NMR spectroscopy in inhomogeneous B-0 and B-1 fields with non-linear correlation
(2005) In Journal of Magnetic Resonance 175(1). p.1-10- Abstract
- Resolved NMR spectra from samples in inhomogeneous B-0 and B-1 fields can be obtained with the so-called "ex situ" methodology, employing a train of composite or adiabatic z-rotation RF pulses to periodically refocus the inhomogeneous broadening during the detection of the time-domain signal. Earlier schemes relied on a linear correlation between the inhomogeneous B0 and B, fields. Here the pulse length, bandwidth, and amplitude of the adiabatic pulses of the hyperbolic secant type are adjusted to improve the refocusing for a setup with non-linear correlation. The field correlation is measured using a two-dimensional nutation experiment augmented with a third dimension with varying RF carrier frequency accounting for off-resonance effects.... (More)
- Resolved NMR spectra from samples in inhomogeneous B-0 and B-1 fields can be obtained with the so-called "ex situ" methodology, employing a train of composite or adiabatic z-rotation RF pulses to periodically refocus the inhomogeneous broadening during the detection of the time-domain signal. Earlier schemes relied on a linear correlation between the inhomogeneous B0 and B, fields. Here the pulse length, bandwidth, and amplitude of the adiabatic pulses of the hyperbolic secant type are adjusted to improve the refocusing for a setup with non-linear correlation. The field correlation is measured using a two-dimensional nutation experiment augmented with a third dimension with varying RF carrier frequency accounting for off-resonance effects. The pulse optimization is performed with a computer algorithm using the experimentally determined field correlation and a standard adiabatic z-rotation pulse as a starting point for the iterative optimization procedure. The shape of the z-rotation RF pulse is manipulated to provide refocusing for the conditions given by the sample-, magnet-, and RF-coil geometry. (c) 2005 Elsevier Inc. All rights reserved. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/157637
- author
- Topgaard, Daniel LU ; Sakellariou, D. and Pines, A.
- organization
- publishing date
- 2005
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Magnetic Resonance
- volume
- 175
- issue
- 1
- pages
- 1 - 10
- publisher
- Academic Press
- external identifiers
-
- wos:000230050200001
- pmid:15949743
- scopus:19944378854
- pmid:15949743
- ISSN
- 1096-0856
- DOI
- 10.1016/j.jmr.2005.03.006
- language
- English
- LU publication?
- yes
- id
- 7af77ec0-cd4b-4ef7-881d-d835c174f9f1 (old id 157637)
- date added to LUP
- 2016-04-01 16:08:04
- date last changed
- 2022-01-28 17:33:35
@article{7af77ec0-cd4b-4ef7-881d-d835c174f9f1,
abstract = {{Resolved NMR spectra from samples in inhomogeneous B-0 and B-1 fields can be obtained with the so-called "ex situ" methodology, employing a train of composite or adiabatic z-rotation RF pulses to periodically refocus the inhomogeneous broadening during the detection of the time-domain signal. Earlier schemes relied on a linear correlation between the inhomogeneous B0 and B, fields. Here the pulse length, bandwidth, and amplitude of the adiabatic pulses of the hyperbolic secant type are adjusted to improve the refocusing for a setup with non-linear correlation. The field correlation is measured using a two-dimensional nutation experiment augmented with a third dimension with varying RF carrier frequency accounting for off-resonance effects. The pulse optimization is performed with a computer algorithm using the experimentally determined field correlation and a standard adiabatic z-rotation pulse as a starting point for the iterative optimization procedure. The shape of the z-rotation RF pulse is manipulated to provide refocusing for the conditions given by the sample-, magnet-, and RF-coil geometry. (c) 2005 Elsevier Inc. All rights reserved.}},
author = {{Topgaard, Daniel and Sakellariou, D. and Pines, A.}},
issn = {{1096-0856}},
language = {{eng}},
number = {{1}},
pages = {{1--10}},
publisher = {{Academic Press}},
series = {{Journal of Magnetic Resonance}},
title = {{NMR spectroscopy in inhomogeneous B-0 and B-1 fields with non-linear correlation}},
url = {{http://dx.doi.org/10.1016/j.jmr.2005.03.006}},
doi = {{10.1016/j.jmr.2005.03.006}},
volume = {{175}},
year = {{2005}},
}