A portable radiation imaging system (10) includes a radiation source (11), a radiation detector (7), a remote trigger unit (17) that activates the radiation source (11) and the radiation detector (7) to initiate an imaging operation, a computing device (13) that receives and processes image data generated by the radiation detector (7), and a universal power box (UPB) (1) operatively connected to the radiation source, the radiation detector, the trigger unit and the computing device. A first wireless link (50) is established between the UPB (1) and the computing device (13), and a second wireless link (60) is established between the trigger unit (17) and the UPB (1). Under the control of the UPB (1), the trigger unit uses the second wireless link (50) to send a control signal to the radiation source (11) to initiate the radiation operation, and the computing device (13) uses the first wireless link (50) to receive image data from the radiation detector (7). The trigger unit (17) can remotely initiate the radiation operation.