Publication

Slow Diffusion by Singlet State NMR Spectroscopy

Geoffrey Bodenhausen, Simone Cavadini
2005
Journal Articles

Résumé

Small diffusion coeffs. can be measured by using populations of singlet states that have a relaxation time const., Ts, which can be much longer than the longitudinal relaxation time, T1. Spatial information can be encoded with pulsed field gradients in the manner of stimulated echo sequences. Singlet states can be excited via double-quantum coherence to enhance the efficiency of phase encoding and decoding. [on SciFinder (R)]

Source officielle

https://infoscience.epfl.ch/entities/publication/4da96139-73d7-470a-bb96-d814ef98413a

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Geoffrey Bodenhausen, Simone Cavadini
2005
Journal Articles

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/4da96139-73d7-470a-bb96-d814ef98413a

À propos de ce résultat

Concepts associés (20)

Spin–lattice relaxation

During nuclear magnetic resonance observations, spin–lattice relaxation is the mechanism by which the longitudinal component of the total nuclear magnetic moment vector (parallel to the constant magnetic field) exponentially relaxes from a higher energy, non-equilibrium state to thermodynamic equilibrium with its surroundings (the "lattice"). It is characterized by the spin–lattice relaxation time, a time constant known as T1.

In vivo magnetic resonance spectroscopy

In vivo magnetic resonance spectroscopy (MRS) is a specialized technique associated with magnetic resonance imaging (MRI). Magnetic resonance spectroscopy (MRS), also known as nuclear magnetic resonance (NMR) spectroscopy, is a non-invasive, ionizing-radiation-free analytical technique that has been used to study metabolic changes in brain tumors, strokes, seizure disorders, Alzheimer's disease, depression, and other diseases affecting the brain. It has also been used to study the metabolism of other organs such as muscles.

Spin echo

In magnetic resonance, a spin echo or Hahn echo is the refocusing of spin magnetisation by a pulse of resonant electromagnetic radiation. Modern nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI) make use of this effect. The NMR signal observed following an initial excitation pulse decays with time due to both spin relaxation and any inhomogeneous effects which cause spins in the sample to precess at different rates. The first of these, relaxation, leads to an irreversible loss of magnetisation.

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Publications associées (31)

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