a plurality of voltage to current converters connected to the waveform means for receiving the voltage waveforms, each converter being separately connected to each electrode for applying a repetitive current waveform to each respective electrode, all of said repetitive current waveforms together forming a spatial current pattern for application to the array to generate voltage signals at the electrodes with respect to a common ground, for use in forming an electrical impedance image of {HEAD ~ at least part} of a volume in {TAIL ~ the body} 
a plurality of voltage to current converters connected to the waveform means for receiving the voltage waveforms , each converter being separately connected to each electrode for applying a repetitive current waveform to each respective electrode , all of said repetitive current waveforms together forming a spatial current pattern for application to the array to generate voltage signals at the electrodes with respect to a common ground , for use in forming an electrical impedance image of { HEAD ~ at least part } of a volume in { TAIL ~ the body }
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