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231225s2020 xx |||||o 00| ||eng c |
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|a 10.1002/mrc.5038
|2 doi
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|a eng
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|a Taugeron, Pierre
|e verfasserin
|4 aut
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|a Profiles of paint layer samples obtained in the fringe field of a high field magnet by means of very short broadband frequency-modulated pulses
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|c 2020
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|a Text
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Revised 07.12.2020
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2020 John Wiley & Sons, Ltd.
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|a In this article, we describe the acquisition of depth profiles, in particular of paint layers, in the static gradient of a high field magnet, providing a superior sensitivity. The main objective are reference profiles that help to understand scans made with noninvasive unilateral nuclear magnetic resonance (NMR), which often suffers from poor signal-to-noise ratio when working with real samples. Various technical aspects like the coil geometry and the limit of resolution are investigated. A major advancement is the use of frequency-modulated pulses that are very broadband and at the same time very short (25 μs). The latter is necessary to allow the acquisition of a CPMG echo train of old, rigid paint material. Despite being far from adiabatic, they provide uniform excitation and refocusing over 1 MHz, which corresponds to about 400 μm with the used gradient. We show that the uniformity is even sufficient to obtain biexponential relaxation profiles. With these tools, a paint sample from a restoration campaign is analyzed with different contrast criteria: The original and two layers from former restoration attempts can be visualized, and furthermore, the relaxation profiles allow to study the migration of plasticizing molecules
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|a Journal Article
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|a 1H
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|a NMR
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|a depth profiles
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|a frequency-modulated pulses
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|a paint
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|a Bricaud, Sullivan
|e verfasserin
|4 aut
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|a Kehlet, Cindie
|e verfasserin
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|a Dittmer, Jens
|e verfasserin
|4 aut
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|i Enthalten in
|t Magnetic resonance in chemistry : MRC
|d 1985
|g 58(2020), 9 vom: 12. Sept., Seite 870-879
|w (DE-627)NLM098179667
|x 1097-458X
|7 nnns
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|g volume:58
|g year:2020
|g number:9
|g day:12
|g month:09
|g pages:870-879
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|u http://dx.doi.org/10.1002/mrc.5038
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