Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Keyword
-
- EEG (2)
- ALS (1)
- Arrhythmias (1)
- Assistive devices (1)
- Atrial fibrillation (1)
-
- Augmentative communication (1)
- BCI (1)
- Biomedical (1)
- Brain (1)
- Brain-computer interface (BCI) (1)
- Cardiac electrophysiology (1)
- Defibrillation (1)
- Electric fields distribution (1)
- Filament dynamics (1)
- Myocardial infarction (1)
- Nanosecond pulse (1)
- Optical mapping (1)
- RF ablation (1)
- Schizophrenia (1)
- Visual Evoked Potential (VEP) (1)
Articles 1 - 4 of 4
Full-Text Articles in Engineering
New Engineering Approaches To Arrhythmias And Myocardial Infarction, Frency Varghese
New Engineering Approaches To Arrhythmias And Myocardial Infarction, Frency Varghese
Biomedical Engineering Theses & Dissertations
In this thesis, we present new engineering approaches to several important cardiac diseases. Chapter 1 considers the dynamics of arrhythmias. The most dangerous arrhythmias are reentrant arrhythmias, including ventricular fibrillation and ventricular tachycardia. During these arrhythmias, there are one or several rotating excitation waves present in the heart. Because of their shape, these waves are called scroll waves; their center of rotation is a one-dimensional curve called the filament. Filaments largely constrain the configuration of a scroll wave but are much simpler, so much effort has gone into describing scroll wave dynamics in terms of the dynamics of their filaments. …
Ablation Of Cardiac Tissue With Nanosecond Pulsed Electric Fields: Experiments And Numerical Simulations, Fei Xie
Biomedical Engineering Theses & Dissertations
Cardiac ablation for the treatment of cardiac arrhythmia is usually performed by heating tissue with radio-frequency (RF) electrical currents to create conduction-blocking lesions in order to stop the propagation of electrical waves. Problems associated with RF ablation are recurrence of arrhythmias after successful treatments, tissue loss beyond the targeted tissue, long duration of the ablation procedure, and thermal side effects including thrombus formation that may lead to stroke. Here, we propose a new, non-thermal ablation method using nanosecond pulsed electric fields (nsPEFs) with better-controlled ablation volume, shorter procedure time, and no thermal side effects. We demonstrate that we can create …
Development Of A Practical Visual-Evoked Potential-Based Brain-Computer Interface, Nicholas R. Waytowich
Development Of A Practical Visual-Evoked Potential-Based Brain-Computer Interface, Nicholas R. Waytowich
Biomedical Engineering Theses & Dissertations
There are many different neuromuscular disorders that disrupt the normal communication pathways between the brain and the rest of the body. These diseases often leave patients in a `locked-in" state, rendering them unable to communicate with their environment despite having cognitively normal brain function. Brain-computer interfaces (BCIs) are augmentative communication devices that establish a direct link between the brain and a computer. Visual evoked potential (VEP)- based BCIs, which are dependent upon the use of salient visual stimuli, are amongst the fastest BCIs available and provide the highest communication rates compared to other BCI modalities. However. the majority of research …
Multichannel Characterization Of Brain Activity In Neurological Impairments, Yalda Shahriari
Multichannel Characterization Of Brain Activity In Neurological Impairments, Yalda Shahriari
Biomedical Engineering Theses & Dissertations
Hundreds of millions of people worldwide suffer from various neurological and psychiatric disorders. A better understanding of the underlying neurophysiology and mechanisms for these disorders can lead to improved diagnostic techniques and treatments. The objective of this dissertation is to create a novel characterization of multichannel EEG activity for selected neurological and psychiatric disorders based on available datasets. Specifically, this work provides spatial, spectral, and temporal characterizations of brain activity differences between patients/animal models and healthy controls, with focus on modern techniques that quantify cortical connectivity, which is widely believed to be abnormal in such disorders. Exploring the functional brain …