Michael Ting

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Signal processing for magnetic resonance force microscopy by<lb>Michael Y. J. Ting Chair: Alfred O. Hero III Magnetic resonance force microscopy (MRFM) is an emergent technology that has<lb>the potential for three-dimensional, non-destructive, and in-situ imaging of biological<lb>molecules with atomic resolution. Experiments at IBM have shown that MRFM(More)
The application that motivates this paper is molecular imaging at the atomic level. When discretized at subatomic distances, the volume is inherently sparse. Noiseless measurements from an imaging technology can be modeled by convolution of the image with the system point spread function (psf). Such is the case with magnetic resonance force microscopy(More)
Sparse image reconstruction is of interest in the fields of radioastronomy and molecular imaging. The observation is assumed to be a linear transformation of the image, and corrupted by additive white Gaussian noise. We study the usage of sparse priors in the empirical Bayes framework: it permits the selection of the hyperparameters of the prior in a(More)
Detection of a finite-state Markov signal in additive white Gaussian noise (AWGN) can be done in an intuitive manner by applying an appropriate filter and using an energy detector. One might not expect this heuristic approach to signal detection to be optimal. However, in this paper, we show that for a certain type of finite-state Markov signal, namely, the(More)
BACKGROUND Pulmonary vein (PV) -encircling radiofrequency ablation frequently is effective in vagal atrial fibrillation (AF), and there is evidence that PVs may be particularly prone to cholinergically induced arrhythmia mechanisms. However, PV ablation procedures also can affect intracardiac autonomic ganglia. The present study examined the relative role(More)
OBJECTIVES The aim of this study was to determine the effects of circumferential pulmonary vein ablation (CPVA) and electrogram-guided ablation (EGA) on the spectral characteristics of atrial fibrillation (AF) and the relationship between changes in dominant frequency (DF) and clinical outcome. BACKGROUND Circumferential pulmonary vein ablation and EGA(More)
BACKGROUND Pace mapping has been used to identify the site of origin of focal ventricular arrhythmias. The spatial resolution of pace mapping has not been adequately quantified using currently available three-dimensional mapping systems. OBJECTIVE The purpose of this study was to determine the spatial resolution of pace mapping in patients with idiopathic(More)
Meeting a greenhouse gas (GHG) reduction target of 80% below 1990 levels in the year 2050 requires detailed long-term planning due to complexity, inertia, and path dependency in the energy system. A detailed investigation of supply and demand alternatives is conducted to assess requirements for future California energy systems that can meet the 2050 GHG(More)
RESOURCE CONSTRAINED ADAPTIVE SENSING by<lb>Raghuram Rangarajan Chairperson: Alfred O. Hero III Many signal processing methods in applications such as radar imaging, communi-<lb>cation systems, and wireless sensor networks can be presented in an adaptive sensing<lb>context. The goal in adaptive sensing is to control the acquisition of data measure-<lb>ments(More)