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