The Return of the Frequency Sweep: Designing Adiabatic Pulses for Contemporary NMR

Frequency-modulated (FM) pulses that function according to adiabatic principles are becoming increasingly popular in many areas of NMR. Often adiabatic pulses can extend experimental capabilities and minimize annoying experimental imperfections. Here, adiabatic principles and some of the current met...

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Published in:Journal of magnetic resonance (1997) 2001-12, Vol.153 (2), p.155-177
Main Authors: Garwood, Michael, DelaBarre, Lance
Format: Article
Language:English
Subjects:
Brain - anatomy & histology
Brain Mapping
Humans
Magnetic Resonance Spectroscopy - methods
Rotation
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container_title Journal of magnetic resonance (1997)
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creator Garwood, Michael
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description Frequency-modulated (FM) pulses that function according to adiabatic principles are becoming increasingly popular in many areas of NMR. Often adiabatic pulses can extend experimental capabilities and minimize annoying experimental imperfections. Here, adiabatic principles and some of the current methods used to create these pulses are considered. The classical adiabatic rapid passage, which is a fundamental element upon which all adiabatic pulses and sequences are based, is analyzed using vector models in different rotating frames of reference. Two methods to optimize adiabaticity are described, and ways to tailor modulation functions to best satisfy specific experimental needs are demonstrated. Finally, adiabatic plane rotation pulses and frequency-selective multiple spin-echo sequences are considered.
doi_str_mv 10.1006/jmre.2001.2340
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subjects Brain - anatomy & histology
Brain Mapping
Humans
Magnetic Resonance Spectroscopy - methods
Rotation
title The Return of the Frequency Sweep: Designing Adiabatic Pulses for Contemporary NMR
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