Ultrasonic transducer array element apparent prepositioning - feeds signals, received by active aperture of transducer array, to several delay units

摘要

The correction uses an adaptive aerial for compensating heavy interruption of the sound beam by displacement of a tranducer array nearer to the interference point. The apparent displacement (retroprojection) of the transducer elements (W1,2...) is used for the supply of signals (S1,2) to a number of delay units (31,32) after resection from an active aperture of the ultrasonic transducer array (8). The number of the delay units corresponds to the number of the apparently displaced transducer elements. The delay times of the units are so chosen that the output signal (21,22) of each delay unit focusses the active aperture to each location of the apparent displaced transducer element. The obtained output signals may be electronically focussed. USE/ADVATAGE - For examination of intestinal tissues, with improved correction of image interferences.