Radiation output device, radiation imaging system and radiation imaging method

A radiation imaging system (10) and a radiation imaging method involves a radiation output device (18) having a plurality of radiation sources (30, 30a to 30e), wherein the plurality of radiation sources (30, 30a to 30e) are arranged in a curve in at least one direction, and radiation (16, 16a to 16e) is outputted from the plurality of radiation sources (30, 30a to 30e) that are arranged in a curve.