JP2012061197A - Radiation ray image photographing device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a dosage of an object to be inspected when performing photography focused in radiation field in the case that a plurality of radiation ray images are obtained by performing photography from different directions.SOLUTION: When photographing the two radiation ray images for displaying a three-dimensional image, a region specifying part 2c specifies a concerned region of the first radiation ray image after photographing the first radiation ray images G1. Then, the radiation field is set by adjusting an opening of a collimator 22 by a radiation field setting part 2d so that a radiation ray is irradiated to only a region corresponding to the concerned region which is specified by the first radiation ray image G1 at the photographing of the second radiation ray image G2. After that, the second radiation ray image is photographed, and the three-dimensional image using the two radiation ray images is displayed.

Description

  The present invention relates to a radiographic imaging apparatus and method for acquiring a plurality of radiographic images by imaging a subject from a plurality of different directions.

  As an apparatus for displaying a medical image such as a radiographic image, an apparatus for displaying a stereoscopic image (three-dimensional image, stereo image) based on stereoscopic image data including parallax information between the left and right eyes has been proposed. Such a stereoscopic image is obtained by irradiating a subject with radiation from different directions, detecting radiation transmitted through the subject with a radiation detector, and obtaining a plurality of radiation images having parallax with each other. Based on the image, it is displayed three-dimensionally so as to be stereoscopically viewable. Thus, by displaying the stereoscopic image in a three-dimensional manner so as to be stereoscopically viewed, it is possible to observe a radiographic image with a sense of depth, thereby making diagnosis easier.

  In addition, when imaging using radiation, harmful effects on the human body by irradiating a part that is not necessary for observation of the subject and deterioration of image quality performance due to scattered light from parts unnecessary for the observation, etc. In order to prevent radiation, imaging is often performed using an irradiation field stop that limits the irradiation area (irradiation field) of the radiation on the subject so that the radiation is irradiated only on a necessary part of the subject. . For example, in a mammography imaging device used for breast cancer screening or the like, when performing diagnosis by continuously capturing radiographic images for follow-up observation, a region where a lesion such as a mass or calcification is present was captured in the past. It is known in advance by diagnosis using radiographic images. For this reason, if spot imaging is performed using an irradiation field stop so that radiation is irradiated only to a portion where a lesion exists, the exposure amount of the subject can be reduced and the image quality due to scattered light can be reduced. Can be prevented.

  Here, a method of performing spot imaging using an irradiation field stop when imaging a plurality of radiographic images for displaying the above-described stereoscopic image has been proposed (see Patent Document 1). By using the technique described in Patent Document 1, it is possible to display a stereoscopic image of a specific portion of the subject using a plurality of radiation images acquired by spot imaging.

  There has also been proposed a method of displaying a stereoscopic image during imaging by simultaneously imaging a subject from two different directions using two radiation sources (see Patent Document 2). In the method of Patent Document 2, when a region of interest is set in a stereoscopic image displayed on a monitor during photographing, an irradiation field is set so that radiation is irradiated only to that portion. As a result, at the time of imaging after setting the irradiation field, radiation is not irradiated to unnecessary portions of the subject, so that the exposure amount of the subject can be reduced.

  On the other hand, in a radiographic imaging apparatus, in order to observe the affected area in more detail, the radiation source is moved, the subject is irradiated with radiation from a plurality of different directions, and imaging is performed. Tomosynthesis photography that can obtain an image in which the cross section is emphasized has been proposed. In tomosynthesis imaging, depending on the characteristics of the imaging device and the required tomographic image, the radiation source can be moved in parallel with the radiation detector, or moved in a circle or ellipse arc to create different irradiation angles. A plurality of radiographic images are acquired by imaging the subject at the irradiation position, and a tomographic image is generated by reconstructing these radiographic images using a simple backprojection method or a backprojection method such as a filter backprojection method. .

