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Related Concept Videos

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.
2.6K
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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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: 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...
861
Atomic Spectroscopy: Effects of Temperature01:27

Atomic Spectroscopy: Effects of Temperature

1.1K
Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature...
1.1K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.8K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
3.8K
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

2.3K
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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Related Experiment Video

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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Multi-spin echo spatial encoding provides three-fold improvement of temperature precision during intermolecular zero

Ryan M Davis1, Zijian Zhou1, Hyunkoo Chung2

  • 1Duke University, Durham, North Carolina, USA.

Magnetic Resonance in Medicine
|June 17, 2015
PubMed
Summary

A new pulse sequence, MSE-HOT, enhances magnetic resonance imaging (MRI) for temperature mapping. This method improves signal-to-noise ratio (SNR), offering more precise measurements for applications like hyperthermia monitoring.

Keywords:
Carr-Purcell-Meiboom-Gillintermolecular multiple quantum coherencered bone marrowtemperature imaging

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biophysics

Background:

  • Intermolecular multiple quantum coherences (iMQCs) offer valuable MRI contrast for temperature imaging and other applications.
  • Current iMQC methods are limited by signal-to-noise ratio (SNR).

Purpose of the Study:

  • To develop an improved pulse sequence for detecting intermolecular zero quantum coherences (iZQCs) with enhanced SNR.
  • To enhance the precision and accuracy of temperature measurements using iMQCs.

Main Methods:

  • Modified the HOMOGENIZED with off resonance transfer (HOT) pulse sequence by incorporating a multi-spin echo spatial encoding (MSE) scheme, creating MSE-HOT.
  • Employed echo averaging and J-coupling suppression in methylene protons of fat to improve SNR.
  • Quantified MSE-HOT performance by measuring temperature accuracy and precision during ex vivo red bone marrow hyperthermia.

Main Results:

  • MSE-HOT demonstrated a three-fold improvement in temperature precision compared to previous sequences.
  • Achieved a temperature measurement accuracy of 0.6°C.
  • Identified echo averaging and J-coupling suppression as key factors for precision enhancement.

Conclusions:

  • The MSE-HOT pulse sequence significantly enhances temperature accuracy and precision.
  • MSE-HOT performance is sufficient for monitoring bone marrow hyperthermia.
  • This advancement broadens the applicability of iMQC-based MRI techniques.