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