Spin-lattice relaxation in multiple-pulse experiments as contrast parameter in NMR imaging of solids |
| |
Authors: | D. E. Demco F. Weigand C. Fülber X. Filip C. Filip |
| |
Affiliation: | 1. Max-Planck Institut für Polymerforschung, Mainz, Germany 2. Department of Physics, Technical University, 3400, Cluj-Napoca, Romania 3. Institute of Isotopic and Molecular Technology, Clui-Napoca, Romania
|
| |
Abstract: | The molecular motion contrast parameter for NMR imaging of solids and quasi-solids based on the spin-lattice relaxation (T leff) in multiple-pulse experiments is discussed. For Ostroff-Waugh multiple-pulse sequence theT leff contrast parameter is evaluated in slow and fast molecular motion regime and compared with spin-lattice relaxation in the rotating frame contrast parameter. It is shown thatT leff is offering a good molecular motion contrast in NMR imaging of polymer systems. The radio-frequency pulse scheme forT leff-imaging using magic-echo phase-encoding procedure for recording spatial distribution in solids is introduced. A method forT leff-weighted imaging using gradient spin-echo valid for weak dipolar solids is also discussed. The one-dimensional protonT leff image using Ostroff-Waugh pulse sequence in combination with frequency-encoding imaging procedure is presented for a phantom of poly(ethyleneoxide) and poly(methylmethacrylate). The distribution of mechanical stresses in a acrylate film on glass is investigated by protonT leff-imaging. A proton spin-density image weighted byT leff, for a mixture of two elastomers with different crosslink density is also shown. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|