Information processing device, information processing method, program, and radiographic imaging system
An information processing device is configured to execute: distance image acquisition processing of acquiring a distance image generated by imaging an imaging range including a subject and a detection surface with a distance image capturing device; detection surface region search processing of searching the distance image for a detection surface region where a part of the detection surface exists; first distance acquisition processing of 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; second distance acquisition processing of acquiring a distance from the distance image capturing device to the subject as a second distance based on the distance image; and body thickness derivation processing of deriving a difference between the first distance and the second distance as a body thickness of the subject.
1 . An information processing device 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 performs processing of deriving a body thickness of the subject, the information processing device comprising:
a processor,
wherein the processor is configured to execute:
distance image acquisition processing of acquiring a distance image generated by imaging an imaging range including the subject and the detection surface with a distance image capturing device;
detection surface region search processing of searching the distance image for a detection surface region where a part of the detection surface exists;
first distance acquisition processing of 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;
second distance acquisition processing of acquiring a distance from the distance image capturing device to the subject as a second distance based on the distance image; and
body thickness derivation processing of deriving a difference between the first distance and the second distance as the body thickness of the subject,
wherein the processor is configured to:
during the detection surface region search processing,
set a region of interest, where the detection surface region is estimated to exist, based on a set value provisionally set as a value corresponding to the first distance and a size of the detection surface; and
search for the detection surface region using the set region of interest as a search range.
2 . The information processing device according to claim 1 ,
wherein the processor is configured to:
during the second distance acquisition processing,
acquire a distance to radiation center coordinates corresponding to a center of a radiation beam emitted from the radiation source toward the subject as the second distance based on the distance image.
3 . The information processing device according to claim 1 ,
wherein the processor is configured to:
during the detection surface region search processing,
exclude an abnormal pixel having an abnormal pixel value from the region of interest.
4 . The information processing device according to claim 1 ,
wherein the processor is configured to:
during the detection surface region search processing,
set a position of the region of interest according to an imaging site of the subject.
5 . The information processing device according to claim 1 ,
wherein the distance image capturing device is a TOF type distance image camera.
6 . A radiographic imaging system comprising:
the information processing device according to claim 1 ,
wherein a radiographic imaging condition is decided on based on the body thickness derived by the body thickness derivation processing.
7 . The radiographic imaging system according to claim 6 ,
wherein the decided-on radiographic imaging condition is changeable by a user's operation.
8 . The information processing device according to claim 2 ,
wherein the processor is configured to:
during the second distance acquisition processing,
derive the radiation center coordinates based on a relative positional relationship between the distance image capturing device and the radiation source.
9 . The information processing device according to claim 3 ,
wherein the region of interest is a region including an end portion of the radiation image detector and a background outside the radiation image detector.
10 . The information processing device according to claim 9 ,
wherein the processor is configured to:
during the detection surface region search processing,
exclude, from the region of interest, a pixel that has a distance equal to or greater than a certain value and corresponds to the background and a flying pixel that appears at a boundary part between the end portion and the background, as the abnormal pixels.
11 . 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.
12 . 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.