Publisher DOI: 10.1016/j.jmr.2020.106776
Title: Selective magnetic resonance signal suppression by colored Frank excitation
Language: English
Authors: Görges, Alexander 
Benders, Stefan 
Greferath, Marcus 
Küppers, Markus 
Adams, Michael W. W. 
Blümich, Bernhard 
Keywords: Frank excitation; Low excitation power; Motion tagging; MRI; NMR spectroscopy; Signal suppression
Issue Date: Aug-2020
Source: Journal of Magnetic Resonance (317): 106776 (2020-08)
Abstract (english): 
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.
ISSN: 1090-7807
Journal: Journal of magnetic resonance 
Document Type: Article
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