METHODS AND APPARATUS FOR THE EXAMINATION OF INTERNAL ORGANS

摘要

Ultrasonic apparatus for visualising the internal organs of the human body using an ultrasonic array probe is characterized by means for digitising the ultrasonic echo signals and means for processing the digitised signals. Data may be sampled from each array element excited separately, or on a group of elements sequentially with a very small time increment between samples. A step (11) for early data processing can include switching the transmit carrier frequency between scans, and compensation for ringing effects in the transducers. A step (12) provides synthetic aperture focusing technique. Step (13) comprises Software Envelope or Transform demodulation, attenuation or time gain correction and data compression.