Imaging apparatus, imaging system, and method for controlling imaging apparatus

An imaging apparatus comprising:

• a detector in which a plurality of pixels each including a conversion element configured to convert radiation or light into an electric charge is arranged in a matrix form, wherein the detector performs an exposure imaging operation for outputting exposure image data corresponding to radiation or light with which the detector is irradiated, a correction imaging operation for outputting correction image data that is image data in a dark state for correcting the exposure image data, an exposure preparation operation for stabilizing a characteristic of the conversion element during a time between the start of application of a bias to the conversion element and the exposure imaging operation, and a correction imaging preparation operation including an initialization operation for initializing the conversion element between the exposure imaging operation and the correction imaging operation;
• a correction unit configured to correct the exposure image data using the correction image data;
• and
• a control unit configured to control the operation of the detector,
• wherein the control unit determines the number of times of the initialization operation according to the amount of variation in offset at the time of shifting from the exposure preparation operation to the exposure imaging operation, and controls the operation of the detector so as to perform the initialization operation based on the determined number of times.