Methods A total of 43 consecutive patients (age 44 10 years) with moderate to severe PVS referred to Royal Brompton Hospital from 2002 to 2005 were retrospectively studied. Patient New York Heart Association (NYHA) functional class was recorded. The RV (lateral tricuspid annulus motion) long-axis movement was measured by M-mode and pulsed-wave (PW) tissue Doppler imaging (TDI). Restrictive RV p...

Pulsed Coherent Doppler Lidar (CDL) system is so good as to prove the feasibility of the marine atmosphere boundary layer detection. A ship-mounted Coherent Doppler lidar was used to measure the wind profile and vertical velocity in the boundary layer over the Yellow sea in 2014. Furthermore, for the purpose of reducing the impact of vibration during movement and correcting the LOS velocity, th...

The width of the jet flow in the pulmonary artery was measured using a multigate pulsed Doppler system in a baby with severe pulmonary valve stenosis. The degree of stenosis estimated before operation agreed with the result obtained during surgery.

Pulsed wave Doppler ultrasound has been used for estimation of blood velocity in human body as an implicit result of being non-invasive method. In this research, to compensate the drawbacks such as long observation window of prevalent methods in the Doppler ultrasound, we proposed a new adaptive method based on projection of the cross spectral metric technique into the amplitude and phase estim...

Various methods of Doppler echocardiography are useful in the analysis of flow dynamics within the heart and the pulmonary circulation in patients with COPD. In addition, to distinguish patients with increased pulmonary artery pressures from those with normal pressures, Doppler techniques provide quantitative methods for estimating pulmonary artery pressures non-invasively. Doppler echocardiogr...

Colour Doppler imaging (CDI) is a recent development in ultrasonography. It allows simultaneous two-dimensional structural imaging and Doppler evaluation of blood flow. Quantitative information on flow velocity is obtained by pulsed Doppler spectral analysis, the colour information being used to choose the vessel of interest. Using this technique the authors examined a patient with an orbital v...

A case of right coronary to left ventricular fistula was diagnosed by cross sectional and Doppler echocardiography. The origin and site of entry into the left ventricle of the enlarged right coronary artery were shown by cross sectional echocardiography. Diastolic flow was detected in the left ventricle by both pulsed and continuous Doppler echocardiography. The fistula was confirmed by cardiac...

A Doppler filter bank (DFB) is the heart of pulsed Doppler radar and gives clutter filtering and coherent integration. With these capabilities, it provides the improvement of detection probability as well as velocity discrimination, which can detect small targets in clutter environment. This paper implements a DFB with parallel processing configuration using multiple digital signal processors (...

This paper describes the design and construction of two ultrasonic Doppler transducers using Finite Element Analysis for blood flow measurement. These transducers were constructed using as sensing element, commercial 8 MHz PIC255 piezoceramic discs, EPO-TEK 301 and Rexolite 4422 as backing and matching layer materials respectively. The objective of this work was to design and construct two sing...

the turkmen horse is one of the oldest and purest breeds in the world. there is no information with regards to the normal echocardiographic parameters of this horse regarding to cardiac diseases. pulsed-wave (pw) doppler echocardiography was performed on 42 clinically normal 3- to 15-year-old racing turkmen horses. there were 26 stallions and 16 mares. the left ventricular isovolumetric contrac...