Radiation imaging apparatus, radiation imaging system, method of controlling radiation imaging apparatus, and non-transitory computer-readable storage medium

A control method for a radiation imaging apparatus comprising an image sensing region including a plurality of conversion elements configured to acquire a radiation image, a plurality of detection units arranged in the image sensing region and configured to monitor incident radiation, and a readout unit configured to read out signals from the plurality of detection units,

• the control method including a first step and a second step,
• the first step including causing the readout unit to output a composition signal obtained by composing signals from the plurality of detection units, detecting a start of irradiation with radiation based on the composition signal, and shifting to the second step, and
• the second step including
• acquiring a plurality of first signals individually read out from the plurality of detection units to the readout unit,
• deciding a signal component, of the composition signal, which is output from a selected detection unit of the plurality of detection units in accordance with a ratio of the first signal from the selected detection unit to a sum of the plurality of first signals, and
• acquiring an integrated dose of radiation incident on the selected detection unit based on the signal component and a first signal, of the plurality of first signals, which is output from the selected detection unit.

A non-transitory computer-readable storage medium storing a program for causing a computer to execute a control method for a radiation imaging apparatus comprising an image sensing region including a plurality of conversion elements configured to acquire a radiation image, a plurality of detection units arranged in the image sensing region and configured to monitor incident radiation, and a readout unit configured to read out signals from the plurality of detection units,

• the control method including a first step and a second step,
• the first step including causing the readout unit to output a composition signal obtained by composing signals from the plurality of detection units, detecting a start of irradiation with radiation based on the composition signal, and shifting to the second step, and
• the second step including
• acquiring a plurality of first signals individually read out from the plurality of detection units to the readout unit,
• deciding a signal component, of the composition signal, which is output from a selected detection unit of the plurality of detection units in accordance with a ratio of the first signal from the selected detection unit to a sum of the plurality of first signals, and
• acquiring an integrated dose of radiation incident on the selected detection unit based on the signal component and a first signal, of the plurality of first signals, which is output from the selected detection unit.