| 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 transducer 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 averaging.</p> |
