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Related Concept Videos

Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

1.0K
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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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
1.0K
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...
537
Nuclear Magnetic Resonance (NMR): Overview01:07

Nuclear Magnetic Resonance (NMR): Overview

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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.
NMR spectroscopy generates a spectrum where the characteristic absorption frequencies of the sample are...
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Applications Of NMR In Biology01:25

Applications Of NMR In Biology

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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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Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere
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Multinuclear absolute magnetic resonance thermometry.

Emilia V Silletta1,2,3, Alexej Jerschow1, Guillaume Madelin4

  • 1New York University, Department of Chemistry, 100 Washington Square E, New York, NY 10003, USA.

Communications Physics
|October 19, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces a new multinuclear magnetic resonance (MR) thermometry method for precise absolute temperature measurement. By analyzing hydrogen and sodium nuclei frequency shifts, it overcomes limitations of existing techniques for medical imaging.

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Area of Science:

  • Biomedical Engineering
  • Medical Imaging Physics
  • Nuclear Magnetic Resonance

Background:

  • Non-invasive absolute temperature measurement is crucial for diagnosing pathologies and monitoring thermal therapies.
  • Proton magnetic resonance (MR) frequency shift allows relative temperature mapping but struggles with absolute measurements due to field variations.
  • A stable internal reference is needed for accurate absolute MR thermometry.

Purpose of the Study:

  • To develop a novel multinuclear MR thermometry method for accurate absolute temperature determination.
  • To establish a one-to-one mapping between nuclear precession frequency differences and absolute temperature.
  • To validate the method in various phantoms and ex vivo biological tissues.

Main Methods:

  • Utilized a multinuclear approach comparing hydrogen and sodium nuclei frequency shifts.
  • Explored the unique temperature and electrolyte concentration-dependent frequency characteristics of both nuclei.
  • Conducted proof-of-concept experiments in aqueous solutions, agarose gels, and ex vivo mouse tissues.
  • Employed one-dimensional chemical shift imaging for validation.

Main Results:

  • Demonstrated a reliable one-to-one correlation between the precession frequency difference of hydrogen and sodium nuclei and absolute temperature.
  • Achieved accurate temperature measurements in diverse experimental setups.
  • Showed excellent agreement between MR thermometry results and infrared measurements in 1D chemical shift imaging.

Conclusions:

  • The proposed multinuclear MR thermometry method enables accurate, non-invasive absolute temperature measurement.
  • This technique overcomes the limitations of single-nucleus methods by providing an internal frequency reference.
  • The findings support the potential of this method for clinical applications in thermal dose evaluation and pathology characterization.