Analysis of Ventricular Wall Motion Using Color-Coded Tissue Doppler Imaging System

Abstract

We developed a new color Doppler system by which Doppler signals associated with tissue motion can be determined, and called it the tissue Doppler imaging (TDI) system. Using high-speed scanning, the frame rate was 26–38 F/s, and the pulse repetition frequency was 4.5–6.0 kHz. Under these conditions, the lowest measurable velocity was improved to 2 mm/s. Wall motion toward the transducer was coded as red, and that away from the transducer, as blue. To examine the accuracy and validity of the measured velocity of ventricular wall motion, we performed in vitro and in vivo studies. The results demonstrate that the present TDI system accurately represents the tissue velocity, and is applicable for creating two-dimensional images of the ventricular wall motion in real time, facilitating the visual assessment of abnormal ventricular wall motion.

The Role of Tissue Doppler Imaging as a New Diagnostic Option in Evaluating Left Ventricular Function

“…In this procedure, the tissue motion velocity is recorded by detecting the Doppler shift associated with posterior dispersion of ultrasound from myocardial tissue. TDI can be subdivided into color-coded TDI [11][12][13][14] and pulsed TDI [15][16][17]. Myocardial velocity, determined using these methods, was compared to wall motion recorded by conventional M-mode echocardiography, and its accuracy and clinical usefulness were demonstrated.…”

Effect of Cilnidipine on Left Ventricular Diastolic Function in Hypertensive Patients as Assessed by Pulsed Doppler Echocardiography and Pulsed Tissue Doppler Imaging

“…First, we measured the motion velocity only at the endocardial portion of the LV wall and, therefore, could not calculate the transmyocardial velocity gradient. 16,17 Consequently, disease-associated influences on the motion of the whole heart cannot be ruled out. 17 However, motion velocity at the endocardial or mid-wall portion is generally higher than that at the epicardial portion.…”

“…This new technique is expected to provide valuable information on LV wall motion abnormalities in patients with heart disease. [15][16][17] Cilnidipine is a novel and unique 1,4-dihydropyridine derivative calcium antagonist that has a hypotensive action of slow-onset and prolonged duration, and has potent inhibitory action on L-and N-type voltage-dependent calcium channels. Clinical usefulness of this calcium antagonist is expected as a result from its heart-protecting action in addition to its antihypertensive effect.…”

Evaluation of the Hemodynamic Relationship Between the Left Atrium and Left Ventricle During Atrial Systole by Pulsed Tissue Doppler Imaging in Patients With Left Heart Failure

“…The 53 patients included 30 patients with dilated cardiomyopathy (mean age: 52±18 years, range: 28-79 years), 16 patients with ischemic cardiomyopathy 21 (mean age: 59±11 years, range: 45-79 years), and 7 patients with cardiac amyloidosis (mean age: 56±17 years, range: 34-77 years). Twenty patients, who had been admitted with the chief complaints of chest pain, palpitations, dyspnea or heart murmur, were included as controls.…”