Application of adiabatic pulses for magnetic Resonance Sounding – Pulse shapes and resolution

dc.bibliographicCitation.firstPage104079eng
dc.bibliographicCitation.journalTitleJournal of applied geophysicseng
dc.bibliographicCitation.volume179eng
dc.contributor.authorDlugosch, Raphael
dc.contributor.authorMüller-Petke, Mike
dc.date.accessioned2021-11-15T12:10:40Z
dc.date.available2021-11-15T12:10:40Z
dc.date.issued2020
dc.description.abstractMagnetic Resonance Sounding (MRS) can image the spatial distribution of hydrologically relevant parameters in in the subsurface. However, the application of MRS is often limited by its low signal-to-noise ratio. The use of adiabatic excitation pulses show promising features to overcome this limitation. In this work, we study practical considerations when applying adiabatic pulses for MRS, i.e. calculation of the sensitivity kernel for varying pulse shapes and vertical resolution. The pulse shape is crucial for the performance of adiabatic pulses. We investigate the shapes of adiabatic pulses recorded during a MRS and observe small systematic deviations from the theoretical predicted pulse shape and variations between different pulse strengths. We show that the overall impact on the obtained sounding curve and inversion result was small. This enables to limit the time consuming modelling of the spin dynamic to one representative pulse shape, which significantly speeds up the calculation of the sensitivity kernel, necessary for the interpretation of MRS. Additionally, we show that on-resonance excitation generally outperforms adiabatic excitation concerning vertical resolution and depth of investigation (both up to a factor of two). This is true for a wide range of noise conditions. For a very shallow depth interval compared to the loop size, however, adiabatic excitation features improved imaging capabilities. © 2020 The Authorseng
dc.description.versionpublishedVersioneng
dc.identifier.urihttps://oa.tib.eu/renate/handle/123456789/7290
dc.identifier.urihttps://doi.org/10.34657/6337
dc.language.isoengeng
dc.publisherAmsterdam [u.a.] : Elsevier Scienceeng
dc.relation.doihttps://doi.org/10.1016/j.jappgeo.2020.104079
dc.relation.essn0926-9851
dc.relation.essn1879-1859
dc.rights.licenseCC BY-NC-ND 4.0 Unportedeng
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/eng
dc.subject.ddc620eng
dc.subject.ddc660eng
dc.subject.ddc550eng
dc.subject.otherAdiabatic pulseeng
dc.subject.otherMagnetic Resonance Soundingeng
dc.subject.otherNuclear magnetic resonanceeng
dc.subject.otherPulse shapeeng
dc.titleApplication of adiabatic pulses for magnetic Resonance Sounding – Pulse shapes and resolutioneng
dc.typeArticleeng
dc.typeTexteng
tib.accessRightsopenAccesseng
wgl.contributorLIAGeng
wgl.subjectIngenieurwissenschafteneng
wgl.typeZeitschriftenartikeleng
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