JP2014068874A - Image display system, radiation imaging system, image display control program and image display control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image display system, a radiation imaging system, an image display control program and an image display control method capable of displaying a set of images suitable for stereoscopic observation.SOLUTION: A radiation image processor 14 obtains a plurality of projection images obtained by tomosynthesis imaging using a radiation imaging apparatus 10, and a tomographic image generation unit 80 reconfigures the projection images to generate a tomographic image. A projection corresponding image generation unit 82 again reconfigures the generated tomographic image to generate a projection corresponding image. An image display control unit 84 controls to display the projection corresponding images and one projection image selected from the plurality of projection images as stereoscopic vision image on a display unit 42 (42R, 42L) of a radiation image reading apparatus 18.

Description

  The present invention relates to an image display system, a radiographic image capturing system, an image display control program, and an image display control method.

  For the purpose of medical diagnosis, a radiation image is captured by a radiation image capturing apparatus by irradiating a subject of a patient who is a patient with radiation. As a radiographic image capturing method, tomosynthesis imaging is known in which a radiation image is captured by irradiating a subject from a plurality of directions, and a tomographic image is generated based on the captured radiographic image.

  In addition, stereo shooting is known as another shooting method. In stereo shooting, radiation is irradiated from a plurality of directions (stereo shooting), and two images are selectively applied and displayed as a left-eye image and a right-eye image from the plurality of captured images. Stereo images can be displayed and stereoscopically viewed.

  A technique for an image used as such a stereoscopic image is disclosed.

  For example, Patent Literature 1 discloses a technique that uses an image obtained by superimposing a projection image and a tomographic image as a stereoscopic image. Patent Document 2 discloses a technique in which a tomographic image generated by tomosynthesis imaging is used as an image for left and right eyes for stereoscopic viewing.

JP 2012-61187 A JP 2012-50605 A

  However, in the above-described conventional technology, there are cases where the observation of the user is hindered by noise or blurring that occurs in the stereoscopic image. For example, since a projection image is generally a radiographic image taken by irradiation with a low dose of radiation, there are cases where a lot of noise is included, and this noise may hinder observation. On the other hand, in the tomographic image, blurring occurs due to movement of the subject, mechanical accuracy of the radiographic imaging apparatus, and reconstruction calculation error, which may hinder observation.

  An object of the present invention is to provide an image display system, a radiographic imaging system, an image display control program, and an image display control method capable of displaying a set of images suitable for stereoscopic observation.

  In order to achieve the above object, an image display system according to the present invention irradiates a subject on a radiographic image detector with radiation from different projection angles from a radiation irradiation unit provided opposite to the radiographic image detector. A plurality of projection images captured at each projection angle by the radiation image detector are acquired from the radiation image detector, and a plurality of reconstructed images based on the acquired plurality of projection images with reference to the detection surface of the radiation image detector A tomographic image generating means for generating a tomographic image, a projection equivalent image generating means for reconstructing a projection equivalent image corresponding to the projected image from a plurality of tomographic images generated by the tomographic image generating means, and one for the right eye and one for the left eye Display means for displaying a set of images and performing stereoscopic viewing so that the projection-corresponding image is one of the set of images and any one of the plurality of projection images is stereoscopically viewable And a control means for Shimesuru control, the.

  The image display system of the present invention further comprises a height setting means for setting the height of the projection equivalent image reconstructed by the projection equivalent image generation means with reference to the detection surface of the radiation image detector, and the projection equivalent image. The generation unit may generate a projection equivalent image corresponding to the height set by the height setting unit.

  The image display system of the present invention further includes a projection angle setting unit that sets a projection angle of a projection equivalent image, and the projection equivalent image generation unit is configured to generate a projection equivalent image based on the projection angle set by the projection angle setting unit. May be generated.

  The image display system of the present invention further includes an observation angle setting unit that sets an observation angle that is a difference between the projection angle of the projection equivalent image and the projection angle of the projection image, and the control unit includes the projection equivalent image, the observation angle, and the like. The display unit may be controlled to display the projection image selected according to the observation angle set by the setting unit as a set of images.

  Further, the control means of the image display system of the present invention displays the projection equivalent image and the projection image selected according to the observation angle predetermined according to the degree of stereoscopic vision as a set of images. The display means may be controlled.

  In addition, the image display system of the present invention includes a projection image setting unit that sets a projection image to be displayed on the display unit, and the control unit combines the projection equivalent image and the projection image set by the projection image setting unit. You may make it control a display means to display as a group of images.

  The image display system of the present invention further includes left and right setting means for setting which of the projection equivalent image and the projection image is for the right eye or the left eye of a set of images, and the control means is a left and right setting means. Based on these settings, the projection equivalent image and the projection image may be controlled to be displayed for the right eye or the left eye of a set of images.

  The radiation image capturing system of the present invention acquires a projection image captured by a radiation image capturing apparatus that detects a radiation irradiated from a radiation irradiating unit by a radiation image detector and captures a projected image, and a radiation image capturing apparatus. The image display system of the present invention and display means for displaying a pair of images for the right eye and the left eye to perform stereoscopic viewing based on control by the image display system.

  The image display control program of the present invention irradiates a subject on a radiographic image detector with radiation from a different projection angle from a radiation irradiation unit provided facing the radiographic image detector, and the projection angle by the radiographic image detector. A tomographic image obtained by acquiring a plurality of projection images taken every time from a radiation image detector and generating a plurality of tomographic images reconstructed with reference to the detection surface of the radiation image detector based on the acquired plurality of projection images A generation unit, a projection equivalent image generation unit that reconstructs a projection equivalent image corresponding to the projection image from a plurality of tomographic images generated by the tomographic image generation unit, and a set of images for the right eye and the left eye Control for controlling the stereoscopic display so that the projection-corresponding image is one of a set of images and any one of the plurality of projection images is stereoscopically displayed on the display unit that performs stereoscopic viewing. As a step, it is intended to cause a computer to function.

  The image display control method of the present invention irradiates a subject on a radiographic image detector with radiation from a different projection angle from a radiation irradiation unit provided facing the radiographic image detector, and the projection angle by the radiographic image detector. A tomographic image obtained by acquiring a plurality of projection images taken every time from a radiation image detector and generating a plurality of tomographic images reconstructed with reference to the detection surface of the radiation image detector based on the acquired plurality of projection images A generation step, a projection equivalent image generation step for reconstructing a projection equivalent image corresponding to the projection image from a plurality of tomographic images generated by the tomographic image generation step, and a set of images for the right eye and the left eye A control step for controlling the display means for performing stereoscopic viewing so that the projection-corresponding image is one of a set of images and any one of the plurality of projected images is stereoscopically displayed as the other; Equipped with a.

  According to the present invention, an effect that a set of images suitable for stereoscopic observation can be displayed is obtained.

It is a schematic block diagram which shows the outline of the whole structure of an example of the radiographic imaging system of this Embodiment. It is a perspective view which shows an example of a structure of the radiographic image interpretation apparatus which concerns on this Embodiment. It is the schematic for demonstrating the structure of the polarized glasses of the radiographic image interpretation apparatus which concerns on this Embodiment, and the stereoscopic vision by polarized glasses. It is a schematic block diagram which shows an example of a structure of the radiographic imaging apparatus of this Embodiment. It is a block diagram which shows an example of the structure at the time of imaging | photography of the radiographic imaging apparatus of this Embodiment. It is explanatory drawing for demonstrating at the time of imaging | photography of the radiographic imaging apparatus of this Embodiment. It is a block diagram which shows an example of the structure centering on the image display control processing function of the radiographic image processing apparatus of this Embodiment. It is a flowchart which shows an example of the flow of the image display control process performed with the radiographic image processing apparatus of this Embodiment. It is a flowchart of an example of the setting process performed by the image display control process of this Embodiment. It is explanatory drawing for demonstrating the setting of the slab thickness of the projection equivalent image in the setting process of this Embodiment. It is a flowchart of an example of the projection equivalent image generation process performed by the image display control process of this Embodiment. It is a flowchart of an example of the projection image selection process performed by the image display control process of this Embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that this embodiment does not limit the present invention.

  First, a schematic configuration of the entire radiographic image capturing system according to the present embodiment will be described. FIG. 1 shows a schematic configuration diagram of an example of the overall configuration of the radiographic imaging system of the present exemplary embodiment.

  The radiographic imaging system 1 according to the present embodiment is based on an instruction (imaging menu) input from an external system (for example, RIS: Radiology Information System) via the console 16, and a doctor or a radiographer. It has a function of taking a radiographic image by an operation such as the above. In the present embodiment, a doctor or the like, a person who performs observation, examination, diagnosis, etc. of an object of interest such as a calcification, a tumor, and a mammary gland by a radiographic image, a radiation technician, an operator, etc. Called. In addition, a lesion site or tissue such as calcification or a tumor, which is a target of user observation, medical examination, diagnosis, or the like is referred to as an “interest of interest”. Note that the object of interest may be other than a human tissue (for example, a marker or the like). In the present embodiment, the projection image, the tomographic image, and the projection equivalent image (all of which will be described later in detail) captured by the radiation image capturing apparatus 10 are collectively referred to as “radiation image”.

  The radiographic imaging system 1 of the present embodiment has a function of causing a doctor, a radiographer, or the like to interpret a radiographic image by displaying the radiographic image on the display 50 of the console 16 or the radiographic image interpretation device 18. is there.

  The radiographic image capturing system 1 according to the present embodiment includes a radiographic image capturing device 10, a radiation generating device 12, a radiographic image processing device 14, a console 16, a storage unit 17, a radiographic image interpretation device 18, and an electronic cassette 20. .

  The radiation generator 12 includes a radiation irradiation control unit 22. The radiation irradiation control unit 22 receives the radiation X from the radiation irradiation unit 28 based on the control of the radiation control unit 62 of the radiation image processing apparatus 14 (the breast N in FIG. ).

  The radiation X that has passed through the subject W is applied to the electronic cassette 20 held in the imaging table 32. The electronic cassette 20 has a function of generating charges according to the dose of the radiation X transmitted through the subject W, generating image information indicating a radiation image based on the generated charge amount, and outputting the image information.

  In the present embodiment, image information indicating a radiographic image output from the electronic cassette 20 is input to the console 16 via the radiographic image processing device 14. The console 16 of the present embodiment uses a radiographic imaging apparatus 10, a radiation generation apparatus, using an imaging menu or various information acquired from an external system (RIS) or the like via wireless communication (LAN: Local Area Network) or the like. 12 and the function of controlling the electronic cassette 20. In addition, the console 16 according to the present embodiment has a function of transmitting and receiving various types of information including image information of radiographic images to and from the radiographic image processing device 14.

  The console 16 according to the present embodiment is configured as a server computer, and includes a control unit 24, a display driver 26, a display 50, an operation input detection unit 52, an operation panel 54, an I / O unit 56, and an I / F unit 57. , And an I / F unit 58. The control unit 24, the display driver 26, the operation input detection unit 52, and the I / O unit 56 are connected to each other via a bus 59 such as a system bus or a control bus so that information can be exchanged.

  The control unit 24 has a function of controlling the operation of the console 16 as a whole, and includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and an HDD (Hard Disk Drive). ing. The CPU has a function of controlling the operation of the entire console 16, and various programs including a control program used by the CPU are stored in advance in the ROM. The RAM has a function of temporarily storing various data, and the HDD (hard disk drive) has a function of storing and holding various data.

  The display driver 26 has a function of controlling display of various information on the display 50. The display 50 according to the present embodiment has a function of displaying an imaging menu, a radiation image, and the like. The operation input detection unit 52 has a function of detecting an operation state with respect to the operation panel 54. The operation panel 54 is used by the user to input operation instructions relating to radiographic image capturing. In the present embodiment, the operation panel 54 includes, for example, a touch panel, a touch pen, a plurality of keys, a mouse, and the like.

  Further, the I / O unit 56 and the I / F unit 58 communicate various information and images with the radiographic image capturing device 10, the radiation generating device 12, and the electronic cassette 20 via the radiographic image processing device 14 by wireless communication. It has a function to send and receive information and the like. The I / F unit 57 has a function of transmitting / receiving various types of information to / from the RIS.

  The radiographic image processing apparatus 14 of the present exemplary embodiment includes a system control unit 60, a radiation control unit 62, a panel control unit 64, an image processing control unit 66, an I / F unit 67, and an imaging control unit 68.

  The system control unit 60 has a function of controlling the entire radiation image processing apparatus 14 and a function of controlling the radiation image capturing system 1. The radiation control unit 62 has a function of controlling the radiation irradiation control unit 22 of the radiation generator 12 based on an instruction from the console 16 or the like. The panel control unit 64 has a function of controlling the electronic cassette 20 based on an instruction from the console 16 or the like. The image processing control unit 66 has a function of performing various image processing on the radiation image. The imaging control unit 68 has a function of controlling the radiation image capturing apparatus 10 based on an instruction from the console 16 or the like. The system control unit 60, the radiation control unit 62, the panel control unit 64, the image processing control unit 66, and the imaging control unit 68 are connected so as to be able to exchange information and the like via a bus 69 such as a system bus or a control bus. Has been.

  The storage unit 17 of the present embodiment has a function of storing a captured radiographic image and information related to the radiographic image. An example of the storage unit 17 is an HDD.

  Moreover, the radiographic image interpretation apparatus 18 of this Embodiment is an apparatus which has a function for a user to interpret the image | photographed radiographic image by stereoscopic vision. The radiographic image interpretation apparatus 18 of this embodiment is configured as a personal computer, and, like the console 16 and the radiographic image processing apparatus 14, a CPU, ROM, RAM, HDD, display driver, display unit 42, operation input, and so on. A detection unit, an operation unit 40, an I / O unit, and an I / F unit are provided. In FIG. 1, only the display unit 42 and the operation unit 40 are shown in these configurations, and other descriptions are omitted to avoid complicated description.

  FIG. 2 is a perspective view showing an example of the configuration of the radiographic image interpretation apparatus 18 according to the present embodiment. As shown in FIG. 2, in the radiographic image interpretation apparatus 18, two display units 42 are arranged vertically, and the display unit 42 is tilted forward and fixed on the upper side. In the two display sections 42, the upper display section 42 is a display section 42R that displays an image for the right eye, and the lower display section 42 is a display section 42L that mainly displays an image for the left eye.

  In the radiological image interpretation apparatus 18 according to the present embodiment, the resolution of the display unit 42L is set to a predetermined resolution that is required according to the application and the like, while the resolution of the display unit 42R is lower than that of the display unit 42L. Has been. Thereby, compared with the case where the resolution of the display part 42R is made the same as the display part 42L, the cost of the radiographic image interpretation apparatus 18 can be reduced.

  Between the display unit 42L and the display unit 42R, a plane-shaped rectangular beam splitter, which transmits the display light from the display unit 42L and reflects the display light from the display unit 42R. A mirror 44 is provided. In the radiological image interpretation apparatus 18 according to the present embodiment, the beam splitter mirror 44 is rotated at the end of the display unit 42R on the side fixed to the display unit 42L via the hinge 46. It is installed so as to be rotatable in the direction of arrow A in FIG.

  The beam splitter mirror 44 according to the present embodiment is based on a half-mirror as a base and a predetermined polarization direction (horizontal in the present embodiment) on the surface of the display section 42L of the half mirror. Direction), a polarization film 44A for polarizing incident light is attached to the surface on the display surface side of the display section 42R. The direction is perpendicular to the predetermined polarization direction (in this embodiment, the vertical direction). A polarizing film 44B for polarizing incident light is attached to the substrate.

