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Related Concept Videos

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.
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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...
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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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Atomic Nuclei: Types of Nuclear Relaxation01:28

Atomic Nuclei: Types of Nuclear Relaxation

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Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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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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¹³C NMR: ¹H–¹³C Decoupling01:04

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
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Quantifying Mixing using Magnetic Resonance Imaging
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MC BTS: simultaneously resolving magnetization transfer effect and relaxation for multiple components.

Albert Jang, Hyungseok Jang, Nian Wang

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    This study introduces a new MRI method for accurate tissue quantification, simultaneously measuring relaxation and magnetization transfer effects while correcting for transmit field inhomogeneity. This technique enhances multi-component tissue parameter characterization in complex biological environments.

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    Area of Science:

    • Magnetic Resonance Imaging (MRI)
    • Biophysical Modeling
    • Medical Physics

    Background:

    • Accurate multi-component tissue quantification is crucial for understanding biological systems.
    • Existing MRI methods often struggle with simultaneous assessment of relaxation, magnetization transfer (MT), and transmit field ($B_1^+$) inhomogeneity.
    • Macromolecule-rich tissues present unique challenges for quantitative MRI.

    Purpose of the Study:

    • To develop and validate a novel signal acquisition and modeling framework for comprehensive multi-component tissue quantification.
    • To simultaneously account for transmit field inhomogeneity, multi-component relaxation, and magnetization transfer (MT) effects.
    • To enable robust parameter estimation in vivo.

    Main Methods:

    • An RF-spoiled gradient-echo sequence with off-resonance irradiation and multiple echo-time acquisitions was employed.
    • Simultaneous induction of Bloch-Siegert shift and MT effects during relaxation and spin exchange.
    • A three-pool model was used for parameter estimation, validated by simulations and Monte Carlo analyses.
    • Multi-parameter fitting was performed on in vivo human brain and knee data.

    Main Results:

    • Simulation results demonstrated excellent agreement between the proposed method and the analytical signal equation.
    • Monte Carlo analyses confirmed robust performance across various signal-to-noise ratio conditions.
    • In vivo studies yielded multi-parameter fitting results consistent with existing literature values.

    Conclusions:

    • The proposed framework reliably characterizes multi-component tissue parameters in macromolecule-rich environments.
    • The method effectively compensates for $B_1^+$ inhomogeneity, improving quantitative accuracy.
    • This approach offers a significant advancement in quantitative MRI for biological tissue analysis.