Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 60 for “"blood oxygen"”.
-
Full Brain Blood-Oxygen-Level-Dependent Signal Parameter Estimation Using Particle Filters
… approach are more than sufficient to predict the Blood-Oxygen-Level-Dependent signal response, more model constraints are needed to uniquely identify a single set of parameters. This illposed nature explains the large discrepancies found in other research that attempted to characterize the model …
-
Blood-Oxygen-Level-Dependent Parameter Identification using Multimodal Neuroimaging and Particle Filters
The Blood Oxygen Level Dependent (BOLD) signal provides indirect estimates of neural activity. The parameters of this BOLD signal can give information about the pathophysiological state of the brain. Most of the models for the BOLD signal are overparameterized which makes the unique identification …
-
The development of a continuous blood oxygen saturation measuring and control system
… which continuously monitors and controls the blood oxygen saturation at the outlet of a membrane-type oxygenator. A reflection oximeter was developed which employs the ratio of the incident light intensity at two wavelengths to obtain the continuous blood oxygen saturation measurement. The …
-
Vascular Reactivity by Blood Oxygen Level Dependent Functional MRI in Cerebral Amyloid Angiopathy: Comparison with Alzheimer's Disease and Assessment of Longitudinal Change
… of Abeta (Aβ) peptides in the brains small blood vessels leading to hemorrhagic stroke and cognitive impairment. Aβ is toxic to smooth muscle cells and impairs blood flow regulation. Reduced blood oxygen level dependent (BOLD) signal amplitude in response to a visual fMRI task has recently …
-
Renal Blood Oxygen Level Dependent (BOLD) Magnetic Resonance Imaging with an Acute Furosemide Stimulus as a Tool to Evaluate Kidney Physiology in Patients Suspected of Renal Artery Stenosis
… novel magnetic resonance imaging techniques. Blood Oxygen Level Dependent (BOLD) magnetic resonance imaging has recently been utilized as a noninvasive tool to detect kidney oxygenation in a number of renal pathologic states. Specifically, it has been evaluated as a potential prognostic tool …
-
Wearable Pulse Oximetry in Construction Environments
… the feasibility of non-invasively monitoring the blood gases of construction workers for carbon monoxide exposure via pulse oximetry. In particular, this study sought to understand the impact of motion artifacts caused by the worker's activities and to determine if those activities would prevent …
-
Analysis of the Effects of Hypoxia on Cognitive Processing Ability
… repeated measures analysis with five levels of oxygen saturation used the <a href="http://search.proquest.com.ezproxy.libproxy.db.erau.edu/pqdtglobal/docview/1499890509/abstract/F026CBBBA0574DDEPQ/1?accountid=27203#">Embry Riddle Aeronautical University</a> Normobaric High Altitude Lab (HAL) to …
-
New MRI Techniques for Nanoparticle Based Functional and Molecular Imaging
… and as a functional platform for non-invasive oxygen tension sensing. Direct readout and quantification of PFC NP can be achieved with fluorine: 19F) MRI because of the unique 19F signal emanating from the core PFC molecules. However, the signal is usually limited by the modest accumulated …
-
Oxygen Polarography in the Awake Macaque: Bridging BOLD fMRI and Electrophysiology
<p>Blood oxygen level dependent (BOLD) fMRI is the predominant method for evaluating human brain activity. This technique identifies brain activity by measuring blood oxygen changes associated with neural activity. Although clearly related, the nature of the relationship between BOLD fMRI …
-
Improving Segmentation and Registration of the Placenta in BOLD MRI
Blood Oxygen Level Dependent (BOLD) MRI images are used to study placental oxygen transport. To analyze the time series dataset of BOLD MRI images of the whole uterus for placental function, we need to segment the placenta in the images and register the images to a common template. In the following …
-
Non-invasive estimation of skin chromophores using Hyperspectral Imaging
… exhibits distinctive variations in melanin and blood concentration values in the form of skin lesions. The current approach for evaluating skin cancer lesions involves visual inspection with a dermatoscope, typically followed by biopsy and histopathological analysis. However, this process, to …
-
Non-invasive Estimation of Skin Chromophores Using Hyperspectral Imaging
… exhibits distinctive variations in melanin and blood concentration values in the form of skin lesions. The current approach for evaluating skin cancer lesions involves visual inspection with a dermatoscope, typically followed by biopsy and histopathological analysis. However, to decrease the …
-
Factors limiting the exercise tolerance of patients with end-stage renal failure undergoing maintenance haemodialysis
Exercise tolerance, measured as peak oxygen consumption (VO₂ peak), is very low in patients with end-stage renal failure undergoing maintenance haemodialysis. Due to their associated anaemia and low peak heart rates during maximal exercise it has been argued that the reduced blood oxygen carrying …
-
Investigation of splanchnic perfusion utilising an intraluminal opto-electronic sensor placed in the duodenum
… response is activated, it exhibits regulation of blood flow and extraction of oxygen, facilitating redistribution of blood to vital organs. This can ultimately lead to systemic inflammatory response and multiple organ failure. The vital need to monitor the perfusion of the splanchnic region in …
-
Agnostic Testing Kiosk for Remote Vitals Sensing
… heart rate, respiratory rate, body temperature, blood oxygen saturation, motion performance, ambient temperature and relative humidity, and position, with options to add more sensors. This system will act as a plug-and-play prototyping system for current and future projects of any remote vitals …
-
An analog VLSI front end for pulse oximetry
… and continuous method for monitoring the oxygen saturation of a patient's blood. In modem medical practice, blood oxygen level is considered one of the important vital signs of the body. The pulse oximeter system consists of an optoelectronic sensor that is normally placed on the subject's …
-
Improving the Accessibility of Smartwatches as Research Tools by Developing a Software Library
… is being utilized to track heart rate, blood-oxygen levels, activity and movement, and sleep. However, the current state of the art lacks a uniform method to extract, organize, and analyze data collected from these devices. The objective of this research was to develop a Python software …
-
Correlation and real time classification of physiological streams for critical care monitoring.
… significant relative changes in heart rate, blood oxygen saturation levels and pauses in breathing in the respiratory impedance signal. The accuracy of the algorithm for detecting these is 97.8%, 98.3% and 98.9% respectively. The accuracy for correlating the streams and determining spells …
-
The Behavioral and Neural Mechanisms of Social and Non-social Risky Decision-Making
… an adaptation of the Trust Game while their blood-oxygen-level-dependent response was monitored using functional magnetic resonance imaging. Differences in risk preferences across social and non-social conditions as well as neuroimaging correlates of social and non-social risk will be …
-
Investigation of fontanelle photoplethysmographs and oxygen saturations in intensive care neonates and infants utilising miniature photometric sensors
… babies on intensive care, information regarding blood oxygen saturation (SpO2) is determined non-invasively by a device called a pulse oximeter. Sensors are usually placed on a hand or foot where their operation relies on the presence of pulsatile arterial blood. Light shines at two or more …
Page 1 of 3