| 摘要 |
PURPOSE:To provide an ultrasonic diagnostic device capable of obtaining a blood flow image easy to see by providing the device with an attenuation control means controlling the attenuation coefficient of an attenuation means so that the output blood flow data value of the attenuation means is attenuated linearly by unit time. CONSTITUTION:A persistence circuit consists of a read only memory (ROM) 21 being an attenuation coefficient control means, multiplier 22 being an attenuation means, peak-and-hold memory 23 being a data holding means, comparator 24 being a comparison switching means, and switching device 25. In the ROM 21, the attenuation coefficient values where the difference between the frame rate or peck value, and the latest blood flow data is small or large and large or smaall are stored for the address data. Thus, the output peak value of the peak-and-hold memory 23 is attenuated linearly for time (t). The persistence is kept constant and the blood flow image is made easy to see. |
