In this thesis, we describe an approach for measuring fluid flows by means of particle tracking velocimetry with a stereo camera system. Building upon an existing hardware setup, originally used for 2D velocimetry, we developed a new system for depth recovery and interactive visualization of particle trajectories, in cooperation with our industry partner Airbus Deutschland GmbH. The application...

Light has been used to noninvasively alter the excitability of both neural and cardiac tissue 1-10. Recently, pulsed laser light has been shown to be capable of eliciting action potentials in peripheral nerves and in cultured cardiomyocytes 7-10. Here, we demonstrate for the first time optical pacing (OP) of an intact heart in vivo. Pulsed 1.875 μm infrared laser light was employed to lock the ...

BACKGROUND Disseminated coccidiomycosis during pregnancy can lead to both maternal and neonatal mortality. Placentitis is an uncommon sequelae and its effect on placental function remains speculative. The present report describes our management of such a case and describes serial umbilical artery velocimetry of an affected placenta. CASE A pregnant woman with coccidioidal placentitis confirme...

The recent explosive increase in the use of  uidic microelectromechanical systems (MEMS) has subsequently driven the development of  uidic measurement techniques capable of measuring velocities at length scales small enough to be of use in characterizing and optimizing these new devices. Recently, several techniques have demonstrated spatial resolutions smaller than 1001mbut larger than 101m....

Flow dynamics in intracranial aneurysms and their adjacent parent vessels play important roles in the development and rupture of intracranial aneurysms. Combined with tagged MR imaging and the use of particle image velocimetry software, tagged MR image velocimetry reveals flow vectors, vorticity, and shear strains at each location in the aneurysm replica every 9 milliseconds. This technique is ...

Purpose: To evaluate the effects of enoxaparin and unfractionated heparin (UFH) administered in prophylactic and therapeutic doses on fetal vessels in healthy pregnant Wistar rats, according to Doppler velocimetry measurements. Methods: Fifty animals were assigned to one of five groups: controls (saline), prophylactic and therapeutic enoxaparin (1 and 2 mg/kg/day, respectively), and prophyl...

The authors implied that the abnormal uterine artery Doppler velocimetry is one of the risk markers for preeclampsia in the second or third trimester and that its abnormality is practically defined at 22–24 weeks as bilateral notching with mean resistance index (RI) > 0.55 (i.e., > 50th centile), unilateral notching with mean RI > 0.65 (> 90th centile), or no notching with mean RI > 0.70 (> 95t...

Robert C Groom, Aaron G Hill The Virginia Heart Center at Fairfax Hospital, Falls Church, Virginia, Barry Kuban The Ohio State University Department of Biomedical Engineering, Columbus, Ohio, William Oneill 3M Cardiovascular, Incorporated, Ann Arbor, Michigan, Bechara F Akl, Alan M Speir, James Koningsberg, Gregory T Sprissler, Mohamed Shakoor, Paul S Massimiano, Nelson A Burton, Robert A Albus...

Particle image velocimetry and a 3D hard sphere discrete particle model were applied to determine particle velocity profiles in the plane around a spout in a spoutfluid bed for various initial bed heights, spout and background fluidization velocities. Comparison between experimental and numerical results revealed that the particle velocities are underestimated by particle image velocimetry, whi...