Radiation imaging apparatus and imaging system

A radiation imaging apparatus, comprising:

• a sensor array in which a plurality of sensors are arranged so as to form a plurality of rows and a plurality of columns;
• and
• a driver configured to drive the sensor array;
• each of the plurality of sensors including a detector configured to detect radiation, a first sampler configured to sample a signal from the detector, and a second sampler configured to sample a signal from the detector, wherein
• each of the first and second samplers are connected to a signal line configured to propagate a signal from the detector,
• the driver is configured to use the first and second samplers to respectively perform first and second sampling driving operations to sample the signal propagating through the signal line, the driving operations employing an energy subtraction method using first image data based on signals sampled in the first sampling driving operation and second image data based on signals sampled in the second sampling driving operation, and
• the driver is configured to drive the second sampler to start a preliminary sampling driving operation that is different from the second sampling driving operation, before the completion of the first sampling driving operation.

An arithmetic processing apparatus, comprising at least one processor circuit with a memory comprising instructions, that when executed by the processor circuit, cause the at least one processor circuit to perform an arithmetic processing based on an energy subtraction method using a plurality of sets of image data based on signals sampled in sampling driving operation;

• the plurality of sets of image data being obtained based on first and second sampling driving operations;
• the first sampling driving operation sampling a signal corresponding to a first radiation dose;
• and
• the second sampling driving operation sampling a signal corresponding to a second radiation dose different from the first radiation dose, wherein
• the second sampling driving operation is started before the completion of the first sampling driving operation.

A method for performing an arithmetic processing based on an energy subtraction method using a plurality of sets of image data based on signals sampled in sampling driving operation, comprising the steps of:

• obtaining the plurality of sets of image data based on first and second sampling driving operations;
• the first sampling driving operation sampling a signal corresponding to a first radiation dose;
• and
• the second sampling driving operation sampling a signal corresponding to a second radiation dose different from the first radiation dose, wherein
• the second sampling driving operation is started before the completion of the first sampling driving operation.