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