magnetic resonance in medicine
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概括

这项研究引入了一种新的3D辐射MRI序列,以在7T时可靠地分离脂肪/水. 该方法最大限度地减少了化学转移人工物和脂肪/水交换,这对于超高场成像至关重要.

关键词:
7 特斯拉的测试结果迪克森的核磁共振成像脂肪/水分离的方法质子密度脂肪分数的质子密度几乎连续的 TE.辐射序列的辐射序列

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科学领域:

  • 磁共振成像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:

  • 超高波段 (UHF) 核磁共振,特别是7特斯拉 (7T),提供了增强的信号噪声比和光谱分辨率.
  • 然而,超高频MRI容易出现化学转移等人工物,使精确的脂肪/水分离 (FWS) 变得复杂.
  • 强大的FWS对于定量MRI和准确的组织特征是必不可少的.

研究的目的:

  • 开发和验证一种新的3D辐射MRI序列,采用近连续回声时间 (TE) 采样,以获得可靠的FWS在7T.
  • 实施一个重建工作流程,包括非共振校正和图形切割细分,以改善脂肪和水信号差异化.
  • 评估该序列在幻影和体内测量中的性能,重点是减少人工物和防止脂肪/水交换.

主要方法:

  • 在7T全身MRI系统上实施了3D辐射密度适应序列,并采用了准连续的TE采样.
  • 开发了一种重建工作流程,其中包括非共振校正,以减轻化学转移文物.
  • 使用图形切割算法将脂肪和水信号分开,生成质子密度脂肪分数图. 验证使用幻影和体内下肢扫描进行.

主要成果:

  • 该序列允许采集脂肪/水振荡曲线的样本,最小平均TE为0.27毫秒,最大平均TE为10.13毫秒,具有85微秒的有效TE增量.
  • 非共振校正有效地减少了脂肪信号中的化学转移工件.
  • 幻体脂肪量化显示出高准确度 (1.5%的平均绝对误差),管道在幻体和体内数据中都显示出一致的脂肪/水信号解释,没有交换.

结论:

  • 具有准连续TEs的3D辐射序列在7T时对FWS有效.
  • 高采样率 (有效TE增量<100μs) 提供了对脂肪/水交换的稳定性,这是超高场强度的常见挑战.
  • 这种工作流允许在7T时可靠的定量脂肪分数映射.