We gladly welcome 4 additional Ph.D. students into our group to work on exciting and intriguing fluid mechanics problems. Welcome Luis Sanjuan, Rudra Sethi, Ruhi Sharmin and Shailee Mitra. ...
We had a wonderful lab outing with great food and company to celebrate various achievements of the lab including the graduation of Lalit, Sreyashi and Brett. Sreyashi with her graduation card ...
B-mode Speckle Tracking Echocardiography (STE) estimates the change in myocardial tissue length during a heartbeat. Commercial STE software use block-matching to track local speckle patterns and advect hand-drawn boundaries through these tracks to estimate length change. Strain is gaining adoption as a clinical metric for...
Echocardiogram Particle Image Velocimetry (echoPIV) is an emerging method for cardiac flow visualization. EchoPIV tracks acoustic-opaque bubbles introduced into the blood stream using block-matching methods. Despite increased interest, echoPIV is not routinely performed, as contrast enhancement is not clinically indicated unless initial image quality is...
Visualization and quantitation of multi-directional cardiovascular flow without the need for sedation or contrast is desirable across all practices of cardiology. Intraventricular flow mapping (iVFM) is one such method for multi-direction visualization. iVFM estimates the transverse flow from color Doppler ultrasound using the continuity equation....
The uncertainty in a planar PIV measurement has been a topic of great interest in the last decade. Here, we present a new direct uncertainty estimation method for Particle Image Velocimetry (PIV), that uses the correlation plane as a model for the probability density function...
Volumetric Particle Tracking Velocimetry (PTV) non-invasively measures the 3D velocity field by recording successive snapshots of the tracer particle motion using a multi-camera set-up. A key step in the measurement chain is reconstructing the 3D particle location using the multi-camera projected particle images. However, the...
Pressure measured from the cardiovascular system is widely used to diagnose disease. Pressure reconstruction methods are increasingly of interest with the development of 4D flow magnetic resonance imaging (MRI) which noninvasively measures time-resolved velocity fields in-vivo. However, several error sources and limitations inherent to in...
Estimating the probability density function (PDF) of the random motion of particles has many applications. For example, measuring diffusion, rheology, temperature, Reynolds stresses in turbulent flows, and uncertainty in velocity measurements. Current methods based on cross-correlation (CC) of image ensembles estimate an assumed Gaussian PDF's...
Autoinjectors are drug delivery medical devices for self-administered injection of biopharmaceuticals. Even though the working principle of single-spring-actuated autoinjectors is similar, differences in device design can affect the functionality and performance. From an engineering point of view, this study investigates the performance differences of two...