Each of {HEAD ~ the different methods} in use is sensitive to some particular aspect of {TAIL ~ the structures} to be imaged 
Each of { HEAD ~ the different methods } in use is sensitive to some particular aspect of { TAIL ~ the structures } to be imaged
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH