The displacement values may be employed to produce a signal indicative of {HEAD ~ a respiration phase} that can be used in {TAIL ~ connection} with motion artifact reduction techniques 
The displacement values may be employed to produce a signal indicative of { HEAD ~ a respiration phase } that can be used in { TAIL ~ connection } with motion artifact reduction techniques
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH