The flexible probe has a coaxial cable design that includes {HEAD ~ a piezoelectric element} at {TAIL ~ a proximal end} of the probe 
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The flexible probe has a coaxial cable design that includes { HEAD ~ a piezoelectric element } at { TAIL ~ a proximal end } of the probe
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH