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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

737
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.
737

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相关实验视频

Updated: Jun 1, 2025

Registered Bioimaging of Nanomaterials for Diagnostic and Therapeutic Monitoring
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同时的多切片扩散成像使用无导航器的多射线螺旋采集.

Yuancheng Jiang1, Guangqi Li1, Xin Shao1

  • 1Center for Biomedical Imaging Research, School of Biomedical Engineering, Tsinghua University, Beijing, China.

Magnetic resonance in medicine
|January 18, 2025
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新方法,用于更快,更高分辨率的扩散成像,使用无导航器的多频段多拍摄均密度螺旋采集和重建. 切片-POCS-ICE算法有效地解决了文物,以提高图像质量.

关键词:
卡伊皮尔 (CAIPI) 是一个多频段成像技术多频段成像技术多射击扩散成像多射击扩散成像没有航海员的自由航海员.切片-POCS-ICE 这是一个很好的方法.一个螺旋式的收购.

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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.
  • 扩散成像是一种扩散成像.
  • 图像重建 图像的重建

背景情况:

  • 多带 (MB) 成像通过同时获得多个切片来加速MRI.
  • 多镜头扩散成像对于高分辨率的扩散权重图像至关重要,但容易发生相位错误.
  • 均密度螺旋 (UDS) 采集为快速成像提供了好处,但需要强大的重建.

研究的目的:

  • 开发一种新的无导航器多频段 (MB) 多射击均密度螺旋 (UDS) 获取和重建技术.
  • 为了证明这种方法对高效,高分辨率的扩散成像的实用性.
  • 为应对MB多拍UDS扩散成像方面的挑战,特别是相位变化和别名化文物.

主要方法:

  • 无线电频脉冲编码被用于用于MB获取并行成像中的受控别名.
  • 开发了一种新的重建算法,切片投射到凸起的集合上,增强相位错误的固有校正 (切片-POCS-ICE).
  • 切片-POCS-ICE算法同时估计每个切片的扩散加权图像和间拍相变化.

主要成果:

  • 与模拟和体内实验中的其他方法相比,切片-POCS-ICE算法证明了相变的更精确估计.
  • 使用拟议的切片-POCS-ICE方法实现了更好的图像质量.
  • 同时解决插射阶段变化和MB切片别名化工件的同时解决成功完成.

结论:

  • 开发的无导航器的MB多拍摄UDS采集和重建方法为扩散成像提供了有效的解决方案.
  • 该技术可实现高效率和高分辨率的扩散成像.
  • 切片-POCS-ICE算法成功地减轻了文物,增强了扩散MRI能力.