An intra-oral x-ray system combines several tube voltages with varying differences by a pulse method and emits the voltages in one x-ray irradiation to obtain an x-ray imaging with clear contrast. Before x-ray irradiation, the user can preset and save the tube voltage data in the x-ray system by the size of the patient, the area, the purpose of diagnosis and the detector sensitivity. The user can select the saved data or with discretion change the exposure conditions.