JP 10-146330 A JP-A-9-2249327

  However, in the technique described in Patent Document 1, the exposure dose of the subject can be reduced when the portion where the lesion exists is known in advance, but spot imaging is possible when the portion where the lesion exists is not known. Can not do. In addition, the technique described in Patent Document 2 can reduce the exposure dose of the subject after the attention area is set, but the subject is irradiated with radiation from two radiation sources until the attention area is set. As a result, the exposure dose of the subject increases. Moreover, since the method of patent document 2 requires two radiation sources, an apparatus enlarges and cost increases.

  The present invention has been made in view of the above circumstances, and in the case where a plurality of radiographic images are acquired by performing imaging from different directions, it is possible to reduce the exposure dose of a subject when performing imaging with a narrowed irradiation field. Objective.

A radiographic imaging apparatus according to the present invention includes a radiation irradiating means for irradiating a subject with radiation,
Radiation detecting means for detecting the radiation irradiated by the radiation irradiating means and transmitted through the subject and outputting a radiation image of the subject;
An imaging control unit that irradiates the subject with the radiation from a plurality of imaging directions, and detects a plurality of radiographic images with different imaging directions due to the irradiation of the radiation by the radiation detection unit;
An irradiation field stop means that is provided between the radiation irradiation means and the subject, and sets an irradiation field of the radiation on the subject;
By the irradiation field stop means, the size of the irradiation field at the time of capturing the second and subsequent radiation images is made smaller than the size of the irradiation field at the time of capturing the first radiation image among the plurality of radiation images. The irradiation field setting means is provided.

  In the radiographic image capturing apparatus according to the present invention, after capturing the first radiographic image of the plurality of radiographic images and before capturing the second radiographic image, the first radiographic image is of interest. An area specifying unit for specifying the area may be further provided.

  In the radiographic image capturing apparatus according to the present invention, the region specifying unit may include the one of the plurality of radiographic images after capturing the first radiographic image and before capturing the second radiographic image. The region of interest may be specified based on a radiographic image of the eye.

The radiographic image capturing apparatus according to the present invention further includes display means for displaying at least one of the plurality of radiographic images,
The region specifying means displays the first radiographic image on the display means after taking the first radiographic image of the plurality of radiographic images and before taking the second radiographic image, The region of interest may be specified by receiving designation of the region of interest in the first radiation image.

  Further, in the radiographic imaging device according to the present invention, the irradiation field setting means corresponds to the region of interest in the subject at the time of capturing the second and subsequent radiographic images after capturing the first radiographic image. It is good also as a means to set the said irradiation field so that the said radiation is irradiated only to the area | region to perform.

  In the radiographic imaging apparatus according to the present invention, the display unit cuts out the image of the region of interest from the first radiographic image, and uses the image of the region of interest and the second and subsequent radiographic images. Means for displaying a stereoscopic image may be used.

  In the radiographic imaging device according to the present invention, the image of the region of interest is cut out from the first radiographic image, the image of the region of interest and the second and subsequent radiographic images are reconstructed, and the subject A tomographic image generating unit that generates a tomographic image of a desired cross section corresponding to the region of interest of the specimen may be further provided.

A radiographic imaging method according to the present invention includes a radiation irradiation means for irradiating a subject with radiation,
Radiation detecting means for detecting the radiation irradiated by the radiation irradiating means and transmitted through the subject and outputting a radiation image of the subject;
An imaging control unit that irradiates the subject with the radiation from a plurality of imaging directions, and detects a plurality of radiographic images with different imaging directions due to the irradiation of the radiation by the radiation detection unit;
A radiographic imaging method in a radiographic imaging device, comprising: an irradiation field stop unit that is provided between the radiation irradiation unit and the subject and sets the radiation field on the subject,
The size of the irradiation field at the time of capturing the second and subsequent radiation images is made smaller than the size of the irradiation field at the time of capturing the first radiation image among the plurality of radiation images. It is.

