For carring out the measuring, {HEAD ~ a transmitting fiber optic} and a receiving fiber optic in the endoscope are guided separately to respective separate optic modules at the front end of {TAIL ~ the endoscope} 
For carring out the measuring , { HEAD ~ a transmitting fiber optic } and a receiving fiber optic in the endoscope are guided separately to respective separate optic modules at the front end of { TAIL ~ the endoscope }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL