Prospective frequency correction using outer volume suppression-localized navigator for MR spectroscopy and spectroscopic imaging

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
Chu-Yu LeePhil Lee

Abstract

New frequency correction methods are required to achieve the accurate measurement of frequency drifts in MRS and MRSI. We present a prospective frequency correction method with outer volume suppression (OVS)-based localization and selective water excitation for effective frequency correction with better SNR improvement compared to other techniques. An OVS-localized navigator was developed to prospectively correct frequency drifts during MRS and MRSI measurements. The performance of the navigator was tested on the human brain and a solution phantom for frequency drifts induced by head motion or gradient heating by a preceding DWI experiment at 3T. The OVS-localized navigator could accurately track motion-induced frequency drifts with an RMS error of 0.5 Hz. The SNR of MRS signals was not affected by use of the OVS-localized navigator when compared with and without the navigator (P > 0.05). The frequency drifts induced by DWI experiments were 5.1 ± 0.3 Hz/min during MRSI measurements on humans, resulting in increased spectral linewidth, significant bias in metabolite concentrations, and significantly increased Cramér-Rao lower bounds (P < 0.05). After prospective frequency corrections, the quality of MRSI was recovered to the lev...Continue Reading

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Citations

Mar 30, 2019·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Esau Poblador RodriguezWolfgang Bogner
Sep 19, 2020·NMR in Biomedicine·In-Young ChoiRobin A de Graaf
Jul 28, 2020·Alzheimer's & Dementia : the Journal of the Alzheimer's Association·Eric D VidoniRussell H Swerdlow
Oct 23, 2020·NMR in Biomedicine·Ovidiu C AndronesiAndré van der Kouwe
Jul 28, 2021·NeuroImage·Steve C N HuiRichard A E Edden
Aug 3, 2021·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Peter AdanyPhil Lee

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