  According to the present invention, when the subject is imaged from a plurality of different directions and a plurality of radiation images are acquired, the radiation of the second and subsequent sheets is larger than the size of the irradiation field at the time of capturing the first radiation image. The size of the irradiation field at the time of taking an image is reduced. For this reason, it is possible to reduce the amount of radiation applied to the subject when the second and subsequent radiation images are taken, and as a result, it is possible to reduce the amount of exposure of the subject. Further, since the subject is not irradiated with radiation from a plurality of imaging directions at the same time, it is not necessary to prepare a plurality of radiation irradiation means, and as a result, the configuration of the apparatus can be simplified, and the apparatus The cost can be reduced.

  In addition, by setting the irradiation field so that the radiation is irradiated only to the region corresponding to the region of interest specified in the subject after the first radiographic image is captured, the second and subsequent radiographic images are captured. In the subject, it is possible to prevent radiation from being applied to portions other than the region corresponding to the region of interest.

  In addition, the image of the region of interest can be stereoscopically viewed by cutting out the image of the region of interest from the first radiation image and displaying the stereoscopic image using the image of the region of interest and the second and subsequent radiation images. it can.

  In addition, the image of the region of interest is cut out from the first radiographic image, the image of the region of interest and the second and subsequent radiographic images are reconstructed, and a tomographic image of a desired cross section corresponding to the region of interest of the subject is obtained. By generating, a tomographic image of the region of interest can be obtained.

1 is a schematic configuration diagram of a radiographic imaging device according to an embodiment of the present invention. The figure which looked at the arm part of the radiographic imaging apparatus shown in FIG. 1 from the right direction of FIG. The block diagram which shows schematic structure inside the computer of the radiographic imaging apparatus shown in FIG. The figure for demonstrating designation | designated of the region of interest with respect to the 1st radiation image A flowchart showing processing performed in the present embodiment Diagram for explaining the second radiographic image Illustration for explaining tomosynthesis shooting The block diagram which shows schematic structure inside the computer of the radiographic imaging apparatus in the case of performing tomosynthesis imaging | photography

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a radiographic imaging apparatus according to an embodiment of the present invention. In order to generate a stereoscopic image for stereoscopically viewing a radiographic image of a breast, the radiographic image capturing apparatus 1 captures a breast M from different imaging directions and acquires a plurality of radiographic images. As shown in FIG. 1, the radiographic imaging device 1 includes an imaging unit 10, a computer 2 connected to the imaging unit 10, a monitor 3 connected to the computer 2, and an input unit 4.

  The imaging unit 10 includes a base 11, a rotary shaft 12 that is movable in the vertical direction (Z direction) with respect to the base 11, and a rotatable rotation shaft 12 and an arm portion 13 that is connected to the base 11 by the rotation shaft 12. I have. FIG. 2 shows the arm 13 viewed from the right direction in FIG.

  The arm portion 13 has an alphabet C shape, and a radiation table 16 is attached to one end of the arm portion 13 so as to face the imaging table 14 at the other end. The rotation and vertical movement of the arm unit 13 are controlled by an arm controller 31 incorporated in the base 11.

  A radiation detector 15 such as a flat panel detector and a detector controller 33 that controls reading of a charge signal from the radiation detector 15 are provided inside the imaging table 14.

  The imaging table 14 includes a charge amplifier that converts the charge signal read from the radiation detector 15 into a voltage signal, a correlated double sampling circuit that samples the voltage signal output from the charge amplifier, and a voltage signal. A circuit board or the like provided with an AD conversion unit for converting into a digital signal is also installed.

  In addition, the photographing table 14 is configured to be rotatable with respect to the arm unit 13, and even when the arm unit 13 rotates with respect to the base 11, the direction of the photographing table 14 is fixed to the base 11. can do.

  The radiation detector 15 can repeatedly perform recording and reading of a radiation image, and may use a so-called direct type radiation detector that directly receives radiation to generate charges, or radiation. May be used as a so-called indirect radiation detector that converts the light into visible light and converts the visible light into a charge signal. As a radiation image signal readout method, a radiation image signal is read out by turning on / off a TFT (thin film transistor) switch, or a radiation image is emitted by irradiating reading light. It is desirable to use a so-called optical readout system in which a signal is read out, but the present invention is not limited to this, and other systems may be used.

