Development of a 3-D, multi-nuclear continuous wave NMR imaging system

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• 作者：Andrew J. Fagan ; Gareth R. Davies ; James M.S. Hutchison ; Fredrik P. Glasser and David J. Lurie
• 关键词：Continuous wave ; Multi-nuclear ; 3-D imaging ; Short T₂
• 刊名：Journal of Magnetic Resonance
• 出版年：2005
• 期刊代码：126_10907807
• 类别：ch
• 出版时间：2005
• 卷：176
• 期：2
• 页码：140-150
• 文件大小：438 K

摘要

The development of a 3-D, multi-nuclear continuous wave NMR imaging (CW-NMRI) system is described and its imaging capability is demonstrated on a range of materials exhibiting extremely short T₂ relaxation values. A variety of radiofrequency resonators were constructed and incorporated into a new gradient and field offset coil assembly, while the overall system design was modified to minimise microphonic noise which was present in an earlier prototype system. The chemically combined ²⁷Al in a high temperature refractory cement was imaged, and the CW-NMRI system was found to be sensitive to small differences in ²⁷Al content in these samples. The penetration of ²³Na in salt water into samples of ordinary Portland cement (OPC) was investigated, with enhanced uptake observed for samples with larger pore size distributions. The solid ¹³C component in a carbonated cement sample was also imaged, as were the ⁷Li nuclei in a sample of powdered Li₂CO₃. A spatial resolution of 1 mm was measured in an image of a rigid polymeric material exhibiting a principal value of 16.3 μs. Finally, a high-resolution 3-D image of this rigid polymer is presented.