Radiographic image processing apparatus, method and recording medium

A radiographic image processing method comprising:

• obtaining a plurality of radiographic images generated by arranging a plurality of detection unit that detect radiation that has been output from a radiation source and passed through a subject in such a manner that at least portions of the plurality of detection unit are overlapped with each other in an irradiation direction of the radiation, and by arranging at least one marker at a position to be detected by the plurality of detection unit, and by detecting the radiation that has passed through the subject and the marker by each of the plurality of detection unit;
• obtaining first information representing a distance between a detection surface of a first detection unit located closest to the radiation source among the plurality of detection unit and a detection surface of a second detection unit other than the first detection unit among the plurality of detection unit;
• obtaining second information representing a magnification ratio of a second marker image of the at least one marker included in a second radiographic image obtained by the second detection unit with respect to a first marker image of the at least one marker included in a first radiographic image obtained by the first detection unit;
• calculating, based on the first information and the second information, a radiation-source-to-image-surface distance, which is a distance between the radiation source and the detection surface of the first detection unit;
• performing scattered radiation removal processing on at least one of the plurality of radiographic images by using the radiation-source-to-image-surface distance;
• and
• performing energy subtraction processing on the plurality of radiographic images which include the at least one radiographic image on which the scattered radiation removal processing is performed.

A non-transitory recording medium having recorded therein a radiographic image processing program that causes a computer to execute:

• a procedure that obtains a plurality of radiographic images generated by arranging a plurality of detection unit that detect radiation that has been output from a radiation source and passed through a subject in such a manner that at least portions of the plurality of detection unit are overlapped with each other in an irradiation direction of the radiation, and by arranging at least one marker at a position to be detected by the plurality of detection unit, and by detecting the radiation that has passed through the subject and the marker by each of the plurality of detection unit;
• a procedure that obtains first information representing a distance between a detection surface of a first detection unit located closest to the radiation source among the plurality of detection unit and a detection surface of a second detection unit other than the first detection unit among the plurality of detection unit;
• a procedure that obtains second information representing a magnification ratio of a second marker image of the at least one marker included in a second radiographic image obtained by the second detection unit with respect to a first marker image of the at least one marker included in a first radiographic image obtained by the first detection unit;
• a procedure that calculates, based on the first information and the second information, a radiation-source-to-image-surface distance, which is a distance between the radiation source and the detection surface of the first detection unit;
• a procedure that performs scattered radiation removal processing on at least one of the plurality of radiographic images by using the radiation-source-to-image-surface distance;
• and
• a procedure that performs energy subtraction processing on the plurality of radiographic images which include the at least one radiographic image on which the scattered radiation removal processing is performed.