  A radiation source 17 and a radiation source controller 32 are housed inside the radiation irradiation unit 16. The radiation source controller 32 controls the timing of irradiating radiation from the radiation source 17 and the radiation generation conditions (tube current, time, tube current time product, etc.) in the radiation source 17.

  Further, a collimator (irradiation field stop) 22 is connected to the radiation irradiation unit 16, and the range of radiation irradiated to the breast M (irradiation field) can be set by adjusting the opening by a control signal from the computer 2. It is like that.

  Further, in the central portion of the arm portion 13, a compression plate 18 that is disposed above the imaging table 14 and presses against the breast M, a support portion 20 that supports the compression plate 18, and a support portion 20 are arranged in the vertical direction ( A moving mechanism 19 for moving in the Z direction) is provided. The position of the compression plate 18 and the compression pressure are controlled by the compression plate controller 34.

  The computer 2 includes a central processing unit (CPU) and a storage device such as a semiconductor memory, a hard disk, and an SSD, and the control unit 2a, the radiation image storage unit 2b, and the area shown in FIG. A specifying unit 2c, an irradiation field setting unit 2d, and a display control unit 2e are configured.

  The controller 2a outputs predetermined control signals to the various controllers 31 to 34 to control the entire apparatus. A specific control method will be described later. Note that the control unit 2a corresponds to a photographing control unit.

  The radiographic image storage unit 2b stores two radiographic images detected by the radiation detector 15 by imaging from two different imaging directions.

  Of the two radiographic images, the region specifying unit 2c captures the first radiographic image (referred to as G1), which serves as a stereoscopic reference, and before capturing the second radiographic image (referred to as G2). Next, the region of interest of the radiation image G1 is specified. Here, the region of interest is a region having a particularly high degree of interest in diagnosis using an image. In the case of a breast, the region of interest is a region where a lesion such as a tumor or calcification is present or a region having a high mammary gland density. It is. Specifically, the region specifying unit 2c displays the first radiation image G1 on the monitor 3, and accepts designation of the region of interest using the input unit 4 by the operator. FIG. 4 is a diagram for explaining designation of a region of interest for the first radiation image G1. In the radiation image G1 displayed on the monitor 3 as shown in FIG. 4, the operator uses the input unit 4 to designate a rectangular region of interest R0 on the breast M. Thereby, the region specifying unit 2c specifies the region of interest R0 in the radiation image G1 on the breast M.

  The region specifying unit 2c automatically detects abnormal shadow candidates in a radiographic image, and uses a computer-aided image diagnosis system (CAD: Computer Aided Diagnosis) that highlights the detected abnormal shadow candidates. The region of interest R0 may be automatically specified. In addition, AEC (Automatic Exposure Control) is used for photographing the breast in order to obtain an appropriate image density. A portion of the breast M where the breast density is high is detected by the AEC. Radiation is low or has a specific value. Therefore, a portion where the radiation dose detected by the AEC is low or a portion having a specific value may be specified as the region of interest. As a method for detecting an abnormal shadow candidate, for example, image processing using an iris filter is performed on a radiation image of a breast, and the output value is subjected to threshold processing, whereby a tumor shadow (abnormality) that is a form of cancer or the like is detected. A method of automatically detecting a candidate for a shadow (see, for example, Japanese Patent Laid-Open No. 10-97624), image processing using a morphology filter, and thresholding the output value, such as breast cancer There is known a method of automatically detecting candidates for microcalcification shadows (one form of abnormal shadows) which is another form (see, for example, JP-A-8-294479).

