| 摘要 |
PURPOSE:To always permit the detection representation of blood flow and improve the continuity in the blood flow representation by selecting the MTI filter in a blood flow speed calculation part by a means for time setting after R wave trigger and a means for setting the MTI filter used in each region of the above-described time. CONSTITUTION:The ECG signal is inputted into an ECG circuit 18 from an ECG electrode, and the R wave trigger is outputted and sent into an MTI filter dynamic control part 23. An operator sets the time after t1sec. and the time after t2sec. from the R wave from a keyboard 21, and an MTI filter used in each region divided by the set time t1, t2 is set by selecting MTI (B) after t1sec. and MTI(A) after t2sec. from a keyboard 22. Two kinds of MTI filter in a blood flow speed calculation part is selected in each time in the min. one sound line unit according to the setting. Since the MTI filter having the cut-off frequency corresponding to the blood flow speed at each time phase of heart- beat can be set, the time continuity in the blood flow representation can be improved, suppressing the noise such as the wall motion ghost signal. |
