1. An X-ray imaging apparatus comprising: an X-ray generating unit for generating pulse-shaped X-rays; a splitting element that spatially splits X-rays generated by said X-ray generating unit; a detecting unit that detects intensity of each of the split X-rays split by said splitting element and transmitted through a detection object; a transport unit that moves said X-ray generating unit, said splitting element, the detection object or said detecting unit; and a transport control unit that controls a scanning time of the X-rays irradiated onto the detection object by means of said transport unit, wherein said detecting unit comprises a time delay integration type detecting unit which has a plurality of pixel areas and is so arranged that each of the split X-rays split by said splitting element is discretely irradiated over two or more than two pixel areas of said detecting unit, and wherein said X-ray generating unit and said detecting unit operate with a cycle period of X-ray pulse generation and with a cycle period of electric charge transfer, respectively, and wherein those periods are synchronized such that X-rays are irradiated onto the detection object between timing T 0 and timing T 1 and X-rays are not irradiated onto the detection object between timing T 1 and timing T 2 while electric charge transfer is performed in said detecting unit at the timings T 0 , T 1 and T 2 .