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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.

Double Resonance Techniques: Overview

Double Resonance Techniques: Overview

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...

NMR Spectrometers: Resolution and Error Correction

NMR Spectrometers: Resolution and Error Correction

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...

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

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...

¹H NMR Signal Multiplicity: Splitting Patterns

¹H NMR Signal Multiplicity: Splitting Patterns

When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...

Atomic Nuclei: Magnetic Resonance

Atomic Nuclei: Magnetic Resonance

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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Related Experiment Video

Updated: Jun 18, 2026

Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease

Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease

Published on: December 18, 2016

Optimized, unequal pulse spacing in multiple echo sequences improves refocusing in magnetic resonance.

Elizabeth R Jenista¹, Ashley M Stokes, Rosa Tamara Branca

¹Department of Chemistry and Center for Molecular and Biomolecular Imaging, Duke University, North Carolina 27708-0346, USA.

The Journal of Chemical Physics

|December 2, 2009

Summary

This summary is machine-generated.

Uhrig dynamic decoupling (UDD) sequences offer improved magnetic resonance imaging contrast compared to conventional methods. Experiments show UDD sequences enhance tissue characterization by better managing decoherence in microstructured environments.

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Registered Bioimaging of Nanomaterials for Diagnostic and Therapeutic Monitoring

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Published on: December 9, 2010

Area of Science:

Quantum computing
Magnetic resonance imaging
Biophysics

Background:

Decoherence in quantum systems limits MRI applications.
Conventional Carr-Purcell-Meiboom-Gill (CPMG) sequences use equal pulse spacing.
Uhrig dynamic decoupling (UDD) sequences offer non-uniform pulse spacing derived from quantum computing principles.

Purpose of the Study:

To investigate the theoretical and experimental advantages of UDD sequences for magnetic resonance imaging (MRI) of structured materials.
To compare UDD sequences with CPMG sequences in terms of T(2)-weighted contrast and spectral density function characterization.
To demonstrate the utility of UDD sequences in biological tissues and in vivo tumor models.

Main Methods:

Analytical derivation of optimal pulse timings for UDD sequences.
Application of UDD and CPMG sequences in MRI experiments on excised tissue and a live mouse tumor model.
Analysis of T(2)-weighted contrast and spectral density functions derived from MRI data.

Main Results:

UDD sequences demonstrate theoretical advantages for MRI in microstructured environments with multi-time-scale fluctuating fields.
Experimental results show UDD sequences produce distinct T(2)-weighted contrast compared to CPMG sequences.
Substantial contrast enhancements were observed in most regions of excised tissue and in vivo tumor models using UDD sequences.

Conclusions:

UDD sequences provide superior performance for MRI of structured materials compared to conventional CPMG sequences.
The improved contrast allows for enhanced characterization of low-frequency spectral density functions.
UDD sequences represent a significant advancement for MRI applications in biological and material sciences.