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This is the first book to present an overview of the exciting new
cardiac imaging technique of tissue Doppler echocardiography (TDE).
In order to understand the background of this technique, it is
necessary to compare the physical properties of blood, which
reflects ultrasound poorly but moves with high velocity (up to 150
cm/s) with those of the myocar dium, which reflects ultrasound
strongly but moves with low velocity (less than 10 cm/s). In tissue
Doppler imaging, existing Doppler technology has been modified to
bypass the high-pass filter and enhance calculation of low
velocities, thus enabling selective visualization of the myocardium
rather than of the blood. Because the color Doppler tissue images
are super imposed on the conventional two-dimensional ultrasound
images, this technique is known as TDE. Following a brief
introduction, the history of ultrasound and Doppler imaging is
presented. It is now about 150 years since the death of Christian
Doppler, who described the "Doppler" effect, and more than 100
years since Pierre Curie discovered the piezoelectric effects of
crystals. TDE was developed by Nobuo Yamazaki and Yoshitaka Mine at
the Medi cal Engineering Laboratory, Toshiba Corporation, Tochigi,
Japan. En gineers involved in the development of the technique have
provided important technical information, which the reader will
find an invaluable background to potential applications ofTDE."
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