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Advances In Neuroimaging Methods for 7 Tesla Human Brain Magnetic Resonance Imaging

Farhat, Nadim (2023) Advances In Neuroimaging Methods for 7 Tesla Human Brain Magnetic Resonance Imaging. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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7-Tesla (T) magnetic resonance imaging (MRI) is currently the highest-field MRI available for clinical use. It has better spatial resolution and sensitivity than lower-field MRI scanners. High resolution and increased sensitivity can mean shorter scan times, the ability to see small structures and changes in the brain that may not be visible on lower-field MRI scans, and higher temporal resolution for functional MRI (fMRI).
7T MRI has many clinical and research uses, especially for neuroimaging, in targeting neurological, neurodegenerative, and psychiatric conditions. However, it has yet to be widely used, even in centers with these systems. Several factors, such as cost, availability, technical limitations of ultra-high-field MRI (such as signal inhomogeneities and increased power deposition in the tissue), and the need for research and clinical applications, can explain the limited adoption.
In this dissertation, we use the main strengths of 7T MRI, including its high signal-to-noise ratio, increased susceptibility, and contrast for blood oxygenation level-dependent (BOLD) fMRI and high resolution (on the order of hundreds of micrometers), to develop neuroimaging methods that take advantage of these strengths. This dissertation starts by reviewing state of the art in ultra-high-field neuroimaging for small vessel disease and late-life depression. Then, we present a novel approach to connecting microscopic white matter lesion histological characterization with white matter hyperintensities acquired with MRI. Finally, we show that fMRI resting-state functional connectivity may be a neuroimaging marker for sickle cell disease severity and accelerated aging.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Farhat, Nadimnaf34@pitt.edunaf34
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairStetten, Georgestetten@pitt.edustetten
Banihashimi, Laylalayla.banihashemi@pitt.edulayla.banihashemi
Mettenburg, Josephjmm318@pitt.edujmm318
Committee CoChairAizenstein, Howardaizen@pitt.eduaizen
Thesis AdvisorTamer, Tamertibrahim@pitt.edutibrahim
Date: 14 September 2023
Date Type: Publication
Defense Date: 2 June 2023
Approval Date: 14 September 2023
Submission Date: 18 July 2023
Access Restriction: 2 year -- Restrict access to University of Pittsburgh for a period of 2 years.
Number of Pages: 96
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Bioengineering
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: High-field Magnetic Resonance Imaging, Neuroimaging, functional MRI, Sickle Cell disease, White matter hyperintensities, Small Vessel Disease
Date Deposited: 14 Sep 2023 13:43
Last Modified: 14 Sep 2023 13:43


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