contacting {HEAD ~ a tip} of a biopsy instrument to the membrane so that the tip is displayed in {TAIL ~ the ultrasound image} 
contacting { HEAD ~ a tip } of a biopsy instrument to the membrane so that the tip is displayed in { TAIL ~ the ultrasound image }
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL