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Multimodal Optical Imaging of Seizur...

Ringuette, Dene.

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Multimodal Optical Imaging of Seizure with Flowmetry Stabilization.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Multimodal Optical Imaging of Seizure with Flowmetry Stabilization./
Author:	Ringuette, Dene.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	201 p.
Notes:	Source: Dissertations Abstracts International, Volume: 81-02, Section: B.
Contained By:	Dissertations Abstracts International81-02B.
Subject:	Biomedical engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13427243
ISBN:	9781085758659

Multimodal Optical Imaging of Seizure with Flowmetry Stabilization.
Ringuette, Dene.

Multimodal Optical Imaging of Seizure with Flowmetry Stabilization. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 201 p.

Source: Dissertations Abstracts International, Volume: 81-02, Section: B.

Thesis (Ph.D.)--University of Toronto (Canada), 2019.

This item must not be sold to any third party vendors.

Two novel multimodal optical imaging systems, both providing concurrent full-field blood flow and oxygenation/volume mapping, were developed to investigate epilepsy-related disease models: 1) An epifluorescence microscope-integrated system, permitting simultaneous intracellular calcium imaging and electrographic recording of brain activity and 2) a miniaturized head-mounted system (collaborative work), permitting brain imaging of freely-behaving rats. The microscope-integrated system investigated microvascular dynamics during seizure, revealing large arteriole dilation associated with seizure onset. Furthermore, the electrographically correlated neurovascular seizure responses, intracellular calcium dynamics, and inter-seizure consistency were found to be modified after anti-seizure drug administration. The miniaturized system investigated an absence seizure model, revealing a previously under-characterized biphasic neurovascular response to motor arrest at seizure onset.Blood flow was measured using laser speckle contrast imaging (LSCI), permitting high spatiotemporal resolution flowmetry. While all the imaging modalities employed have a high dynamic range, LSCI-derived image sequences have rapidly varying high spatial frequency distortions. These distortions significantly reduce the reliability of misfocus correction and image registration approaches, which are required for brain-motion insensitive signal amplification. Novel speckle noise insensitive parameters were developed for sub-depth of field active LSCI misfocus correction and high precision LSCI image registration, permitting flowmetry stabilization. An adaptive cardiographic synchronization scheme enabled precise cardiac cycle-driven blood flow trace characterization and greater flowmetry stabilization than previously reported. The LSCI image registration approach exploited high precision vessel edge detection filters which are stable in the presence of a spatial sparsity enforcement scheme that preserves temporal flow dynamics. Consequently, these filters provide a data decompression mechanism that permits the measurement of arteriole diameter changes and blood flow dynamics at/below 1.0±0.5% and 0.10±0.05% data retention, respectively. Concurrent compression of oxygenation and calcium imaging data is feasible for most applications given their lower spatiotemporal contrast.Ongoing research is presented supporting the suitability of photoacoustic imaging for whole-brain myelin mapping, demyelination assessment, and hypoxia-ischemia tracking. Cardiographic synchronization permitted deep cerebral artery visualization with improved artery occlusion sensitivity.The several proof-of-principle innovations presented will enable expanded multimodal imaging studies of disease processes, progression and treatment effects in freely-behaving animals with improved flowmetry stability and data transmission efficiency.

ISBN: 9781085758659Subjects--Topical Terms:

535387
Biomedical engineering.

Multimodal Optical Imaging of Seizure with Flowmetry Stabilization.
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245 1 0 $a Multimodal Optical Imaging of Seizure with Flowmetry Stabilization.
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500 $a Source: Dissertations Abstracts International, Volume: 81-02, Section: B.
500 $a Advisor: Levi, Ofer;Carlen, Peter L.
502 $a Thesis (Ph.D.)--University of Toronto (Canada), 2019.
506 $a This item must not be sold to any third party vendors.
520 $a Two novel multimodal optical imaging systems, both providing concurrent full-field blood flow and oxygenation/volume mapping, were developed to investigate epilepsy-related disease models: 1) An epifluorescence microscope-integrated system, permitting simultaneous intracellular calcium imaging and electrographic recording of brain activity and 2) a miniaturized head-mounted system (collaborative work), permitting brain imaging of freely-behaving rats. The microscope-integrated system investigated microvascular dynamics during seizure, revealing large arteriole dilation associated with seizure onset. Furthermore, the electrographically correlated neurovascular seizure responses, intracellular calcium dynamics, and inter-seizure consistency were found to be modified after anti-seizure drug administration. The miniaturized system investigated an absence seizure model, revealing a previously under-characterized biphasic neurovascular response to motor arrest at seizure onset.Blood flow was measured using laser speckle contrast imaging (LSCI), permitting high spatiotemporal resolution flowmetry. While all the imaging modalities employed have a high dynamic range, LSCI-derived image sequences have rapidly varying high spatial frequency distortions. These distortions significantly reduce the reliability of misfocus correction and image registration approaches, which are required for brain-motion insensitive signal amplification. Novel speckle noise insensitive parameters were developed for sub-depth of field active LSCI misfocus correction and high precision LSCI image registration, permitting flowmetry stabilization. An adaptive cardiographic synchronization scheme enabled precise cardiac cycle-driven blood flow trace characterization and greater flowmetry stabilization than previously reported. The LSCI image registration approach exploited high precision vessel edge detection filters which are stable in the presence of a spatial sparsity enforcement scheme that preserves temporal flow dynamics. Consequently, these filters provide a data decompression mechanism that permits the measurement of arteriole diameter changes and blood flow dynamics at/below 1.0±0.5% and 0.10±0.05% data retention, respectively. Concurrent compression of oxygenation and calcium imaging data is feasible for most applications given their lower spatiotemporal contrast.Ongoing research is presented supporting the suitability of photoacoustic imaging for whole-brain myelin mapping, demyelination assessment, and hypoxia-ischemia tracking. Cardiographic synchronization permitted deep cerebral artery visualization with improved artery occlusion sensitivity.The several proof-of-principle innovations presented will enable expanded multimodal imaging studies of disease processes, progression and treatment effects in freely-behaving animals with improved flowmetry stability and data transmission efficiency.
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