| 摘要 |
<p>A hand held ultrasonic instrument (87) is provided in a portable unit which performs both B mode and Doppler imaging. The instrument includes a transduc er array (10) mounted in a hand-held enclosure, with an integrated circuit transceiver connected to the elements of the array (10) for the reception of echo signals. A digital signal processing circuit (40) performs both B mode, and Doppler estimation, as well as advanced functions such as assembly of multiple zone focused scan lines, synthetic aperture formation, depth dependent filtering, speckle reduction, flash suppression, and frame averagi ng.</p> |
