separate voltmeter means connected to each electrode for measuring individual voltages at each electrode with respect to the common ground due to the multiplicity of concurrent patterns for use in imaging {HEAD ~ at least part} of {TAIL ~ the volume} of the body 
separate voltmeter means connected to each electrode for measuring individual voltages at each electrode with respect to the common ground due to the multiplicity of concurrent patterns for use in imaging { HEAD ~ at least part } of { TAIL ~ the volume } of the body
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH