| 摘要 |
PURPOSE:To lower the sampling frequency of Doppler data without changing ultrasonic repeating frequency and to observe low speed blood flow, by performing the alteration control of ultrasonic scanning order. CONSTITUTION:When scanning is performed from the right end of a probe 11, the scanning order thereof is set to scanning line No.1 scanning line No.m-1 scanning line No.m scanning line No.1 scanning line No.2 scanning line No.n scanning line No.1 scanning line No.2 scanning line No.3 scanning line No.1.... By this method, the repeating frequency of the same direction ultrasonic transmitting beam (the sampling frequency of a Doppler signal) fr can be lowered to 1/3 and data output timing can be set to a definite interval. |
