New method for evaluating left ventricular wall motion by color-coded tissue Doppler imaging: in vitro and in vivo studies
K Miyatake,
M Yamagishi,
N Tanaka,
M Uematsu,
N Yamazaki,
Y Mine,
A Sano,
and
M Hirama
Cardiology Division of Medicine, National Cardiovascular Center, Osaka, Japan.
OBJECTIVES. The aim of this study was to examine the accuracy and validity of a newly developed tissue Doppler imaging system in in vitro and in vivo studies. BACKGROUND. Because quantitative measurement of wall motion velocity in real time is still difficult by conventional echocardiography, we developed a new system for evaluating ventricular wall motion by analyzing Doppler signals from cardiac tissue. METHODS. We used a modified Doppler color imaging system, omitting the high pass filter to allow Doppler signals from cardiac tissue to enter the auto-correlator. Ultrasound carrier and pulse repetition frequencies were 3.75 MHz and 3.0 to 6.0 kHz, respectively. Under these conditions, the lowest measurable velocity was 0.2 cm/s. RESULTS. In the rotating sponge model, the measured velocity correlated well with the actual velocity (y = 0.97x + 2.17, r = 0.99). In clinical settings, the mid-ejection mean velocity at either endocardial or epicardial sites of the left ventricular posterior wall measured by M-mode tissue Doppler imaging correlated well with that measured by conventional M-mode echocardiography (y = 0.94x + 0.64, r = 0.99). During systole, in healthy subjects, the anterior left ventricular wall was color-coded blue and the posterior wall was color-coded red, whereas the akinetic regions associated with myocardial infarction showed no color throughout the cardiac cycle. The ventricular posterior wall excursion velocity, defined as the difference between velocities at the endocardial and epicardial sites, was significantly slower in patients with dilated cardiomyopathy (0.4 +/- 0.3 cm/s) than in normal subjects (2.0 +/- 0.6 cm/s). CONCLUSIONS. These results indicate that the present system accurately represents tissue velocity and can create two-dimensional color images that facilitate visual assessment of ventricular wall motion.
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Quantitative Assessment of Alterations in Regional Left Ventricular Contractility With Color-Coded Tissue Doppler Echocardiography : Comparison With Sonomicrometry and Pressure-Volume Relations
Circulation,
May 20, 1997;
95(10):
2423 - 2433.
[Abstract]
[Full Text]
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E. K. Louie and D. S. Louie
New Echocardiographic Technology: Does it Add to Clinical Decision-Making?
Seminars in Cardiothoracic and Vascular Anesthesia,
March 1, 1997;
1(1):
16 - 31.
[PDF]
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T. P. Abraham, R. A. Nishimura, D. R. Holmes Jr, M. Belohlavek, and J. B. Seward
Strain Rate Imaging for Assessment of Regional Myocardial Function: Results From a Clinical Model of Septal Ablation
Circulation,
March 26, 2002;
105(12):
1403 - 1406.
[Abstract]
[Full Text]
[PDF]
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