Velocity vector imaging by use of Linear-Period-Modulated signal.

Echocardiographic Assessment of Left Ventricle Torsion by Tissue Doppler and Velocity Vector Imaging

Introduction Left ventricular (LV) twist is believed to store potential energy and plays an important role in generating diastolic suction. Recent advances in echocardiography techniques have allowed quantification of LV twist. The aim of the present study was to compare LV twist and torsion in healthy human subjects determined by velocity vector imaging (VVI) and tissue Doppler imaging (TDI) a...

Period Estimation of the Modulated Signal

− In the paper, the two non-parametric algorithms for the period estimation are compared: the autocorrelation approach and the interpolated discrete Fourier transform (IDFT) approach both added with algorithm for searching of the lowest common frequency component or the largest period of the modulated signal. The direct approach by IDFT shows better results at two and more cycles of the investi...

echocardiographic assessment of left ventricle torsion by tissue doppler and velocity vector imaging

introduction left ventricular (lv) twist is believed to store potential energy and plays an important role in generating diastolic suction. recent advances in echocardiography techniques have allowed quantification of lv twist. the aim of the present study was to compare lv twist and torsion in healthy human subjects determined by velocity vector imaging (vvi) and tissue doppler imaging (tdi) a...

Global Stabilization of a Linear Plant by Means of a Pulse-frequency Modulated Signal

A system consisting of an unstable linear plant and of a pulse-frequency modulator, as a controller, is considered. Algebraic inequalities, which guarantee the boundedness of all the solutions, are obtained. Copyright c © 2001 IFAC

Ultrasonic Distance and Velocity Measure- Ment Using a Pair of Linear-period-modulated Signals Coding by Maximum Length Sequences for Autonomous Mobile Robots