dorsal/arxiv
View SchemaNuclear Magnetic Resonance with the Distant Dipolar Field
| Authors | Curtis Andrew Corum |
|---|---|
| Categories | |
| ArXiv ID | physics/0507103 |
| URL | https://arxiv.org/abs/physics/0507103 |
Abstract
Distant dipolar field (DDF)-based nuclear magnetic resonance is an active research area with many fundamental properties still not well understood. Already several intriguing applications have developed, like HOMOGENIZED and IDEAL spectroscopy, that allow high resolution spectra to be obtained in inhomogeneous fields, such as in-vivo. The theoretical and experimental research in this thesis concentrates on the fundamental signal properties of DDF-based sequences in the presence of relaxation (T1 and T2) and diffusion. A general introduction to magnetic resonance phenomenon is followed by a more in depth introduction to the DDF and its effects. A novel analytical signal equation has been developed to describe the effects of T2 relaxation and diffusing spatially modulated longitudinal spins during the signal build period of an HOMOGENIZED cross peak. Diffusion of the longitudinal spins results in a lengthening of the effective dipolar demagnetization time, delaying the re-phasing of coupled anti-phase states in the quantum picture. In the classical picture the unwinding rate of spatially twisted magnetization is no longer constant, but decays exponentially with time. The expression is experimentally verified for the HOMOGENIZED spectrum of 100mM TSP in H2O at 4.7T. Equations have also been developed for the case of multiple repetition steady state 1d and 2d spectroscopic sequences with incomplete magnetization recovery, leading to spatially varying longitudinal magnetization. Experimental verification has been accomplished by imaging the profile. The equations should be found generally applicable for those interested in DDF-based spectroscopy and imaging.
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"abstract": "Distant dipolar field (DDF)-based nuclear magnetic resonance is an active\nresearch area with many fundamental properties still not well understood.\nAlready several intriguing applications have developed, like HOMOGENIZED and\nIDEAL spectroscopy, that allow high resolution spectra to be obtained in\ninhomogeneous fields, such as in-vivo. The theoretical and experimental\nresearch in this thesis concentrates on the fundamental signal properties of\nDDF-based sequences in the presence of relaxation (T1 and T2) and diffusion. A\ngeneral introduction to magnetic resonance phenomenon is followed by a more in\ndepth introduction to the DDF and its effects. A novel analytical signal\nequation has been developed to describe the effects of T2 relaxation and\ndiffusing spatially modulated longitudinal spins during the signal build period\nof an HOMOGENIZED cross peak. Diffusion of the longitudinal spins results in a\nlengthening of the effective dipolar demagnetization time, delaying the\nre-phasing of coupled anti-phase states in the quantum picture. In the\nclassical picture the unwinding rate of spatially twisted magnetization is no\nlonger constant, but decays exponentially with time. The expression is\nexperimentally verified for the HOMOGENIZED spectrum of 100mM TSP in H2O at\n4.7T. Equations have also been developed for the case of multiple repetition\nsteady state 1d and 2d spectroscopic sequences with incomplete magnetization\nrecovery, leading to spatially varying longitudinal magnetization. Experimental\nverification has been accomplished by imaging the profile. The equations should\nbe found generally applicable for those interested in DDF-based spectroscopy\nand imaging.",
"arxiv_id": "physics/0507103",
"authors": [
"Curtis Andrew Corum"
],
"categories": [
"physics.med-ph"
],
"title": "Nuclear Magnetic Resonance with the Distant Dipolar Field",
"url": "https://arxiv.org/abs/physics/0507103"
},
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