The portable X-ray machine is a small (micro) X-ray machine that can achieve the purpose of fluoroscopy, which can image on the principle of X-ray. The portable X-ray machine is mainly composed of an X-ray tube, a power supply, and a control circuit. The X-ray tube is composed of a cathode filament, an anode target, and a vacuum glass tube, which provides a high-voltage electric field to make the filament active and accelerating flow. The cathode forms a high-speed electron flow. The high-speed electron flow penetrates the object and is processed by the portable X-ray machine to generate a perspective picture. It can be updatedto  the portable digital x-ray machine when you add a flat panel detector and a computer , it is can be moved to the bedside of the patient.