This paper details the development and preliminary validation of a portable Electric Impedance Tomography (EIT) system. Focused on ambulatory respiratory monitoring as a point-of-care device, the system consists of a compact and low power consumption device. The system portability is achieved using integrated solutions and through the incorporation of miniaturized components, while the low power requirements ensure extended operational periods on battery power. Validation experiments utilizing a customized resistor phantom mimicking a round geometry demonstrate the system's accuracy and sensitivity in reconstructing images in different scenarios and capturing dynamic impedance changes. Our portable EIT system offers a practical, mobile, and energy-efficient solution for continuous patient care.