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相关概念视频

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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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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
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Nuclear magnetic resonance (NMR) spectroscopy is a very valuable analytical technique for researchers. It has been used for more than 50 years as an analytical tool. F. Bloch and E. Purcell formulated NMR in 1946 and won the 1952 Nobel Prize in Physics  for their work. Biological macromolecules such as proteins, nucleic acids, lipids, and organic molecules including pharmaceutical compounds, can be studied using this versatile tool that exploits the magnetic properties of certain nuclei.
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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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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.
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纳米钻石增强磁共振成像技术

Jelena Lazovic1, Eberhard Goering2, Anna-Maria Wild1

  • 1Medical Systems Central Scientific Facility, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany.

Advanced materials (Deerfield Beach, Fla.)
|December 1, 2023
PubMed
概括

纳米钻石 (ND) 显示出作为一种新的MRI对比剂的前景. 这些生物相容的纳米颗粒能够在体内清晰地进行细胞跟踪和可视化,而无需显著的毒性.

关键词:
权重为T1的核磁共振成像细胞标签 细胞标签细胞跟踪追踪 细胞跟踪对比剂是一种对比剂.爆炸纳米钻石的爆炸磁共振成像技术的使用纳米钻石是一种纳米钻石.

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科学领域:

  • 生物医学工程 生物医学工程
  • 纳米技术 纳米技术
  • 医疗成像医学成像

背景情况:

  • 纳米钻石 (ND) 为各种应用提供生物相容性和多功能功能.
  • 纳米钻石的结构缺陷可以赋予其磁性特性,使其适用于MRI对比剂.
  • 爆炸纳米钻石特别显示了减少T1放松时间和增强MRI信号的潜力.

研究的目的:

  • 研究纳米钻石作为细胞标记和跟踪的非侵入性成像剂的潜力.
  • 为了评估纳米钻石作为一种新的,没有加多的对比度增强剂,用于磁共振成像 (MRI).

主要方法:

  • 在血管内应用后,胚胎中纳米钻石的体内成像.
  • 在体外可视化和分析纳米钻石标记的巨细胞.
  • 标记后对巨细胞毒性和促炎性细胞因子反应的评估.

主要成果:

  • 在体内对纳米钻石的直接可视化产生了具有高对比度和噪声比率的明亮信号.
  • 在24小时内,在肝脏和脏中观察到增强的MRI信号,这表明被网状内皮系统吸收.
  • 在体外研究证实了巨细胞的纳米钻石标记,没有显著的细胞毒性或增加的促炎性细胞因子.

结论:

  • 纳米钻石作为一种有效的,无加多的MRI对比剂.
  • 纳米钻石显示出在体内细胞标记和跟踪的潜力,特别是对于细胞.
  • 对纳米钻石的进一步研究可以推进基于细胞的治疗和诊断.