Two techniques have been used to assess myocardial function: pulsed-TDE and color-coded TDE, which is an extension of the pulsed-Doppler technique. Tissue Doppler ultrasonography utilizes modifications of blood flow Doppler technology and calculates velocity from frequency shifts in received ultrasound data in a similar manner.

Jan 13, 2003 · In 22 cases the cardiac structures were recorded in color TDE in a lateral view, in 11 in an apical view and in 17 cases in both lateral and apical views. Best detectable were the walls of the right and left ventricles, the interventricular septum and …

Color TDE is similar to conventional color Doppler and superimposes color-coded tissue velocities onto 2-dimensional (2D) images. This gives better spatial resolution than pulsed-wave TDE but has poorer temporal resolution.

Tissue Doppler echocardiography (TDE) is a relatively recent addition to the diagnostic ultrasonographic examination. This is similar to routine Doppler ultrasonography to assess blood flow, but technologic features focus on lower velocity frequency shifts.

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Myocardial velocities in healthy subjects determined by both pulsed-wave TDE and color TDE were significantly different among the three TDE systems. Myocardial velocities by pulsed-wave TDE in V3 were 2-12% lower (P < 0.05) than those by V2 and 5 …

Aug 12, 2004 · TDE is a by-product of color flow mapping (CFM) technology. In CFM, tissue signals are suppressed and flow signals are analyzed. The reverse is true in TDE. Doppler velocities associated with tissue motion are slower than blood flow. Flow signals are eliminated on the basis of signal amplitude.

Jan 1, 2002 · TDE color M-mode analysis for data obtained at 3 inotropic conditions (esmolol, baseline, dobutamine) in representative study. Left, Filtered TDE images, with 2 sample depth locations at base of septum separated by 1 cm (white and yellow lines). ECG signal is displayed on each image for reference.

Jan 1, 2002 · Myocardial fiber strain is directly related to left ventricular (LV) contractility. Strain rate can be estimated as the spatial derivative of velocities (dV/ds) obtained by tissue Doppler...

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