Overview
My research is primarily in the area of advanced instrumentation for diagnosis and treatment of electrophysiological problems. This research covers two primary organ systems: the heart and the brain.
One thrust of the cardiac-based work is centered on atrial fibrillation and in particular on very low energy atrial defibrillation strategies. The goal is to produce a device that can defibrillate the atria with a painless series of electrical impulses. A second area of interest is the study of the biophysics of radio frequency ablation of the heart. A third avenue of research in the cardiac area is the development of new instruments and techniques for tracking interventional devices within the body without the use of ionizing radiation. These devices primarily rely on ultrasound technology. There is a strong collaborative effort in this area with the Duke Ultrasound group in the Department of Biomedical Engineering. The long term goal of this work is to develop technology to deliver image-guided therapy to target tissues in the heart and other organs.
In neuroengineering, we are currently developing a "brainchip" that would telemeter information recorded directly from neurons in the brain to a remote device. This IC based technology is being developed for application in neuro-prosthetic or brain controlled devices. There is a close collaboration on this project between our lab and the laboratory of Dr. Miguel Nicolelis the Department of Neurobiology. We are also developing advanced neural recoding systems to use on unrestrained, untethered animals as they learn to perform certain tasks.
Current Appointments & Affiliations
Recent Publications
3-D Ultrasound Imaging Using Helicoid Array Transducers.
Journal Article IEEE transactions on ultrasonics, ferroelectrics, and frequency control · March 2021 Real-time 3-D intracardiac echocardiography (ICE) can enable faster imaging of surfaces orthogonal to the transducer, such as the pulmonary vein (PV) antra and cardiac valve annuli. However, the requirement for a 2-D grid of individually wired elements mak ... Full text CiteMeasuring Intraventricular Pressure Using Ultrasound Elastography.
Journal Article Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine · May 2019 ObjectivesIntraventricular pressure (IVP) is one of the most important measurements for evaluating cardiac function, but this measurement is not currently easily assessable in the clinic. The primary reason for this is the absence of a noninvasive ... Full text CiteAssessment of Diastolic Function Using Ultrasound Elastography.
Journal Article Ultrasound in medicine & biology · March 2018 Shear wave elasticity imaging (SWEI) is a novel ultrasound elastography technique for assessing tissue stiffness. In this study, we investigate the potential of SWEI for providing diastolic functional assessment. In 11 isolated rabbit hearts, pressure-volu ... Full text CiteRecent Grants
Training in Medical Imaging
Inst. Training Prgm or CMEMentor · Awarded by National Institutes of Health · 2003 - 2020Acoustic Radiation Force Impulse (ARFI) Imaging of Cardiac Tissue
ResearchCo Investigator · Awarded by National Institutes of Health · 2009 - 2020Enhanced Design Experiences for Duke BME Students
Inst. Training Prgm or CMECo-Principal Investigator · Awarded by National Institutes of Health · 2011 - 2017View All Grants