  The irradiation field setting unit 2d outputs a control signal for adjusting the aperture to the collimator 22 so that the radiation is irradiated only to the region corresponding to the region of interest R0 specified by the region specifying unit 2c in the breast M. Set the irradiation field. The irradiation field setting unit 2d may automatically adjust the opening of the collimator 22 and set the irradiation field. The irradiation field setting unit 2d adjusts the opening of the collimator 22 by the input from the input unit 4 by the operator. A field may be set. As a result, when the second radiographic image is captured, the radiation is focused and applied to the breast M as shown by the broken line H in FIG.

  The display control unit 2e cuts out an image corresponding to the region of interest R0 from the first radiographic image G1 out of the two radiographic images read out from the radiographic image storage unit 2b, and extracts the image (referred to as GR1). After the predetermined processing is performed on the second radiation image G2, a stereoscopic image of the breast M is displayed on the monitor 3.

  The monitor 3 is configured so that a stereoscopic image can be three-dimensionally displayed using the two radiation images GR1 and G2 output from the computer 2. The monitor 3 can also two-dimensionally display any one of the radiation image G1, the cut-out image GR1, and the radiation image G2. As a three-dimensional display method of the monitor 3, for example, two radiographic images are displayed using two screens, and one of these radiographic images is displayed on the right eye of the observer by using a half mirror, polarizing glass, or the like. It is possible to adopt a method in which a stereoscopic image is displayed by making the other radiation image incident on the left eye of the observer. Alternatively, a method of displaying a stereoscopic image by superimposing two radiographic images and observing them with a polarizing glass may be used. Furthermore, a system in which the monitor 3 is configured by 3D liquid crystal and two radiographic images can be stereoscopically viewed, such as a parallax barrier system and a lenticular system, may be used.

  The input unit 4 is configured by a pointing device such as a keyboard and a mouse, for example, and receives an input of shooting conditions and an input of a shooting start instruction by an operator.

  Next, processing performed in the present embodiment will be described. FIG. 5 is a flowchart showing processing performed in the present embodiment. First, the patient's breast M is placed on the imaging table 14, and the breast M is compressed with a predetermined pressure by the compression plate 18 (step ST1). Then, after various shooting conditions are input at the input unit 4, an instruction to start shooting is input (step ST2).

  When there is an instruction to start imaging in the input unit 4, imaging of the first radiation image G1 of the two radiation images for displaying a stereoscopic image of the breast M is performed (step ST3). Specifically, first, the controller 2 a reads the stored convergence angle θ, and outputs the read information about the convergence angle θ to the arm controller 31. Then, the arm controller 31 receives the information of the convergence angle θ output from the control unit 2a, and the arm controller 31 first has a direction in which the arm unit 13 is perpendicular to the imaging table 14, as indicated by a solid line in FIG. A control signal is output so as to be (0 degree direction).

  Then, in accordance with the control signal output from the arm controller 31, the control unit 2 a controls the radiation source controller 32 and the detector controller 33 in a state where the arm unit 13 is in a direction perpendicular to the imaging table 14. On the other hand, a control signal is output so as to perform radiation irradiation and readout of a radiation image signal. Note that the position of the radiation source 17 in this state is a reference viewpoint position. In response to this control signal, radiation is emitted from the radiation source 17, a radiation image obtained by photographing the breast M from the 0 degree direction is detected by the radiation detector 15, and a radiation image signal is output from the radiation detector 15 by the detector controller 33. After being read out and subjected to predetermined signal processing on the radiation image signal, it is stored in the radiation image storage unit 2b of the computer 2 as a reference radiation image G1.

  Next, the region specifying unit 2c displays the first radiation image G1 on the monitor 3 (step ST4), and accepts the designation of the region of interest R0 from the input unit 4 by the operator (step ST5). Thereby, the region specifying unit 2c specifies R0 as the region of interest (step ST6), and the irradiation field setting unit 2d adjusts the collimator 22 to set the irradiation field (step ST7). Specifically, the irradiation setting unit 2d outputs a control signal for adjusting the opening of the collimator 22, so that the collimator 22 emits radiation only to the region corresponding to the region of interest R0 in the breast M. Adjust the aperture to set the irradiation field.

