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  4. Selective magnetic resonance signal suppression by colored Frank excitation
 
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Selective magnetic resonance signal suppression by colored Frank excitation

Publikationstyp
Journal Article
Date Issued
2020-08
Sprache
English
Author(s)
Görges, Alexander  
Benders, Stefan  
Greferath, Marcus  
Küppers, Markus  
Adams, Michael W. W.  
Blümich, Bernhard  
TORE-URI
http://hdl.handle.net/11420/8635
Journal
Journal of magnetic resonance  
Volume
317
Article Number
106776
Citation
Journal of Magnetic Resonance (317): 106776 (2020-08)
Publisher DOI
10.1016/j.jmr.2020.106776
Scopus ID
2-s2.0-85087105499
PubMed ID
32622240
Inspired by the growing interest in miniaturized NMR devices and their applications in material science as well as in chemical and biological research, low power rf excitation is explored. 1H NMR spectra have been measured with low power Frank excitation and are compared to spectra obtained by single-pulse excitation. Frank excitation consists of a large number of phase-modulated, constant-amplitude rf-pulses. A Frank sequence is divided into packages of discrete phase wavelets that correspond to a scan across a spectral frequency range. The largely coherent excitation is found experimentally to require less power than white noise excitation. The package structure suggests that individual wavelets can be omitted to skip individual frequency regions in the excitation, converting the white Frank excitation into colored Frank excitation. This work explores different approaches of colored, selective Frank excitation for spectroscopy and imaging. It is motivated by the aim to eliminate the rf amplifier from the NMR spectrometer so as to enable further miniaturization of NMR instruments. Colored Frank excitation bears promise as a low-power modality for solvent signal suppression in spectroscopy and motion tagging in magnetic resonance imaging.
Subjects
Frank excitation
Low excitation power
Motion tagging
MRI
NMR spectroscopy
Signal suppression
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