Radiation image signal processing method, radiation image signal processing apparatus, radiation imaging system, and program

A radiation image signal processing apparatus in a radiation imaging system which includes an image sensor having a sensitive surface on which a plurality of pixels are two-dimensionally arranged, the system outputting signals electrically converted at the pixels in response to radiation incident as image information as pixel values, the radiation image signal processing apparatus comprising:

• a constant setting unit configured to determine a threshold for detecting noise components appearing in the respective pixels;
• and
• a threshold discrimination unit configured to discriminate pixels that output significant electrical conversion signals derived from incident radiation from pixels that output only signals due to noise specific to a sensor device based on the threshold from the constant setting unit,
• wherein the constant setting unit sets a signal obtained by statistically processing data obtained in advance to the threshold discrimination unit as the threshold.

A radiation imaging system comprising:

• a radiation source configured to irradiate an observation sample with radiation;
• a camera unit including an image sensor having a sensitive surface on which a plurality of pixels are two-dimensionally arranged;
• and
• an image signal processing unit configured to output signals electrically converted at the pixels in response to incidence of radiation containing information on the observation sample as pixel values, wherein
• the image signal processing unit comprises:
• a constant setting unit configured to determine a threshold for detecting noise components appearing in the respective pixels;
• and
• a threshold discrimination unit configured to discriminate pixels that output significant electrical conversion signals derived from radiation from pixels that output only signals due to noise specific to a sensor device based on the threshold from the constant setting unit, and
• the constant setting unit sets a signal obtained by statistically processing data obtained in advance to the threshold discrimination unit as the threshold.