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