2003 Volume 1 Issue 1 Pages 46-59
The ultrasound reflection technique was introduced into cardiology in 1953, and in 1955, the ultrasonic Doppler technique was introduced. The dawning stage of ultrasound diagnostics of the heart was the ten year period prior to 1965. During this stage, besides the afore mentioned techniques, there were only a few attempts to use ultrasound for heart diagnostics.
In the next age, from about 1965 to 1975, the leading type of the cardiac ultrasound was M-mode echocardiography. M-mode echocardiography was the first generation of ultrasound diagnostics of the heart used in routine practice. This period may be called the age of M-mode echocardiography. During 1975 to 1985, the leading technique was real-time two-dimensional echocardiography, with and without the Doppler mechanism, which was the second generation in routine. This period can be called the age of the two-dimensional echocardiography. The period from 1985 to the present time may be called the age of the color Doppler, which has been the third generation of the cardiac ultrasound. However, since the middle of this last age the cardiac ultrasound has been showing the most diversification of techniques and usages. Therefore, it is uncertain whether the age division as mentioned above can be continued. The period extending over the last age and present time may be the second dawn of the cardiac ultrasound.