{HEAD ~ NMR data} indicative of {TAIL ~ the motion} of the anterior abdominal wall of a subject is acquired just prior to each image data pulse sequence in an NMR scan 
indicative of
{ HEAD ~ NMR data } indicative of { TAIL ~ the motion } of the anterior abdominal wall of a subject is acquired just prior to each image data pulse sequence in an NMR scan
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH