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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
161

Rapid Quantitative Body Magnetic Resonance Imaging

Lo, Wei-Ching 23 May 2022 (has links)
No description available.
162

<b>ALGORITHM DEVELOPMENT FOR FUNCTIONAL MAGNETIC RESONANCE IMAGING ANALYSIS AND DIFFUSION TENSOR IMAGING DATA HARMONIZATION</b>

Bradley Jacob Fitzgerald (13783537) 22 April 2024 (has links)
<p dir="ltr">Functional magnetic resonance imaging (fMRI) and diffusion tensor imaging (DTI) via MRI are powerful, noninvasive methods for imaging of the human brain. Here, two studies are presented which explore algorithm development for the processing and analysis of fMRI and DTI-MRI data.</p><p dir="ltr">In the first study, brain functional connectivity was analyzed in a cohort of high school American football athletes over a single play season and compared against participants in non-collision high school sports. Football athletes underwent four resting-state functional magnetic resonance imaging sessions: once before (pre-season), twice during (in-season), and once 34–80 days after the contact activities play season ended (post-season). For each imaging session, functional connectomes (FCs) were computed for each athlete and compared across sessions using a metric reflecting the (self) similarity between two FCs. HAEs were monitored during all practices and games throughout the season using head-mounted sensors. Relative to the pre-season scan session, football athletes exhibited decreased FC self-similarity at the later in-season session, with apparent recovery of self-similarity by the time of the post-season session. In addition, both within and post-season self-similarity was correlated with cumulative exposure to head acceleration events. These results suggest that repetitive exposure to HAEs produces alterations in functional brain connectivity and highlight the necessity of collision-free recovery periods for football athletes.</p><p dir="ltr">In the second study, a method for harmonization of DTI-MRI data across sites was assessed. Pooling of data from multiple sites is limited by noise characteristics of individual scanners and their receive chain elements (e.g., coils, filters, algorithms), requiring careful consideration of methods to harmonize multisite data. Here, the ComBat data harmonization method was assessed on DTI-MRI data to determine if the harmonizing transformation produced by the algorithm could be transferred to harmonize new subject data from previously-observed sites without necessitating reharmonization of pre-existing data. Results indicated that this transferable ComBat methodology (T-ComBat) yielded reduced differences in fractional anisotropy and mean diffusivity across sites when compared with unharmonized data but did not fully reach the performance of ComBat applied to the entire dataset. Results of this study provide guidelines for circumstances (namely, the proportion of subjects one may wish to add to an existing dataset) under which T-ComBat may be effectively applied to harmonize new subject DTI-MRI data.</p>
163

The construction and operation of a nuclear magnetic resonance probe

Prevo, Charles Telman. January 1962 (has links)
LD2668 .T4 1962 P74
164

Optimisation of MRI data for dementia studies

Diaz De Grenu Ballestero, Lara Zurine January 2014 (has links)
No description available.
165

Investigation of microbubbles and MION as intravascular susceptibilitycontrast agents in magnetic resonance imaging

Wong, Ka-kwun, Kelvin., 黃嘉冠. January 2005 (has links)
published_or_final_version / abstract / Electrical and Electronic Engineering / Doctoral / Doctor of Philosophy
166

Advances in parallel imaging reconstruction techniques

Qu, Peng, 瞿蓬 January 2006 (has links)
published_or_final_version / abstract / Electrical and Electronic Engineering / Doctoral / Doctor of Philosophy
167

The measurement of coupling constants and the use of heteronuclear cross-polarisation in NMR experiments for the study of proteins

Richardson, Julia Margaret January 1993 (has links)
No description available.
168

Polymer adsorption at a porous interface

Flower, Andrew January 2000 (has links)
No description available.
169

An '8'9Y and '6'3Cu NMR study of some high-T←c superconductors

Kontos, Athanasios G. January 1994 (has links)
No description available.
170

An NMR study of aqueous isopolytungstate, molybdotungstate and tungstovanadate solutions

Hastings, Jeremy Joseph January 1993 (has links)
No description available.

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