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Related Concept Videos

2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

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Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

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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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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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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...
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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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2D NMR: Overview of Heteronuclear Correlation Techniques01:18

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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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High-resolution Structural Magnetic Resonance Imaging of the Human Subcortex In Vivo and Postmortem
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Localized in vivo high-resolution NMR imaging using gradient subencoding technique.

Z H Cho1, J M Jo

  • 1Department of Electrical Sciences, Korea Advanced Institute of Sciences, Seoul.

Medical Physics
|May 1, 1991
PubMed
Summary
This summary is machine-generated.

A novel spatial localization technique uses a single radiofrequency (rf) pulse and gradient pulses for high-resolution in vivo imaging. This method achieves sub-100-micron resolution, enabling detailed visualization of human knee anatomy.

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Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Radiology

Background:

  • Conventional spatial localization in MRI often requires multiple radiofrequency (rf) pulses.
  • Achieving high-resolution in vivo imaging presents technical challenges for detailed anatomical visualization.

Purpose of the Study:

  • To introduce a new, simplified spatial localization technique for in vivo high-resolution imaging.
  • To demonstrate the efficacy of this technique in achieving sub-100-micron resolution for anatomical imaging.

Main Methods:

  • The technique utilizes a single rf pulse for region selection, unlike multi-pulse methods.
  • Subencoding gradient pulses and convolution processes are employed for localization.
  • Bandwidth restriction in the readout direction, via a low-pass filter, completes the 2-D localization.

Main Results:

  • Localized in vivo high-resolution images of the human knee were successfully obtained.
  • The method achieved an in-plane resolution of 100 x 100 microns.
  • Demonstrated feasibility of sub-100-micron in-plane resolution for in vivo imaging in humans and animals.

Conclusions:

  • The proposed single-rf-pulse spatial localization technique offers a simplified approach to high-resolution in vivo imaging.
  • This method enables unprecedented resolution for detailed anatomical studies in clinical and research settings.
  • The technique holds promise for advancing diagnostic capabilities and preclinical research through enhanced imaging resolution.