  Next, the second radiographic image G2 of the two radiographic images constituting the stereoscopic image of the breast M is taken (step ST8). Specifically, the arm controller 31 outputs a control signal so as to rotate the arm unit 13 by + θ degrees with respect to a direction perpendicular to the imaging table 14 as indicated by a virtual line in FIG. Then, in a state where the arm unit 13 is rotated by + θ degrees in accordance with the control signal output from the arm controller 31, the control unit 2a applies radiation to the radiation source controller 32 and the detector controller 33 and the radiation image signal. A control signal is output so as to read out. In response to this control signal, radiation is emitted from the radiation source 17, a radiation image obtained by photographing the breast M from the + θ degree direction is detected by the radiation detector 15, and a radiation image signal is read by the detector controller 33. After the signal processing is performed, it is stored in the radiation image storage unit 2b of the computer 2 as a radiation image G2. The radiation image G2 has a size corresponding to the region of interest R0 set as shown in FIG.

  Then, the two radiographic images G1 and G2 stored in the radiographic image storage unit 2b are read out, and the image of the region of interest R0 is cut out from the radiographic image G1 in the display control unit 2d, and the cut out images GR1 and G2 are cut out. Is subjected to a predetermined process and then output to the monitor 3, and the monitor 3 displays a stereoscopic image of the breast M corresponding to the region of interest R0 (step ST9).

  Thus, according to the present embodiment, after capturing the first radiation image G1, when capturing the second radiation image G2, it corresponds to the region of interest R0 specified in the first radiation image G1. Radiation is applied only to the area. For this reason, it is possible to prevent radiation other than the irradiation field in the breast M, thereby reducing the exposure amount of the breast M at the time of capturing the second radiation image G2. Further, since the radiation is not irradiated onto the breast M simultaneously from a plurality of imaging directions, it is not necessary to prepare a plurality of radiation sources 17, and as a result, the configuration of the radiation image capturing apparatus 1 can be simplified. .

  In the above embodiment, the radiographic image capturing apparatus 1 is used to capture two radiographic images for displaying a stereoscopic image. However, the radiographic image capturing apparatus 1 according to the present embodiment performs tomosynthesis imaging. It is also possible to do this. When performing tomosynthesis imaging, as shown in FIG. 7, a plurality of radiation images are acquired by moving the radiation source 17 and irradiating the breast M with radiation from a plurality of different imaging directions. Then, a plurality of radiographic images are reconstructed to generate a tomographic image in which a desired cross section is emphasized. In this case, the computer 2 includes a reconstruction unit 2f as shown in FIG.

  The reconstruction unit 2f reconstructs a plurality of radiographic images to generate a tomographic image in which a desired cross section of the breast M is emphasized. In the present embodiment, the plurality of radiographic images are the image of the region of interest cut out from the first radiographic image and the second and subsequent radiographic images. Specifically, the reconstruction unit 2f reconstructs these radiation images using a back projection method such as a simple back projection method or a filtered back projection method, and generates a tomographic image.

  When tomosynthesis imaging is performed in this manner, the region of interest is specified using the first radiographic image after imaging the first radiographic image, as in the above embodiment. Then, at the time of taking the second and subsequent radiographic images, after adjusting the opening of the collimator 22 and setting the irradiation field so that the radiation is irradiated only to the region corresponding to the region of interest R0 in the breast M, What is necessary is just to image | photograph the radiation image after eyes. As a result, even when tomosynthesis imaging is performed, the exposure dose of the breast M can be reduced when capturing the second and subsequent radiographic images.

  In the above embodiment, a radiographic image acquired by photographing the breast M from the 0 degree direction is used as a reference radiographic image. However, as two radiographic images for displaying a stereoscopic image, the breast is An image taken from a direction different from 0 degrees may be used as a reference. In this case, a stereoscopic image may be displayed using a radiographic image taken from a direction different from 0 degrees as a reference radiographic image.

