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Proton (¹H) NMR: Chemical Shift

Proton (¹H) NMR: Chemical Shift

Organic molecules primarily contain carbon and hydrogen atoms. While all the hydrogen isotopes are NMR-active, protium or hydrogen-1 is the most abundant. It has a significant energy separation between its nuclear spin states due to its large gyromagnetic ratio. As per Boltzmann's distribution, an increase in the energy separation implies a greater excess population of nuclei available for excitation, resulting in a strong NMR absorption signal.
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2D NMR: Overview of Homonuclear Correlation Techniques

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Proteomics

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2D NMR: Overview of Heteronuclear Correlation Techniques

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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...

¹H NMR of Labile Protons: Deuterium (²H) Substitution

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This lesson illustrates the role of deuterium substitution in simplifying the NMR spectrum of compounds comprising labile protons. One method employed is the use of deuterium. Amongst the three isotopes of hydrogen, deuterium (2H) has a nucleus composed of one proton and one neutron. When the D2O solvent is added to a pure dry ethanol solution, its labile proton is substituted with deuterium.

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Quantitative Mapping of Specific Ventilation in the Human Lung using Proton Magnetic Resonance Imaging and Oxygen as a Contrast Agent

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Evaluating quantitative proton-density-mapping methods.

Aviv Mezer¹, Ariel Rokem², Shai Berman¹

¹The Hebrew University of Jerusalem, Edmond and Lily Safra Center for Brain Sciences, Jerusalem, Israel.

Human Brain Mapping

|June 9, 2016

Summary

This summary is machine-generated.

This study introduces a method for quantitative magnetic resonance imaging (qMRI) to accurately measure proton density (PD) in the human brain, reducing instrumental bias for reliable research.

Keywords:

T1 coil sensitivity parallel imaging proton density quantitative magnetic resonance imaging

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Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease

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Published on: December 18, 2016

Area of Science:

Neuroimaging
Biophysics
Medical Physics

Background:

Quantitative magnetic resonance imaging (qMRI) seeks to measure tissue parameters accurately, free from instrumental biases.
Estimating proton density (PD), the concentration of water protons, is crucial for in-vivo human brain analysis.
Instrumental biases, such as coil sensitivity, limit the accuracy of PD measurements.

Purpose of the Study:

To develop and validate a qMRI method for accurate estimation of proton density (PD) in the human brain.
To address the challenge of separating PD from coil sensitivity, a significant instrumental bias.
To enable reliable, multisite comparisons of in-vivo brain tissue parameters.

Main Methods:

Theoretical framework for qMRI to estimate PD.
Simulations to assess method performance under varying noise conditions.
Development of software for PD and coil sensitivity mapping.
Application of regularization techniques using T1-PD relationships to improve accuracy in noisy data.

Main Results:

Multichannel coil data inherently contain information to separate PD and coil sensitivity without noise.
Regularization with T1-PD constraints yields accurate coil sensitivity and PD maps even in the presence of noise.
Demonstrated the feasibility of precise PD quantification in the human brain.

Conclusions:

The developed qMRI approach effectively quantifies proton density, overcoming instrumental biases.
This method enhances the reliability of in-vivo brain tissue analysis and facilitates multisite studies.
Accurate PD measurement is vital for advancing comparative neuroscience and clinical applications.