Forward Modeling Steady-State Free Precession in Surface NMR
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Le tri à trois modèles
les 1 000 travaux triés →Les trois modèles l'ont jugé hors champ.
Geophysics paper deriving a forward model for steady-state free precession in surface NMR; the object is a subsurface sensing technique.
This develops and validates a surface NMR forward model for geophysical measurement, not research methodology as an object.
Geophysical method paper on surface NMR SSFP forward modeling; domain technique, not research evaluation.
Résumé
In efforts to map water at depth, steady-state free-precession (SSFP) sequences promise to rapidly increase data acquisition rates in the practice of surface nuclear magnetic resonance (NMR). Unlike conventional surface NMR excitation schemes, pulses in SSFP are transmitted so frequently that the nuclear magnetization of hydrogen in water can not return to its natural alignment with the earth’s ambient magnetic field, and instead achieve a steady-state; a dynamic equilibrium between pulses. Unfortunately, the traditional formulations of SSFP sequences and the full surface NMR forward models are not immediately compatible with each other. Firstly, the traditional analysis of SSFP sequences assume that relaxation during pulse (RDP) effects are negligible, which is not always valid in surface NMR. Secondly, even for single pulse measurements, the surface NMR forward model can be computationally demanding; this challenge scales with the number of pulses. Here we investigate the incorporation of RDP effects on the dynamic equilibrium of SSFP measurements. This is then incorporated into the full surface NMR forward model by deriving analytical expressions to directly predict processed surface NMR data. The model is validated by jointly inverting an extensive and diverse suite of SSFP measurements; 12 distinct sequences each with 16 pulse moments. The inverted model has a data misfit of 0.99 and is consistent with models derived from standard NMR data. The ability of our forward model to reproduce diverse signals and jointly invert them is a strong indication of its validity.
Conservé avec la notice de tri, où il sert de preuve aux étiquettes ci-dessus.
La notice
- Revue
- IEEE Transactions on Geoscience and Remote Sensing
- Thématique
- NMR spectroscopy and applications
- Domaine
- Physics and Astronomy
- Établissements canadiens
- —
- Organismes subventionnaires
- Natural Sciences and Engineering Research Council of CanadaVillum Fonden
- Mots-clés
- PrecessionSteady state (chemistry)Nuclear magnetic resonancePhysicsChemistryCondensed matter physics
- Résumé présent dans OpenAlex
- oui