Optimal nuclear magnetic resonance excitation schemes for the central transition of a spin 3/2 in the presence of residual quadrupolar coupling

Jae Seung Lee, Ravinder R. Regatte, Alexej Jerschow

Research output: Contribution to journalArticle

Abstract

Optimal control theory is applied for enhancing the intensity of the central peak of a spin 3/2 signal in the presence of a residual quadrupolar coupling. While a maximum enhancement is always possible in the regime ωrf ωQ via the use of modulated and shaped pulses, the intermediate rf-power regime ωrf ∼ ωQ does not admit simple solutions based on intuition. In this work we present optimized shaped pulses that have been derived using an optimization algorithm based on optimal control and test these with 23Na NMR in this regime. In addition to enhancing the intensity of the central transition signal, the satellite peaks can be effectively suppressed, which is a useful feature for the implementation in 23Na imaging sequences.

Original languageEnglish (US)
Article number224510
JournalJournal of Chemical Physics
Volume129
Issue number22
DOIs
StatePublished - 2008

Fingerprint

Intuition
optimal control
Control theory
Magnetic Resonance Spectroscopy
Nuclear magnetic resonance
Satellites
Imaging techniques
nuclear magnetic resonance
control theory
pulses
excitation
optimization
augmentation
Power (Psychology)

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry
  • Medicine(all)

Cite this

Optimal nuclear magnetic resonance excitation schemes for the central transition of a spin 3/2 in the presence of residual quadrupolar coupling. / Lee, Jae Seung; Regatte, Ravinder R.; Jerschow, Alexej.

In: Journal of Chemical Physics, Vol. 129, No. 22, 224510, 2008.

Research output: Contribution to journalArticle

@article{886e853926ed4e71b9653ca9c40e83b4,
title = "Optimal nuclear magnetic resonance excitation schemes for the central transition of a spin 3/2 in the presence of residual quadrupolar coupling",
abstract = "Optimal control theory is applied for enhancing the intensity of the central peak of a spin 3/2 signal in the presence of a residual quadrupolar coupling. While a maximum enhancement is always possible in the regime ωrf ωQ via the use of modulated and shaped pulses, the intermediate rf-power regime ωrf ∼ ωQ does not admit simple solutions based on intuition. In this work we present optimized shaped pulses that have been derived using an optimization algorithm based on optimal control and test these with 23Na NMR in this regime. In addition to enhancing the intensity of the central transition signal, the satellite peaks can be effectively suppressed, which is a useful feature for the implementation in 23Na imaging sequences.",
author = "Lee, {Jae Seung} and Regatte, {Ravinder R.} and Alexej Jerschow",
year = "2008",
doi = "10.1063/1.3036005",
language = "English (US)",
volume = "129",
journal = "Journal of Chemical Physics",
issn = "0021-9606",
publisher = "American Institute of Physics Publising LLC",
number = "22",

}

TY - JOUR

T1 - Optimal nuclear magnetic resonance excitation schemes for the central transition of a spin 3/2 in the presence of residual quadrupolar coupling

AU - Lee, Jae Seung

AU - Regatte, Ravinder R.

AU - Jerschow, Alexej

PY - 2008

Y1 - 2008

N2 - Optimal control theory is applied for enhancing the intensity of the central peak of a spin 3/2 signal in the presence of a residual quadrupolar coupling. While a maximum enhancement is always possible in the regime ωrf ωQ via the use of modulated and shaped pulses, the intermediate rf-power regime ωrf ∼ ωQ does not admit simple solutions based on intuition. In this work we present optimized shaped pulses that have been derived using an optimization algorithm based on optimal control and test these with 23Na NMR in this regime. In addition to enhancing the intensity of the central transition signal, the satellite peaks can be effectively suppressed, which is a useful feature for the implementation in 23Na imaging sequences.

AB - Optimal control theory is applied for enhancing the intensity of the central peak of a spin 3/2 signal in the presence of a residual quadrupolar coupling. While a maximum enhancement is always possible in the regime ωrf ωQ via the use of modulated and shaped pulses, the intermediate rf-power regime ωrf ∼ ωQ does not admit simple solutions based on intuition. In this work we present optimized shaped pulses that have been derived using an optimization algorithm based on optimal control and test these with 23Na NMR in this regime. In addition to enhancing the intensity of the central transition signal, the satellite peaks can be effectively suppressed, which is a useful feature for the implementation in 23Na imaging sequences.

UR - http://www.scopus.com/inward/record.url?scp=57649225581&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=57649225581&partnerID=8YFLogxK

U2 - 10.1063/1.3036005

DO - 10.1063/1.3036005

M3 - Article

C2 - 19071931

AN - SCOPUS:57649225581

VL - 129

JO - Journal of Chemical Physics

JF - Journal of Chemical Physics

SN - 0021-9606

IS - 22

M1 - 224510

ER -