Method and apparatus for fixed pattern noise correction using non-conductive state measurements

A control method for a radiation imaging apparatus including a plurality of pixels each including a conversion element configured to convert radiation into signal charge and a switch element configured to output an electrical signal corresponding to the signal charge and a signal line to which signals are supplied from the plurality of pixels, the method comprising:

• performing, during irradiation with radiation, a first operation of reading out a signal while the switch element of each of the plurality of pixels is in a non-conduction state and a second operation of reading out a signal while the switch element of a predetermined pixel of the plurality of pixels is in a conduction state,
• correcting a second signal value of a signal read out by the second operation by using a first signal value of a signal read out by the first operation,
• generating one image data based on the second signal value read out a signal from each of the plurality of pixels once and corrected by using the first signal value,
• performing, during non-irradiation with radiation, a third operation of reading out a signal from each of the plurality of pixels and a fourth operation of reading out a signal while the switch element of each of the plurality of pixels is in a non-conduction state,
• generating correction data from signals read out by the third operation and the fourth operation, and
• correcting the image data by using the correction data.

A signal processing apparatus that processes a signal output from a radiation imaging apparatus,

• the radiation imaging apparatus including a plurality of pixels each including a conversion element configured to convert radiation into signal charge and a switch element configured to output an electrical signal corresponding to the signal charge, a signal line to which signals are supplied from the plurality of pixels, and a readout circuit configured to read out a signal supplied to the signal line, wherein
• the readout circuit is configured to perform, during irradiation with radiation, a first operation of reading out a signal from the signal line while the switch element of each of the plurality of pixels is in a non-conduction state and a second operation of reading out a signal from the signal line while the switch element of a predetermined pixel of the plurality of pixels is in a conduction state, and to output signals read out by the first operation and the second operation, and
• the signal processing apparatus is configured to obtain the signals read out by the first operation and the second operation and to correct a second signal value of a signal read out by the second operation by using a first signal value of a signal read out by the first operation
• the signal processing apparatus is configured to generate one image data based on the second signal value read out a signal from each of the plurality of pixels once and corrected by using the first signal value,
• the readout circuit is configured to further perform, during non-irradiation with radiation, a third operation of reading out a signal from each of the plurality of pixels and a fourth operation of reading out a signal while the switch element of each of the plurality of pixels is in a non-conduction state, and to output signals read out by the third operation and the fourth operation, and
• the signal processing apparatus is configured to obtain the signals read out by the third operation and the fourth operation, to generate correction data from signals read out by the third operation and the fourth operation, and to correct the image data by using the correction data.