Figure 1

Schematic diagram for ICNE multi-echo pulse sequence to acquire dual-frequency conductivity images. ‘RF’ shows the timing for excitation of 90° and 180° RF pulses. G _z , G _y and G _x are slice selection gradient, phase encoding gradient and readout gradient, respectively. ${\zeta }_j^{\pm }$ is the j-th echo signal. ‘ICNE’ shows the alternating injection currents in the form of pulses synchronized with the RF pulse.