  In the radiological image interpretation apparatus 18 according to the present embodiment, the rotation range of the beam splitter / mirror 44 is an image displayed on the display unit 42L when the user views the radiographic image interpretation apparatus 18 from the front. On the side where the polarization film 44B of the beam splitter mirror 44 is attached, and the fully opened position (position shown in FIG. 2) whose angle is adjusted so that the image displayed on the display unit 42R and the image displayed on the display unit 42R overlap. The surface is limited to a range between the fully closed position where the surface overlaps the display surface of the display unit 42R.

  FIG. 3 is a schematic diagram for explaining the configuration of the polarized glasses of the radiological image interpretation apparatus 18 according to the present embodiment and the stereoscopic view using the polarized glasses. As shown in FIG. 3, the user positions the beam splitter mirror 44 in the fully open position, displays the left-eye image on the display unit 42L, and displays the right-eye image on the display unit 42R. By referring to the beam splitter mirror 44 through polarization glasses 48 whose polarization directions are orthogonal to each other between the lens and the left lens, an image for the left eye displayed on the display unit 42L with the left eye and the right eye The right-eye image displayed on the display unit 42R can be viewed separately, and as a result, a stereoscopic image can be viewed.

  The radiographic image interpretation device 18 is not limited to this as long as it can perform three-dimensional display (stereoscopic view) using a set of radiographic images for the right eye and the left eye. For example, a method of displaying a stereoscopic image by superimposing a set of images and observing the images with polarized glasses may be used. Further, for example, the display unit 42 may be configured by 3D liquid crystal, and a stereoscopically visible method such as a parallax barrier method and a lenticular method may be used.

  In the present embodiment, the projection image and the projection equivalent image are a set of images for the right eye and the left eye. Hereinafter, a set of images for the right eye and the left eye are referred to as “stereoscopic images”.

  Next, the configuration of the radiation image capturing apparatus 10 of the present embodiment will be described in detail. FIG. 4 shows a schematic configuration diagram of an example of the configuration of the radiographic image capturing apparatus 10 of the present exemplary embodiment. Further, FIG. 5 shows a configuration diagram of an example of a configuration at the time of imaging of the radiographic image capturing apparatus 10 of the present exemplary embodiment. FIG. 6 is an explanatory diagram for explaining the radiographic imaging apparatus 10 of the present embodiment at the time of imaging.

  As shown in FIGS. 4 to 6, the radiographic imaging device 10 of the present exemplary embodiment applies radiation (for example, X-rays) to the breast N of the subject W while the subject W is standing. For example, called mammography. In the following, the near side near the subject W when the subject W faces the radiographic imaging device 10 at the time of radiography is referred to as the front side of the radiographic imaging device 10, and the radiographic imaging device 10 The far side away from the subject W when the subject W faces is the rear side of the radiographic imaging device 10. Further, the left-right direction of the subject W when the subject W faces the radiographic image capturing apparatus 10 will be described as the left-right direction of the radiographic image capturing apparatus 10 (see arrows in FIGS. 4 to 6).

  As shown in FIG. 4, the radiographic image capturing apparatus 10 includes a measurement unit 70 having a substantially C-shape in a side view provided on the front side of the apparatus, and a base unit 72 that supports the measurement unit 70 from the rear side of the apparatus. ing.

  The measuring unit 70 compresses the breast N between the imaging surface 32 on which the planar imaging surface 34 that comes into contact with the breast N of the subject W in the standing position is formed and the imaging surface 34 of the imaging table 32. And a holding portion 76 that supports the imaging table 32 and the compression plate 36.

  The measurement unit 70 is provided with a radiation source 30 such as a tube, and the radiation irradiation unit 28 that irradiates inspection radiation from the radiation source 30 toward the imaging surface 34 and the holding unit 76 are separated from each other. And a support portion 77 that supports the portion 28.

  The measuring unit 70 is provided with a rotating shaft 74 that is rotatably supported by the base unit 72. The rotation shaft 74 is fixed with respect to the support portion 77, and the rotation shaft 74 and the support portion 77 rotate integrally.

  The holding portion 76 can be switched between a state in which the rotation shaft 74 is connected to rotate integrally and a state in which the rotation shaft 74 is separated and idles. Specifically, gears are provided on the rotation shaft 74 and the holding portion 76, respectively, and the meshing state and the non-meshing state of the gears are switched. Note that various mechanical elements can be used for switching between transmission and non-transmission of the rotational force of the rotating shaft 74.

  The holding unit 76 supports the imaging table 32 and the radiation irradiation unit 28 so that the imaging surface 34 and the radiation irradiation unit 28 are separated from each other by a predetermined distance, and the interval between the compression plate 36 and the imaging surface 34 is variable. The compression plate 36 is slidably held.

  The imaging surface 34 with which the breast N abuts is made of, for example, carbon from the viewpoint of radiolucency and strength. Inside the imaging stand 32, an electronic cassette 20 that is irradiated with radiation passing through the breast N and the imaging surface 34 and detects the radiation is disposed. The radiation detected by the electronic cassette 20 is visualized to generate a radiation image. The electronic cassette 20 receives the irradiation of the radiation carrying the image information, records the image information, and outputs the recorded image information. The electronic cassette 20 generates the charge for each pixel generated according to the dose of the irradiated radiation. The radiation detector which detects as is provided. The electronic cassette 20 is configured as, for example, an FPD (Flat Panel Detector) that arranges a radiation sensitive layer, converts radiation into digital data, and outputs the digital data.

