A unilateral NMR magnet for sub-structure analysis in the built environment: The Surface GARField

McDonald, P.J.; Aptaker, P.S.; Mitchell, Jonathan; Mulheron, M.

doi:10.1016/j.jmr.2006.11.001

Cited by 58 publications

(27 citation statements)

References 29 publications

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“…As an example, consider portable NMR devices (Eidmann et al, 1996;Prado, 2003;Blümich et al, 2002;Manz et al, 2006;Marble et al, 2006;Marko et al, 2007;McDonald et al, 2007) which opened up the possibility to examine samples on the spot, be it in the field or in archives. While these devices are currently far from capable of producing images comparable to those presented here, the characteristic relaxation parameters or spectral fingerprints they already can measure could become a valuable non-invasive categorisation tool when screening rock samples for embedded fossils.…”

Section: Perspectives For Fossil Mrimentioning

confidence: 99%

Three-dimensional Magnetic Resonance Imaging of fossils across taxa

Mietchen

Aberhan²,

Manz

et al. 2008

Biogeosciences

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Abstract. The frequency of life forms in the fossil record is largely determined by the extent to which they were mineralised at the time of their death. In addition to mineral structures, many fossils nonetheless contain detectable amounts of residual water or organic molecules, the analysis of which has become an integral part of current palaeontological research. The methods available for this sort of investigations, though, typically require dissolution or ionisation of the fossil sample or parts thereof, which is an issue with rare taxa and outstanding materials like pathological or type specimens. In such cases, non-destructive techniques could provide a valuable methodological alternative. While Computed Tomography has long been used to study palaeontological specimens, a number of complementary approaches have recently gained ground. These include Magnetic Resonance Imaging (MRI) which had previously been employed to obtain three-dimensional images of pathological belemnites non-invasively on the basis of intrinsic contrast. The present study was undertaken to investigate whether 1 H MRI can likewise provide anatomical information about nonpathological belemnites and specimens of other fossil taxa. To this end, three-dimensional MR image series were acquired from intact non-pathological invertebrate, vertebrate and plant fossils. At routine voxel resolutions in the range of several dozens to some hundreds of micrometers, these images reveal a host of anatomical details and thus highlight the potential of MR techniques to effectively complement existing methodological approaches for palaeontological investigations in a wide range of taxa. As for the origin of the MR signal, relaxation and diffusion measurements as well as 1 H and 13 C MR spectra acquired from a belemnite suggest intracrystalline water or hydroxyl groups, rather than organic residues.

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Section: Perspectives For Fossil Mrimentioning

confidence: 99%

Three-dimensional Magnetic Resonance Imaging of fossils across taxa

Mietchen

Aberhan²,

Manz

et al. 2008

Biogeosciences

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“…They were able to profile large samples ͑study involved cement hydration and porosity development͒ to a depth of 35-40 mm by moving the magnet. 110 At a distance of 50 mm ͑gradient of 2.9 T / m͒ from the magnet surface, the plane of constant resonance frequency extends over a 130ϫ 100 mm 2 area with a proton resonance frequency of 3.2 MHz.…”

Section: B Nmr Mouse and Other Non-well-logging Systemsmentioning

confidence: 99%

Magnetic resonance in porous media: Recent progress

Song

Cho²,

Hopper³

et al. 2008

The Journal of Chemical Physics

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The anomalous adsorbate dynamics at surfaces in porous media studied by nuclear magnetic resonance methods. The orientational structure factor and Lévy walks J. Chem. Phys. 109, 6929 (1998) Recent years have seen significant progress in the NMR study of porous media from natural and industrial sources and of cultural significance such as paintings. This paper provides a brief outline of the recent technical development of NMR in this area. These advances are relevant for broad NMR applications in material characterization.

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“…Because of this uniform fi eld spot, it should also perform well when measuring T 2 and the parameters derived from it, such as the diffusion constant. McDonald [10] and Marble [11] have presented different versions of such a unilateral magnet, while Callaghan ' s group has also developed a device that is closely related to ours [12] .…”

Section: Shrinking Nmrmentioning

confidence: 99%

Musings on Hardware Advances and New Directions

Fukushima

2008

Magnetic Resonance Microscopy

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A unilateral NMR magnet for sub-structure analysis in the built environment: The Surface GARField

Cited by 58 publications

References 29 publications

Three-dimensional Magnetic Resonance Imaging of fossils across taxa

Three-dimensional Magnetic Resonance Imaging of fossils across taxa

Magnetic resonance in porous media: Recent progress

Musings on Hardware Advances and New Directions

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