Control device, control method, and control program

1 . A control device comprising:

at least one processor,

the control device controlling an irradiation field of radiation with which a radiation detector is irradiated,

wherein the processor is configured to set a first control amount to be smaller than a second control amount,

wherein the first control amount is an amount with which the irradiation field, in a case where a required irradiation region is a maximum region detectable by the radiation detector, is extended outside the required irradiation region, the required irradiation region being an irradiation region of the radiation required in capturing a radiation image, and

wherein the second control amount is an amount with which the irradiation field, in a case where the required irradiation region is inside the maximum region, is extended outside the required irradiation region.

2 . The control device according to claim 1 ,

wherein the processor is configured to set the first control amount and the second control amount to the same amount in a case where a difference between the maximum region and the required irradiation region is less than an amount by which the irradiation field is extended outside the required irradiation region using the first control amount.

3 . The control device according to claim 1 ,

wherein an area of the irradiation field extended in accordance with the second control amount is less than or equal to an area of the irradiation field extended using the first control amount.

4 . The control device according to claim 1 ,

wherein a detection surface of the radiation detector for the radiation has a rectangular shape, and

the first control amount and the second control amount are set in accordance with each side of the detection surface.

5 . The control device according to claim 1 ,

wherein the processor is configured to set a target region of image analysis in controlling a dose of the radiation to be inside a radiation image obtained in accordance with the first control amount or the second control amount by a predetermined amount.

6 . The control device according to claim 5 ,

wherein the radiation image has a rectangular shape, and

the predetermined amount is set in accordance with each side of the radiation image.

7 . The control device according to claim 5 ,

wherein the processor is configured to set the predetermined amount of the radiation image obtained in accordance with the first control amount to be smaller than the predetermined amount of the radiation image obtained in accordance with the second control amount.

8 . The control device according to claim 1 ,

wherein the processor is configured to:

in a case where the required irradiation region is inside the maximum region, perform image processing of filling a portion outside the required irradiation region in a radiation image obtained in accordance with the second control amount with a color set in advance; and

perform a control of displaying the radiation image after passing through the image processing on a display.

9 . A control method executed by a processor of a control device including at least one processor and controlling an irradiation field of radiation with which a radiation detector is irradiated, the control method comprising:

setting a first control amount to be smaller than a second control amount,

wherein the first control amount is an amount with which the irradiation field, in a case where a required irradiation region is a maximum region detectable by the radiation detector, is extended outside the required irradiation region, the required irradiation region being an irradiation region of the radiation required in capturing a radiation image, and

wherein the second control amount is an amount with which the irradiation field, in a case where the required irradiation region is inside the maximum region, is extended outside the required irradiation region.

10 . A non-transitory computer-readable storage medium storing a control program for causing a processor of a control device including at least one processor and controlling an irradiation field of radiation with which a radiation detector is irradiated, to execute:

setting a first control amount to be smaller than a second control amount,

wherein the first control amount is an amount with which the irradiation field, in a case where a required irradiation region is a maximum region detectable by the radiation detector, is extended outside the required irradiation region, the required irradiation region being an irradiation region of the radiation required in capturing a radiation image, and

wherein the second control amount is an amount with which the irradiation field, in a case where the required irradiation region is inside the maximum region, is extended outside the required irradiation region.