Notches are cut out in the ultrasonic transducer material to divide it into {HEAD ~ a plurality} of {TAIL ~ transducer elements} arranged in the array direction and a direction perpendicular to the array direction 
of
Notches are cut out in the ultrasonic transducer material to divide it into { HEAD ~ a plurality } of { TAIL ~ transducer elements } arranged in the array direction and a direction perpendicular to the array direction
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH