A mobile X-ray system for digital tomography is disclosed. The mobile X-ray system comprising a multiple degree of freedom robotic arm comprising one or more extendable arms and a column member； an X-ray source mounted on an extendable arm of the one or more extendable arms； an X-ray detector； and a control unit coupled to the robotic arm, the X-ray source and the X-ray detector, wherein the control unit is configured to control the movement of the extendable arm and the column member for moving the X-ray source along a path to perform tomography imaging of a subject.
