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相关概念视频

NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

1.1K
NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
1.1K
Nuclear Magnetic Resonance (NMR): Overview01:07

Nuclear Magnetic Resonance (NMR): Overview

2.5K
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.
NMR spectroscopy generates a spectrum where the characteristic absorption frequencies of the sample are...
2.5K
Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

5.1K
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...
5.1K
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

657
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...
657
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

695
When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
695
Applications Of NMR In Biology01:25

Applications Of NMR In Biology

3.7K
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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相关实验视频

Updated: Jul 2, 2025

Whole-body Mass Spectrometry Imaging by Infrared Matrix-assisted Laser Desorption Electrospray Ionization IR-MALDESI
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Whole-body Mass Spectrometry Imaging by Infrared Matrix-assisted Laser Desorption Electrospray Ionization IR-MALDESI

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多通道磁共振光谱图形用户界面 (McMRSGUI)

Travis Carrell1, Mary P McDougall1

  • 1Department of Biomedical Engineering, Texas A&M University, College Station, Texas, United States of America.

PloS one
|February 28, 2024
PubMed
概括

本研究介绍了McMRSGUI,这是一个免费软件工具,结合了多通道磁共振光谱 (MRS) 数据. 它提高了光谱质量和可靠性,帮助研究人员进行数据分析和解释.

科学领域:

  • 医疗成像医学成像
  • 频谱学是一种光谱学.
  • 软件开发 软件开发

背景情况:

  • 多通道磁共振光谱 (MRS) 产生复杂的数据,需要复杂的处理.
  • 来自各种来源的多通道MRS数据的结合可以提高光谱质量,但在方法选择方面存在挑战.
  • 现有的工具可能缺乏综合方法来组合和评估多道MRS数据.

研究的目的:

  • 介绍McMRSGUI,一个基于MATLAB的开源GUI,用于处理和结合多通道MRS数据.
  • 整合基于文献的方法和决策树过程来选择最佳的组合技术.
  • 通过模拟来验证软件在提高光谱质量和可靠性的性能.

主要方法:

  • 开发基于MATLAB的GUI (McMRSGUI),用于加载,预处理,组合和导出多通道MRS数据.
  • 实施以文献方法为指导的决策树,用于选择光谱组合技术.
  • 使用模拟的多通道光谱进行验证,以评估不同组合方法的光谱扭曲和信号噪声比 (SNR).

主要成果:

  • McMRSGUI成功地结合了多通道的MRS数据,提高了光谱质量和可靠性.
  • 模拟证实了软件能够最大限度地减少光谱扭曲的能力,并验证了基于文献的SNR值.

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  • 光谱峰值扭曲模拟作为估计光谱SNR和指导组合技术选择的工具.

    • 结论:

    • McMRSGUI为研究人员使用多道MRS数据提供了一个有价值的,用户友好的工具包.
    • 该软件有助于对不同组合技术进行比较,从而改善了光谱分析.
    • 它使研究人员能够评估潜在的光谱扭曲,并优化数据处理工作流.