Radiation imaging apparatus and radiation imaging system

A radiation imaging apparatus, comprising:

• a plurality of pixels arranged in an array in an image sensing region and configured to obtain a radiation image;
• a first detecting element and a second detecting element each including a conversion element configured to convert radiation into an electrical signal, being for obtaining radiation irradiation information, corresponding to radiation irradiated to the image sensing region, including at least one of start of radiation irradiation, end of radiation irradiation, a radiation irradiation intensity, or a radiation irradiation dose;
• a signal processing circuit configured to process a first electrical signal output from the first detecting element and a second electrical signal output from the second detecting element, wherein
• the radiation irradiation information is information different from the radiation image,
• a sensitivity of the second detecting element to convert radiation into an electrical signal is lower than that of the first detecting element, and
• the signal processing circuit generates the radiation irradiation information based on a difference between the first electrical signal and the second electrical signal.

A radiation imaging apparatus, comprising:

• a plurality of pixels arranged in an array in an image sensing region and configured to convert light converted from radiation by a scintillator into an electrical signal to obtain a radiation image;
• a first photoelectric conversion element and a second photoelectric conversion element configured to convert light converted by the scintillator into an electrical signal, being for obtaining radiation irradiation information, corresponding to radiation irradiated to the image sensing region, including at least one of start of radiation irradiation, end of radiation irradiation, a radiation irradiation intensity, or a radiation irradiation dose;
• a signal processing circuit configured to process a first electrical signal output from the first photoelectric conversion element and a second electrical signal output from the second photoelectric conversion element, wherein
• the radiation irradiation information is information different from the radiation image,
• a region of the second photoelectric conversion element for detecting the radiation is smaller than that of the first detection element by a shielding member that is arranged between the scintillator and the second photoelectric conversion element and shields the light converted by the scintillator, and a sensitivity of the second photoelectric conversion element to convert radiation into an electrical signal is lower than that of the first photoelectric conversion element, and
• the signal processing circuit generates the radiation irradiation information based on a difference between the first electrical signal and the second electrical signal.