The present disclosure is for minimizing the problem of AED sensor malfunction, and comprises: a panel having a plurality of sensing elements for sensing an X-ray, and converting an X-ray into an electrical signal; an AED sensor for sensing an X-ray; and a main control unit for obtaining image data by reading out the charge of the panel when an X-ray is sensed by the AED sensor, wherein the main control unit may determine whether or not reading out is to be performed on the basis of the acceleration of the panel even when the AED sensor senses an X-ray.