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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

793
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.
793

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相关实验视频

Updated: Jun 26, 2025

Registered Bioimaging of Nanomaterials for Diagnostic and Therapeutic Monitoring
17:16

Registered Bioimaging of Nanomaterials for Diagnostic and Therapeutic Monitoring

Published on: December 9, 2010

10.3K

采用辐射回声平面轨迹的单射扩散痕迹光谱成像.

Andres Saucedo1,2, M Albert Thomas1,2,3

  • 1Radiological Sciences, University of California at Los Angeles, Los Angeles, California, USA.

Magnetic resonance in medicine
|May 10, 2024
PubMed
概括
此摘要是机器生成的。

这项研究展示了一种新的,更快的方法来测量痕迹显微扩散系数 (ADCs),使用一次性扩散痕迹加权辐射回声平面光谱成像 (Trace DW-REPSI). 该技术显示了幻影和体内成像的可行性,提供比传统方法更快的扫描.

关键词:
这就是b-value.扩散权重的权重.在k-空间.点分辨率光谱学是一种点分辨率光谱法.辐射回声平面光谱成像 辐射回声平面光谱成像微量明显扩散系数的痕迹.

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Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules
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相关实验视频

Last Updated: Jun 26, 2025

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科学领域:

  • 磁共振成像是一种磁共振成像技术.
  • 扩散张力成像 扩散张力成像
  • 光谱成像技术的成像

背景情况:

  • 扩散权重成像 (DWI) 对于表征组织微观结构至关重要.
  • 准确量化表面扩散系数 (ADC) 对各种神经学应用至关重要.
  • 传统的DWI方法可能耗时,限制了临床效用.

研究的目的:

  • 为了证明单次射击扩散跟踪加权辐射回声平面光谱成像 (Trace DW-REPSI) 的可行性.
  • 评估Trace DW-REPSI的性能,以量化幽灵和体内微量ADC.
  • 评估使用这种新型序列更快地定量ADC的潜力.

主要方法:

  • 使用3T扫描仪在幽灵和10名健康志愿者身上获取了痕迹DW-REPSI数据集.
  • 使用的最大b值为1601秒/mm2,扩散时间为10.75毫秒.
  • 辐射采集自导航用于相位和频率校正.

主要成果:

  • 幻影痕迹ADC显示出与报告值的良好一致.
  • 在体内ADC与预期的灰质和白质差异有很好的相关性.
  • 在灰色/白色物质中,tNAA,tCr和tCho的额外推算的微量ADC分别在0.18-0.27和0.26-0.38μm2/ms之间.
  • 微量ADC的高估是由于传播时间短.

结论:

  • 这项研究首次展示了单次射击的Trace DW-REPSI序列.
  • 与传统方法相比,Trace DW-REPSI序列可显著减少扫描时间.
  • 这种技术有望在临床环境中高效准确地进行ADC微量估计.