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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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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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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Atomic Nuclei: Magnetic Resonance01:05

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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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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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Related Experiment Video

Updated: Nov 25, 2025

Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging
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Singlet-Contrast Magnetic Resonance Imaging: Unlocking Hyperpolarization with Metabolism*.

J Eills1,2, E Cavallari3, R Kircher4

  • 1Helmholtz Institute Mainz, GSI Helmholtzzentrum für Schwerionenforschung, 64291, Darmstadt, Germany.

Angewandte Chemie (International Ed. in English)
|December 19, 2020
PubMed
Summary

This study introduces a new proton (¹H) imaging method using hyperpolarized fumarate. This technique enables enhanced imaging without relying on low-sensitivity heteronuclei.

Keywords:
MRINMRhyperpolarizationparahydrogensinglet order

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Area of Science:

  • Magnetic Resonance Imaging
  • Biophysical Chemistry
  • Nuclear Magnetic Resonance

Background:

  • Hyperpolarized magnetic resonance imaging (MRI) traditionally uses nuclei like Carbon-13 (¹³C), Nitrogen-15 (¹⁵N), or Xenon-129 (¹²⁹Xe) for enhanced sensitivity.
  • These nuclei are preferred due to their long spin-polarization lifetimes and lack of background proton signals from water and fat.
  • Developing novel hyperpolarization techniques is crucial for advancing in vivo biomolecular studies.

Purpose of the Study:

  • To present a novel ¹H imaging technique utilizing hyperpolarized spin order.
  • To demonstrate a method for releasing hyperpolarized signals through specific biochemical reactions.
  • To enable hyperpolarized imaging without the need for low-abundance heteronuclei.

Main Methods:

  • Production of hyperpolarized fumarate using para-enriched hydrogen gas.
  • Enzymatic conversion of fumarate to malate in Deuterium Oxide (D₂O) to release proton singlet order.
  • Development and application of two pulse sequences for signal rephasing and background suppression in ¹H imaging.

Main Results:

  • Successful generation of hyperpolarized fumarate.
  • Demonstration of enzymatic conversion releasing antiphase NMR signals.
  • Validation of pulse sequences for effective ¹H imaging with background signal suppression.
  • Proof-of-concept for a new hyperpolarized ¹H-imaging modality.

Conclusions:

  • A novel hyperpolarized ¹H-imaging method has been developed, leveraging long-lived singlet states.
  • This technique allows for signal liberation via biochemical reactions, specifically enzymatic conversion.
  • The presented modality offers a promising alternative to traditional hyperpolarized imaging, avoiding the limitations of heteronuclei.