| 摘要 |
The device comprises at least one ultrasound transducer (10) which is connected to a transmitter stage (20) and to a stage (30) for receiving and processing echographic signals returned to the transducer. The latter stage (30) comprises a conventional first processing channel (60) which consists mainly of an amplifier circuit (61), an envelope detection circuit (62), a scan converter (64), and a display device (65), as well as a second processing channel (100), which comprises: (A) an analog-to-digital converter (63) and a first image memory (641) for storing the image during acquisition; (B) a motion detection circuit (130) which controls, or not, for each image point the application of a recursive temporal filtering coefficient alpha ; (C) a conditional recursive temporal filter circuit (150) which supplies, on the output of said second processing channel (100), a treated image R(t, x, y) which forms a sum of the image I(t, x, y) most recently obtained and the preceding treated image R(t-1, x, y), weighted by values relating to said filter coefficient alpha . |