  Moreover, in the said embodiment, although the radiographic imaging apparatus of this invention is set as the apparatus which image | photographs the radiographic image of a breast, it is not restricted to a breast as a subject, For example, the radiographic imaging apparatus which image | photographs a chest, a head, etc. It is also possible to use.

DESCRIPTION OF SYMBOLS 1 Radiographic imaging apparatus 2 Computer 2a Control part 2b Radiation image memory | storage part 2c Area | region specific part 2d Irradiation field setting part 2e Display control part 2f Reconstruction part 3 Monitor 4 Input part 10 Imaging part 13 Arm part 14 Imaging stand 15 Radiation detector 16 Radiation irradiation part 17 Radiation source 18 Compression plate 22 Collimator

Claims (8)

Radiation irradiation means for irradiating the subject with radiation;
Radiation detecting means for detecting the radiation irradiated by the radiation irradiating means and transmitted through the subject and outputting a radiation image of the subject;
An imaging control unit that irradiates the subject with the radiation from a plurality of imaging directions, and detects a plurality of radiographic images with different imaging directions due to the irradiation of the radiation by the radiation detection unit;
An irradiation field stop means that is provided between the radiation irradiation means and the subject, and sets an irradiation field of the radiation on the subject;
By the irradiation field stop means, the size of the irradiation field at the time of capturing the second and subsequent radiation images is made smaller than the size of the irradiation field at the time of capturing the first radiation image among the plurality of radiation images. A radiation image photographing apparatus comprising: an irradiation field setting means for performing   After capturing the first radiographic image of the plurality of radiographic images, and before capturing the second radiographic image, further comprising region specifying means for specifying the region of interest of the first radiographic image The radiographic imaging apparatus according to claim 1.   The region specifying means specifies the region of interest based on the first radiographic image after taking the first radiographic image and before taking the second radiographic image. The radiographic image capturing apparatus according to claim 2, wherein the radiographic image capturing apparatus is a means for performing the processing. A display means for displaying at least one of the plurality of radiation images;
The region specifying means displays the first radiographic image on the display means after taking the first radiographic image of the plurality of radiographic images and before taking the second radiographic image, The radiographic image capturing apparatus according to claim 2, wherein the radiographic image capturing apparatus is a unit that identifies the region of interest by receiving designation of the region of interest in the first radiographic image.   The irradiation field setting means is configured to irradiate only the region corresponding to the region of interest in the subject after capturing the first radiation image and capturing the second and subsequent radiation images. The radiographic image capturing apparatus according to claim 2, wherein the radiation field capturing unit is a unit that sets the irradiation field.   The display means is means for cutting out an image of the region of interest from the first radiation image and displaying a stereoscopic image using the image of the region of interest and the second and subsequent radiation images. The radiographic imaging device according to claim 2, wherein   A desired cross-section corresponding to the region of interest of the subject by cutting out the image of the region of interest from the first radiation image and reconstructing the image of the region of interest and the second and subsequent radiation images. 7. The radiographic image capturing apparatus according to claim 2, further comprising a tomographic image generation unit configured to generate a tomographic image. Radiation irradiation means for irradiating the subject with radiation;
Radiation detecting means for detecting the radiation irradiated by the radiation irradiating means and transmitted through the subject and outputting a radiation image of the subject;
An imaging control unit that irradiates the subject with the radiation from a plurality of imaging directions, and detects a plurality of radiographic images with different imaging directions due to the irradiation of the radiation by the radiation detection unit;
A radiographic imaging method in a radiographic imaging device, comprising: an irradiation field stop unit that is provided between the radiation irradiation unit and the subject and sets the radiation field on the subject,
Radiation characterized in that the size of the irradiation field at the time of capturing the second and subsequent radiation images is made smaller than the size of the irradiation field at the time of capturing the first radiation image among the plurality of radiation images. Image shooting method.

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