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相关概念视频

Magnetic Resonance Imaging01:24

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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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Double Resonance Techniques: Overview01:12

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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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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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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.
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相关实验视频

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Registered Bioimaging of Nanomaterials for Diagnostic and Therapeutic Monitoring
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单拍回声平面时间分辨率成像用于多回声功能MRI和无扭曲扩散成像.

Zijing Dong1,2, Lawrence L Wald1,2,3, Jonathan R Polimeni1,2,3

  • 1Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, Massachusetts, USA.

Magnetic resonance in medicine
|October 21, 2024
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概括

一种新的单拍回声平面时间分辨率成像 (ss-EPTI) 技术为动态应用提供无扭曲的多回声成像. 这种先进的方法提高了信号与噪声比率的效率和时间稳定性,增强了MRI扫描.

关键词:
EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI EPTI扩散磁力共振成像 (MRI) 扩散没有扭曲的自由.动态成像图像处理系统多回声fMRI的多回声fMRI.一个单一的射击.

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科学领域:

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

背景情况:

  • 多镜头回声平面时间分辨率成像 (EPTI) 可以实现无扭曲的多回声成像,但受到采集时间和运动灵敏度的限制.
  • 动态成像应用需要具有高时间分辨率的技术,对生理噪声的稳定性,以及改进的信号噪声比 (SNR) 效率.

研究的目的:

  • 为动态成像应用开发EPTI (ss-EPTI) 的单次版本.
  • 与现有方法相比,实现无扭曲,多回声成像,提高SNR效率,提高运动稳定性和更高的时间分辨率.

主要方法:

  • 为单次EPTI (ss-EPTI) 开发了一种新的时空编码策略,以最大限度地减少相位编码闪和回声间隔.
  • 实现了连续读取,最小化了死亡时间,以优化SNR效率.
  • 集成的k-TE部分里叶和同时多切片采集用于进一步加速.

主要成果:

  • ss-EPTI成功地在单一拍摄中提供了标准分辨率的无扭曲,密集采样的多回声图像.
  • 由于增强的运动/生理噪声强度和高效的连续读数,观察到SNR效率的提高.
  • 已证明可以消除动态扭曲,改善时间稳定性,并在fMRI和扩散MRI中的多TE扩散指标中实现TE依赖的功能信息检索.

结论:

  • 单拍EPTI (ss-EPTI) 是一种SNR高效,无扭曲的多回声成像技术,适用于动态应用.
  • ss-EPTI提供了与单拍EPI相比的时间分辨率,同时提供更优质的图像质量和稳定性.
  • 这种技术代表了动态MRI的有价值的新获取工具,增强了功能和扩散成像能力.