  The radiographic image capturing apparatus 10 of the present embodiment is an apparatus that can perform imaging from a plurality of directions at least on the breast N as a subject. 5 and 6 respectively show the posture of the radiographic image capturing apparatus 10 at the time of imaging and the position of the radiation irradiation unit 28 at the time of imaging. As shown in FIGS. 5 and 6, the photographing is performed by tilting the support portion 77.

  In the radiographic imaging device 10, as shown in FIG. 6, when imaging (tomosynthesis imaging) is performed with respect to the breast N from a plurality of directions, the rotation shaft 74 idles with respect to the holding unit 76 and the imaging platform 32. When the compression plate 36 does not move and the support portion 77 rotates, only the radiation irradiation portion 28 moves in an arc shape. In the present embodiment, as shown in FIG. 6, the imaging position is moved from the angle α by a predetermined angle θ, and imaging is performed at N positions where the radiation irradiation unit 28 is P1 to PN.

  Next, a function of performing an image display control process in the radiation image processing apparatus 14 of the present embodiment will be described. FIG. 7 shows a block diagram of an example of a structure centering on the image display control processing function of the radiation image processing apparatus 14.

  The radiation image processing apparatus 14 includes a system control unit 60, a radiation control unit 62, a panel control unit 64, an image processing control unit 66, an I / F unit 67, an imaging control unit 68, a tomographic image generation unit 80, and a projection equivalent image generation unit. 82, an image display setting unit 85, and a storage unit 86. These are connected to each other via a bus 69 such as a control bus or a data bus so that information can be exchanged.

  The system control unit 60 has a function of controlling the overall operation of the radiation image processing apparatus 14 and includes a CPU 90, a ROM 92, a RAM 94, and an HDD 96. Specifically, the CPU 90 controls the entire radiation image processing apparatus 14 by executing a program stored in the ROM 92. In the present embodiment, the program is stored in the ROM 92 in advance. However, the present invention is not limited to this. The program is stored in a recording medium such as a CD-ROM or a removable disk, and the ROM 92 or the like is recorded from the recording medium. You may make it install in. Further, it may be installed in the ROM 92 or the like from an external device via a communication line such as the Internet. The RAM 94 secures a working area when the CPU 90 executes the program. The HDD 96 stores and holds various data.

  When the radiation control unit 62 receives an irradiation instruction from the console 16 or the like via the I / F unit 67, the radiation source provided in the radiation irradiation unit 28 according to the imaging menu set based on the specified exposure condition. Radiation is irradiated from 30 to the imaging surface 34. The exposure conditions received via the I / F unit 67 include tube voltage, tube current, irradiation time, posture information, and the like. The posture information includes information representing a photographing position (photographing posture, angle) when photographing the breast N from a plurality of directions.

  These exposure conditions and posture information may be set by the user from the console 16 or the like, or may be obtained from another control device (RIS) or the like, or the storage unit 86 or the like in advance. You may memorize it.

  Upon receiving the setting of various information, the radiation control unit 62 irradiates the X-rayed region (breast N) of the subject W with the radiation X from the radiation irradiating unit 28 according to the imaging menu based on the set various information. Perform image capture. When imaging from a plurality of directions, the imaging control unit 68 adjusts the posture of the holding unit 76 so that the imaging surface 34 faces upward, and the radiation irradiation unit 28 is positioned above the imaging surface 34. The posture of the support part 77 is adjusted to the state to be performed. When tomosynthesis imaging is performed, the imaging control unit 68 and the radiation control unit 62 rotate the support unit 77 to move the radiation irradiation unit 28 in an arc shape from the angle α to the angle θ as shown in FIG. Based on the imaging conditions, the radiation X is individually applied to the imaging surface 34 from the radiation source 30 provided in the radiation irradiation unit 28 at different projection angles. The panel control unit 64 drives the electronic cassette 20 according to the shooting menu. When the electronic cassette 20 is irradiated with the radiation X, the electronic cassette 20 outputs image information indicating a radiation image (projected image) to the radiation image processing apparatus 14 via the panel control unit 64. In the present embodiment, the electronic cassette 20 receives the radiation transmitted through the breast N, and image information indicating N projected images is obtained. In the present embodiment, the radiation image obtained by tomosynthesis imaging in this way is referred to as a “projection image”.

  The tomographic image generation unit 80 has a function of reconstructing a tomographic image from a plurality of projection images obtained by tomosynthesis imaging and generating a tomographic image parallel to the imaging surface 34. In this embodiment, “parallel” is used, but it also includes substantially parallel.

  The tomographic image generation unit 80 generates a tomographic image from a plurality of radiographic images captured at the positions P1, P2, P3,. The position at which the object of interest is projected onto the projection image differs depending on the imaging angle (projection angle) at which the radiation source 30 emits radiation from each position. Therefore, the tomographic image generation unit 80 acquires imaging conditions when the projection image is captured from the radiographic image capturing apparatus 10, and based on the imaging angles (projection angles) included in the imaging conditions, The amount of movement of the object of interest is calculated and a tomographic image is reconstructed based on a known reconstruction method.

  The projection equivalent image generation unit 82 has a function of reconstructing a projection equivalent image from the tomographic image generated by the tomographic image generation unit 80 and generating a pseudo two-dimensional image. In the present embodiment, the pseudo two-dimensional image radiation image reconstructed from the tomographic image in this way corresponds to the projection image, and is referred to as a “projection equivalent image”.

