{TAIL ~ 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 {HEAD ~ use} in forming an electrical impedance image of at least part of a volume in the body 
{ TAIL ~ 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 { HEAD ~ use } in forming an electrical impedance image of at least part of a volume in the body
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