Apparatus and system

An apparatus comprising:

• multiple pixels including respective conversion elements that convert radiation or light into an electric charge and respective switch elements that output the electric charge generated by the conversion elements or a signal based on the electric charge, the multiple pixels being arranged in a matrix;
• a drive unit that outputs a driving signal for driving the switch elements;
• multiple drive lines that supply the driving signal outputted by the drive unit to the switch elements;
• a reading unit that processes the signal outputted from the pixels;
• multiple signal lines that are provided in association with columns of the pixels and that supply the signal generated by the pixels to the reading unit;
• a control unit that controls an operation of the drive unit and an operation of the reading unit;
• and
• a generating unit that receives a signal outputted from the reading unit and that generates a data signal,
• wherein while the radiation is emitted, the control unit causes a first operation to be performed such that the drive unit supplies the driving signal sequentially to the multiple drive lines and the reading unit generates a first signal, and causes a second operation to be performed right after the first operation such that the drive unit supplies no driving signal to the multiple drive lines and the reading unit generates a second signal, and
• wherein the generating unit corrects the first signal by using the second signal and generates the data signal.