  The method for reconstructing a projection equivalent image (pseudo two-dimensional image) from the tomographic image is not particularly limited, and for example, a technique described in US Publication No. 2010-0135558 may be used.

  The image display setting unit 85 has a function for allowing the user to perform various settings (details will be described later) related to the stereoscopic image displayed on the radiation image interpretation apparatus 18. The image display setting unit 85 displays a setting screen (not shown) for performing various settings on the display unit 42 of the radiation image interpretation apparatus 18 via the I / F unit 67, and according to the display. It has a function of accepting and setting parameters designated by the user using the operation unit 40.

  The storage unit 86 is for storing various types of information, such as a so-called large-capacity hard disk. In the present embodiment, the projection image acquired from the radiographic image capturing apparatus 10, the tomographic image generated by the tomographic image generation unit 80, the projection equivalent image generated by the projection equivalent image generation unit 82, and the like are temporarily stored. .

  The image display control unit 84 has a function of controlling display of an image via the I / F unit 67 with respect to the display unit 42 of the radiographic image interpretation apparatus 18. The image display control unit 84 of the present embodiment controls the display unit 42 (42R, 42L) to display the projection image and the projection equivalent image as the stereoscopic image.

  Next, the operation of the radiation image capturing system 1 of the present embodiment will be described with reference to the drawings.

  First, radiographic image capturing in the radiographic image capturing apparatus 10 of the present exemplary embodiment will be described. When radiographic image capturing is performed, the radiographic image capturing apparatus 10 performs capturing according to a capturing menu.

  The radiographic image capturing apparatus 10 adjusts the posture of the holding unit 76 so that the imaging surface 34 faces upward when the imaging instruction of CC (Cranio & Caudal: head-to-tail direction) imaging is input, and the radiation irradiation unit 28. The posture of the support portion 77 is adjusted so as to be positioned above the imaging surface 34. Further, when MLO (Media-Oblique: inside / outside oblique direction) photographing is instructed, the posture of the holding unit 76 is adjusted in a state where the photographing surface 32 is inclined by rotating the photographing table 32 by a predetermined angle.

  The subject W brings the breast N into contact with the imaging surface 34 of the radiographic imaging device 10. In the radiation image capturing apparatus 10, when an operation instruction to start compression is given from the user in this state, the compression plate 36 moves toward the imaging surface 34.

  In this state, the radiographic image capturing apparatus 10 according to the present embodiment rotates the support unit 77 only when radiation instructions for performing tomosynthesis imaging for imaging from a plurality of directions are input to the breast N. As shown in FIG. 6, the irradiation unit 28 is moved in an arc shape, and the imaging position is moved from the angle α by a predetermined angle θ, so that the radiation irradiation unit 28 is positioned at N positions P1 to PN according to the imaging conditions. Based on the radiation. The radiation individually irradiated from the radiation irradiation unit 28 passes through the breast N and reaches the electronic cassette 20.

  When the electronic cassette 20 is irradiated with radiation, the electronic cassette 20 outputs image information indicating the irradiated radiation image (projected image) to the panel control unit 64. As described above, when radiation irradiation is performed at N positions P1 to PN of the radiation irradiation unit 28, image information of N projection images is output to the panel control unit 64.

  In the radiographic image processing device 14, the projection image input from the radiographic image capturing device 10 and the projection equivalent image reconstructed from the tomographic image reconstructed from the projection image can be stereoscopically viewed on the display unit 42 of the radiographic image interpretation device 18. An image display control process to be displayed is performed.

  Next, the image display control process will be described in detail. FIG. 8 shows a flowchart of an example of the flow of the image display control process executed by the radiation image processing apparatus 14 of the present embodiment.

  In step S100, it is determined whether various settings relating to image display are to be performed. When the user makes various settings related to the image display of stereoscopic use, the process proceeds to step S102 and proceeds to step S114 after performing the setting process.

  FIG. 9 shows a flowchart of an example of the setting process performed in step S102. The setting process of the present embodiment includes setting of the slab thickness of the projection equivalent image, setting of the left and right stereoscopic images to be displayed on the radiation image interpretation device 18, setting of the projection angle when generating the projection equivalent image, And any one of four types of setting of the observation angle are set. In the present embodiment, the angle that the projection equivalent image generation unit 82 considers to have been irradiated with the radiation X when the projection equivalent image is reconstructed is referred to as a “projection angle”, as in the case of shooting the projection image. Further, in the present embodiment, the difference between the projection angle of the projection image that is a stereoscopic image and the projection angle of the projection equivalent image is referred to as an “observation angle”.

  Therefore, step S202 to step S206 after affirmation in step S200 of the flowchart shown in FIG. 9 is a slab thickness setting process. Further, step S210 after affirmative determination in step 208 is a process for setting the left and right of the stereoscopic image. Further, Steps S216 to S222 after affirmation in Step S212 is a projection angle setting process. Further, Step S224 to Step S230 after the negative in Step S212 is an observation angle setting process. The parameters set by these setting processes are stored in the storage unit (not shown) of the image display setting unit 85, the storage unit 86, and the like. In the following, each process will be described in sequence according to the flowchart shown in FIG.

  In step S200, it is determined whether or not the setting performed by the user is a slab thickness setting. As for which setting is to be performed, the image display setting unit 85 receives a user instruction using the operation unit 40 of the radiographic image interpretation apparatus 18 via the I / F unit 67.

