| 摘要 |
PURPOSE: To allow reliable discrimination of Doppler signal information from noise relating to ultrasonic diagnostic system for measuring the velocity of the blood stream by using spectral Doppler ultrasonography technique, automatically analyzing Doppler spectral data of the velocity of the bloodstream and improving the display method. CONSTITUTION: By transmitting repeatedly ultrasonic Doppler waves in selective positions within a living body such as heart or a blood vessel, Doppler information during a period of time of scattering sampling is displayed, scrolling as a continuous series of a spectral line in a real time against velocity display. In this display, the maximum velocity during the systolic time of the cardiac cycle is displayed by lines 10, 20 and 30 and the velocity during the diastole of the cardiac function is displayed by the intervals 12, 22 and 32 during the systolic time. Further, individual instantaneous measured values of Doppler spectral information are compared with a noise threshold and the determined peak value and means velocity are displayed by lines 60 and 62 utilizing contrasting colors or shading. |
