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dc.contributor.advisor Warren, Warren S. en_US
dc.contributor.author Stokes, Ashley Marie en_US
dc.date.accessioned 2012-09-04T13:15:06Z
dc.date.available 2013-08-30T04:30:05Z
dc.date.issued 2012 en_US
dc.identifier.uri http://hdl.handle.net/10161/5786
dc.description Dissertation en_US
dc.description.abstract <p>This dissertation reports advances in magnetic resonance imaging (MRI), with the ultimate goal of improving signal and contrast in biomedical applications. More specifically, novel MRI pulse sequences have been designed to characterize microstructure, enhance signal and contrast in tissue, and image functional processes. Using these pulse sequences, intermolecular multiple quantum coherence (iMQC) signals that arise from the dipolar field over well-defined distances can be observed; these signals were used here to probe material microstructure. Using iMQCs, the restricted diffusion in uni- and multi-lamellar vesicles such as liposomes and polymersomes was characterized, with potential applications for monitoring drug transport and release; moreover, mesoscopic anisotropy in developing rat brains was studied, which required significant pulse sequence optimizations and corrections to the original dipolar field framework. We have also developed and applied modified multipulse echo sequences with optimized interpulse delays for tissue imaging. These sequences have enhanced the signal and may provide new contrast in various tissues, including normal, tumor, and fatty tissues. Finally, the use of MRI to study functional processes, including temperature and perfusion, is described.</p> en_US
dc.subject Chemistry en_US
dc.subject Physical chemistry en_US
dc.title Development of Advanced MRI Methods for Improving Signal and Contrast in Biomedical Imaging Applications en_US
dc.type Dissertation en_US
dc.department Chemistry en_US
duke.embargo.months 12 en_US

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