  When setting the slab thickness, the determination is affirmed and the process proceeds to step S202. In step S202, the image display setting unit 85 instructs to generate a horizontal image of the subject (breast N) and display it on the display unit 42 of the radiographic image interpretation device 18. Here, the landscape image refers to an image corresponding to a radiographic image captured when radiation X is applied to the breast N from a direction intersecting the imaging angle (projection angle) (see the horizontal direction in FIG. 5). Say. When the radiographic image capturing apparatus 10 captures a landscape image, the captured radiographic image is displayed on the display unit 42 of the radiographic image interpretation apparatus 18. On the other hand, if the image is not captured, a pseudo lateral image is generated using a known method based on the projection image or the tomographic image generated by the tomographic image generation unit 80, and It is displayed on the display unit 42. In addition, since the display here does not need to make it stereoscopically view, what is necessary is just to display the same image on both the display parts 42R and 42L. Note that the display method is not limited to this, and the display method may be displayed on only one of the display units 42R and 42L.

  A specific example of the landscape image displayed on the display unit 42 is shown in FIG. The horizontal image of FIG. 10 shows a state in which a metal marker image (marker image) MG used by the user for observation is included in the image of the breast image NG. Moreover, the dotted line in FIG. 10 has shown slab thickness.

  Based on the display shown as a specific example in FIG. 10, the user performs designation using the operation unit 40. For example, the range of the slab thickness is designated with a mouse or a touch pen (see arrow B in FIG. 10). For example, as shown in FIG. 10, stereoscopic observation may be hindered by the presence of the marker image MG or the like. In addition, the marker image MG or an image such as a tumor may interfere with observation of an image (tissue) below the marker image MG. In such a case, by designating a range that does not include the marker image MG as the slab thickness, the marker image MG can be removed from the projection equivalent image, and the user's stereoscopic observation becomes easy. In such a case, since the projected image of the stereoscopic image includes the marker image MG, the marker image MG is visible to the left or right eye of the user, but the other eye is visible. Cannot see the marker image MG. Therefore, the marker image MG is not stereoscopically viewed, and does not hinder the user's stereoscopic viewing.

  When the user designates the slab thickness in this way, the designation is accepted in the next step S204.

  In the next step S206, after determining the slab thickness based on the accepted designation, this process is terminated. In this embodiment, when no designation is received from the user, the slab thickness is set to the full thickness (synonymous with the full range designation) as an initial value.

  On the other hand, if negative in step S200, the process proceeds to step S208. In step S208, it is determined whether or not the setting performed by the user is a setting process for left and right stereoscopic images.

  When setting the left and right of the stereoscopic image, the determination is affirmed and the process proceeds to step S208. In the present embodiment, the user can designate which of the projected image, which is a stereoscopic image, and the projected equivalent image is to be the right-eye image or the left-eye image. The designation may be specified in advance by the user before displaying the stereoscopic image, or may be appropriately specified by the user during observation of the stereoscopic image. When the user designates the left-eye image and the right-eye image in this way, in the next step S210, after accepting the designation, the process is terminated.

  On the other hand, if negative in step S208, the process proceeds to step S212. In step S212, it is determined whether or not the setting performed by the user is a projection angle setting process.

  When the projection angle setting process is performed, the determination is affirmed and the process proceeds to step S214. In step S214, it is determined whether or not the user designates the projection angle itself. When the user designates the projection angle itself, the determination is affirmed and the process proceeds to step S216. The user designates a projection angle using the operation unit 40. Therefore, in the next step S216, after accepting the projection angle designated by the user, this process is terminated.

  On the other hand, when the result in Step S214 is negative, the process proceeds to Step S218, and a plurality of projection images acquired from the radiation image capturing apparatus 10 are displayed on the display unit 42. A plurality of projected images may be sequentially displayed on the display unit 42 or may be displayed simultaneously. The user uses the operation unit 40 to select a projection image. Therefore, in the next step S220, after accepting the projection image selected by the user, the process proceeds to step S222.

  In the present embodiment, when a stereoscopic projection image is selected in this manner, in step S22, after determining the projection angle of the projection equivalent image suitable for stereoscopic vision on the basis of the projection image, The process ends. In the present embodiment, when the observation angle is set as the projection angle of the projection equivalent image, the received projection image projection angle + observation angle is determined as the projection angle of the projection equivalent image. On the other hand, when the observation angle is not set, the projection angle +4 degrees of the received projection image or the projection angle -4 degrees of the received projection image is determined as the projection angle of the projection equivalent image. In general, it is said that stereoscopic viewing can be appropriately performed by setting the observation angle in a range of ± 4 degrees to ± 6 degrees. Therefore, in this embodiment, when the observation angle is not set, the observation angle is set to +4 degrees or −4 degrees as an initial value. By setting the initial value in this way, the stereoscopic depth can be stabilized. Note that this may be set in advance according to the specifications of the display unit 42, user preferences, and the like.

  On the other hand, if the result in Step S212 is negative, the process proceeds to Step S224 in order to perform observation angle setting processing. In step S224, it is determined whether a projection equivalent image has already been displayed on the display unit 42 (one of the display units 42R and 42L). Here, in the case where the stereoscopic image is already displayed on the display unit 42 or the projection equivalent image generated by the projection equivalent image generation unit 82 for the user to set the observation angle is displayed on the display unit 42. It is affirmed when it is displayed on. If the projection equivalent image is not displayed, the determination is negative and the process proceeds to step S226. After setting the observation angle designated by the user using the operation unit 40, the present process is terminated. Since the user can set the observation angle in this way, the user can adjust the depth of stereoscopic vision.

