| Project/Area Number |
09650061
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied physics, general
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| Research Institution | University of Tsukuba |
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Principal Investigator |
MATSUI Shigeru University of Tsukuba, Institute of Applied Physics, Assistant Professor, 物理工学系, 講師 (40219366)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 1998: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1997: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | NMR / imaging / magic echo / solid state / image contrast / second moment / cross relaxation time / molecular mobility |
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| Research Abstract |
We have been developing a new method of solid-state NMR imaging by combining high-resolution NMR spectroscopy of solids and NMR imaging of liquids (called MRI). The former technique plays an important role in material sciences while the latter is indispensable for medical sciences. The combined method is based on our magic-echo imaging scheme and is expected to provide a new technique in both the material and medical sciences. Our project focused on the introduction of new image contrasts as well as the improvement of spatial resolution.
Two new contrasts have been introduced in our preliminary experiments : the second moment of proton NMR spectra and 1H-13C cross relaxation time. Both contrasts can reflect molecular mobility and in particular, the cross relaxation time is superior in that it can provide anisotropic information on the molecular mobility The second moment information can be converted to the cross-link density in elastomeric materials. The conversion is currently in progress. Additional experiments also demonstrated that the stringent technical requirement imposed on the field gradient system for the solid-state NMR imaging can be relaxed by modifying the magic-echo imaging sequence. The same spatial resolution can be achieved with a standard field gradient system, which is one order of magnitude slower than the previously needed gradient system.
These results can greatly enhance the utility of the magic echo solid-state NMR imaging and we believe that new facets will be brought about in the characterization of materials by the solid-state NMR imaging.
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