Information processing device, information processing method, program, and radiographic imaging system

An information processing method that is used for a radiographic imaging system including a radiation source and a radiation image detector having a detection surface to which radiation from the radiation source is emitted and on which a subject is positioned, and that includes deriving a body thickness of the subject, the information processing method comprising:

• acquiring a distance image generated by imaging an imaging range including the subject and the detection surface with a distance image capturing device;
• searching the distance image for a detection surface region where a part of the detection surface exists;
• acquiring a distance to the detection surface region that has been searched for, as a first distance from the distance image capturing device to the detection surface, based on the distance image;
• acquiring a distance from the distance image capturing device to the subject as a second distance based on the distance image;
• and
• deriving a difference between the first distance and the second distance as the body thickness of the subject,
• wherein, during the searching of the detection surface region,
• a region of interest, where the detection surface region is estimated to exist, is set based on a set value provisionally set as a value corresponding to the first distance and a size of the detection surface;
• and
• the detection surface region is searched for using the set region of interest as a search range.

A non-transitory computer-readable storage medium storing a program that is used for a radiographic imaging system including a radiation source and a radiation image detector having a detection surface to which radiation from the radiation source is emitted and on which a subject is positioned, the program causing a computer to execute a process including deriving a body thickness of the subject, the process comprising:

• acquiring a distance image generated by imaging an imaging range including the subject and the detection surface with a distance image capturing device;
• searching the distance image for a detection surface region where a part of the detection surface exists;
• acquiring a distance to the detection surface region that has been searched for, as a first distance from the distance image capturing device to the detection surface, based on the distance image;
• acquiring a distance from the distance image capturing device to the subject as a second distance based on the distance image;
• and
• deriving a difference between the first distance and the second distance as the body thickness of the subject,
• wherein, during the searching of the detection surface region,
• a region of interest, where the detection surface region is estimated to exist, is set based on a set value provisionally set as a value corresponding to the first distance and a size of the detection surface;
• and
• the detection surface region is searched for using the set region of interest as a search range.