BACKGROUND: To study the utility of uterine artery Doppler flow velocimetry in 2nd trimester in prediction of preeclampsia in high risk and low risk women. MATERIALS AND METHODS: 200 women carrying <16weeks of pregnancy with singleton fetus and without any fetal anomaly were recruited and were divided in high-risk and low-risk group. Doppler velocimetry of uterine artery was done at 24-26 weeks...

BACKGROUND The transient effects of epidural bupivacaine 0.25-0.5% on the Doppler velocimetry of umbilical and uterine arteries had been reported, but the effects of continuous lower dose epidural bupivacaine (0.05-0.1%) infusion for labour analgesia have never been reported. In this study, we evaluated the effects of continuous epidural bupivacaine 0.075% on the Doppler velocimetry of uterine ...

The widespread application of microfluidic devices in the biological and chemical sciences requires the implementation of complex designs and geometries, which in turn leads to atypical fluid dynamic phenomena. Accordingly, a complete understanding of fluid dynamics in such systems is key in the facile engineering of novel and efficient analytical tools. Herein, we present an accurate approach ...

A VECTOR SCANNING PROCESSING TECHNIQIJE FOR PULSED LASER VELOCIMETRY Mark P. Wernet National Aeronautics and Space Administration Lewis Research Center Cleveland, Ohio 4113.5 and Robert V. Edwards Case Western Reserve University Dept. of Chemical Engineering Cleveland, Ohio 44106 by Pulsed laser sheet velocimetry yields non-intrusive measurements of two-dimensional velocity vectors across an ex...

BACKGROUND We conducted this prospective study to evaluate the prognostic significance of uterine and ovarian artery Doppler velocimetry in clomiphene citrate (CC) cycles. MATERIALS AND METHODS A total of 80 patients with unexplained infertility were given 100 mg/day of CC from day 3 to day 7 of their cycles in this current prospective study. On cycle day 3, before administration of CC, each ...

Laser Doppler velocimetry is a newly available technique for the continuous and non-invasive measurement of capillary perfusion. The technique is presented and preliminary results of its use in the evaluation of amputation levels in 16 patients discussed.

The Aerospace Research Laboratory at the University of Virginia currently uses Particle Image Velocimetry (PIV) to measure the velocity fields of flow through a Mach 2 Scramjet Test Section. PIV is the method of tracking seed particles as they are carried through the flow, and using their velocities to create a velocity field. This method is limited by seed particles coating the windows, known ...

A particle-shadow-velocimetry (PSV) technique that employs light sources with significantly lower power than lasers is introduced as a variant of particle-image velocimetry (PIV). The PSV technique uses a non-scattering approach that relies on direct in-line illumination by a pulsed source such as a light-emitting diode (LED) onto the camera imaging system. Narrow-depth-of-field optical setups ...

An improved correlation based Particle Tracking Velocimetry (PTV) algorithm was proposed in the present paper. The path tracking of the tracer particles was achieved through a correlation operation of the small interrogation window around the studied tracer particles at two-time steps. The central positions of the tracer particles were determined by the correlation operation of the tracer parti...

In this article, we present an experimental setup and data processing schemes for 3D scanning particle tracking velocimetry (SPTV), which expands on the classical 3D particle tracking velocimetry (PTV) through changes in the illumination, image acquisition and analysis. 3D PTV is a flexible flow measurement technique based on the processing of stereoscopic images of flow tracer particles. The t...