| 摘要 |
A Doppler ultrasound diagnostic apparatus equipped with Doppler detection units and a forward/reverse separating means in an audio signal output system, a complex Doppler signal control means which stores a complex Doppler signal received during the Doppler-mode period and reads out said complex Doppler signal during the B-mode period to use as a complex Doppler signal during the B-mode period, wherein said complex Doppler signal control means includes storage means for storing complex Doppler signals that are received during the Doppler-mode period; control means for reading out complex Doppler signals stored in said storage means in a reverse order during the B-mode period; complex frequency inversion means for inverting the frequency of the complex Doppler signals read by said control means in the reverse order from said storage means; and phase rotation correction means for correcting a difference in phase at a moment when the Doppler mode is connected to the B-mode for a complex Doppler signal from said complex frequency inversion means. This decreases deterioration in the quality of a Doppler sound. |
