A low THD sinusoidal current driver for Electrical Impedance Tomography is proposed and analyzed in this paper. A discrete common-mode feedback method is proposed to increase the accuracy of output current amplitude and output impedance. The proposed current driver is designed in 65nm technology under 3.3 V supply with chip area of 0.0843 mm^2. The maximum output current amplitude is 1.2 mA. According to simulation results, the proposed current driver achieves an averaged THD of 0.098% at 1 mA output current amplitude and 500 kHz output current frequency. The simulated output impedance is higher than 4 MΩ at load impedance lower than 3.5 kΩ. The current consumption of the proposed current driver is only 1.47 mA and provides a current efficiency of 81.6%.