An X-ray imaging system includes a plurality of electronic cassettes having FPDs. One of the plural electronic cassettes for use in imaging is selected by input operation. Control is performed in a first mode operation being normal for the electronic cassette selected in the selecting step. Control is performed in a second mode operation being auxiliary of which driving power is lower than in the first mode operation for one of the electronic cassettes in an unselected state in the selecting step. Assuming that irradiation of the radiation is detected in the second mode operation, error information is displayed in relation to selecting the electronic cassette in the selecting step. For example, the first and second mode operations are pixel reset in which charge stored in pixels are swept in an FPD.

In a fluoroscopic image capturing apparatus, an internal structure of a specimen can be appropriately evaluated. To provide a fluoroscopic image capturing apparatus 1 including: a timing control device 13 configured to output an irradiation timing signal S1 in synchronization with a drive timing signal S4 for driving a specimen 31 or a timing signal S5 as a detection result of an operation of the specimen 31; electromagnetic wave generation units 22 and 23 configured to irradiate, in synchronization with the irradiation timing signal Si, the specimen 31 with a pulsed electromagnetic wave beam B1 having a wavelength with which the electromagnetic wave beam B1 is transmitted through the specimen 31; and an electromagnetic wave detection device 41 configured to receive the electromagnetic wave beam B1 transmitted through the specimen 31.