Operation method of radiation imaging apparatus having sensor substrate and bias power supply, radiation imaging apparatus, and computer-readable medium

A radiation imaging apparatus comprising:

• a sensor substrate including a plurality of pixels arranged in a matrix, each pixel including a conversion element configured to convert radiation or light into an electric charge and accumulate the electric charge and a switch element connected to the conversion element;
• a bias power supply configured to supply a bias potential to the conversion element;
• a driving circuit configured to supply a driving potential of the switch element;
• a readout circuit configured to read out a signal from the switch element;
• a control calculation unit configured to change the driving potential supplied to the switch element and change the bias potential supplied to the conversion element.

A radiation imaging apparatus including:

• a conversion element configured to convert radiation or light into an electric charge and accumulate the electric charge;
• a switch element;
• a bias power supply configured to supply a bias potential to a terminal of the conversion element;
• a driving circuit configured to supply a driving potential to a control electrode of the switch element to control the switch element;
• a readout circuit connected to the switch element to read out a signal from the conversion element via the switch element;
• and a control calculation unit, comprising:
• the control calculation unit configured to change the driving potential supplied to the control electrode of the switch element and change the bias potential supplied to the terminal of the conversion element.

A radiation imaging apparatus comprising:

• a conversion element configured to convert radiation or light into an electric charge and accumulate the electric charge;
• a switch element;
• a bias power supply configured to supply a bias potential to a terminal of the conversion element;
• a driving circuit configured to supply a driving potential to a control electrode of the switch element to control the switch element;
• and a readout circuit connected to the switch element to read out a signal from the conversion element via the switch element, wherein
• a first terminal of the switch element and a first terminal of the conversion element are connected, the readout circuit supplies a reference potential to a second terminal of the switch element, the bias power supply supplies a first bias potential to a second terminal of the conversion element, and the driving circuit supplies, to the control electrode, a first driving potential,
• the bias power supply changes the bias potential supplied to the second terminal of the conversion element from the first bias potential to a second bias potential to cause the conversion element to accumulate the electric charge,
• the readout circuit reads out the amount of electric charge from the conversion element via the switch element by supplying a second driving potential from the driving circuit to the control electrode.