  On the other hand, if the determination in step S224 is affirmative, the process proceeds to step S228. In step S228, a plurality of projection images acquired from the radiation image capturing apparatus 10 are sequentially displayed on the display unit 42 (display unit 42R or 42L) on which no projection equivalent image is displayed. By sequentially displaying the projected images in this way, the user can select the projected image while performing the stereoscopic view, and thus can easily adjust the depth of the stereoscopic view. Thus, when the user selects a projection image, in the next step S230, the selection of the projection image is accepted, and then this process is terminated.

  On the other hand, when such various setting processes are not performed, the determination in step S100 of the image display control process is negative, and the process proceeds to step S104.

  In step S104, the tomographic image generation unit 80 generates a tomographic image. The image information of the projection image acquired from the electronic cassette 20 via the panel control unit 64 is temporarily stored in the storage unit 86. As described above, the tomographic image generation unit 80 reconstructs a tomographic image with a predetermined slab thickness based on a known reconstruction method. The plurality of generated tomographic images are temporarily stored in the storage unit 86.

  In the next step S106, a projection equivalent image generation process is performed to generate a projection equivalent image. FIG. 11 shows a flowchart of an example of the projection image generation process performed in step S106.

  In step S300, it is determined whether a projection angle is set. When the projection angle of the projection equivalent image has been set by the setting process described above, the determination is affirmed and the process proceeds to step S302. After the set projection angle is acquired, the process proceeds to step S306. On the other hand, if it is not set, the result is negative and the process proceeds to step S304. After the projection angle is set to the initial value (0 degrees in the present embodiment), the process proceeds to step S306.

  In step S306, it is determined whether there is a slab thickness setting. When the slab thickness is set by the setting process described above, the determination is affirmed and the process proceeds to step S308, and after the set slab thickness is acquired, the process proceeds to step S312. On the other hand, if it is not set, the result is negative and the process proceeds to step S310. After the slab thickness is set to the initial value (full thickness in the present embodiment), the process proceeds to step S312.

  In step S312, the projection equivalent image generation unit 82 generates a projection equivalent image according to the projection angle and the slab thickness, and then the process ends. As described above, the projection equivalent image generation unit 82 uses the tomographic image stored in the storage unit 86 to generate the projection equivalent image at the projection angle and slab thickness acquired above based on a known re-configuration method. Re-configure. The generated projection equivalent image is temporarily stored in the storage unit 86 as a stereoscopic image.

  When a projection equivalent image is generated in this way, in the next step S108, a projection image selection process is performed, and a projection image to be used as a stereoscopic image is selected from a plurality of projection images acquired from the radiation image capturing apparatus 10. To do. FIG. 12 shows a flowchart of an example of the projection image selection process performed in step S108.

  In step S400, it is determined whether there is a setting relating to the projection image. If the setting related to the projection image has not been set by the setting process described above, the determination is negative and the process proceeds to step S402, and the projection image whose observation angle is the initial value (+4 degrees or -4 degrees in the present embodiment) is selected. Then, this process is terminated. When there is no projection image corresponding to the initial value, the projection image whose observation angle is closest to the initial value is selected. By selecting in this way, in this embodiment, the depth of stereoscopic vision can be stabilized.

  On the other hand, if there is a setting related to the projection image, the determination is affirmed and the process proceeds to step S404. In step S404, it is determined whether the set image is the projection image itself or the observation angle. When step S220 or step S230 of the setting process described above is executed, a projection image is set, and the process proceeds to step S406. In step S406, the set projection image (received in step S220 or step S230 described above) is selected, and then the process ends.

  On the other hand, when step S226 of the setting process described above is executed, the observation angle is set, and thus the process proceeds to step S408. In step S408, after selecting a projection image corresponding to the set observation angle (accepted in step S226 described above), the present process ends.

  When the projection image is selected in this way, in the next step S110, the image display control unit 84 controls the display unit 42 of the radiation image interpretation apparatus 18 to display the projection equivalent image and the projection image. At this time, when the left and right settings of the stereoscopic image are set by the setting process described above, control is performed so that the image is displayed based on the settings. On the other hand, if it is not set, the display is controlled based on the initial setting.

  Thereby, the user who interprets the radiographic image interpretation device 18 can appropriately perform stereoscopic observation.

  In the next step S112, it is determined whether or not there is a setting change. For example, when the user wants to change the depth feeling, the setting is changed, so that the determination is affirmed and the process proceeds to step S102, and the above setting process is performed. On the other hand, if the setting has not been changed, the determination is negative and the process proceeds to step S114.

  In step S114, it is determined whether or not to end this process. If not, the determination is negative and the process returns to step S100 to repeat this process. On the other hand, if the process is to be ended, the determination is affirmed and this process is ended.

  As described above, in the present embodiment, the radiographic image processing device 14 acquires a plurality of projection images obtained by tomosynthesis imaging by the radiographic image capturing device 10, and the tomographic image generation unit 80 reconstructs the projection images. To generate a tomographic image. The projection equivalent image generation unit 82 reconstructs the generated tomographic image again and generates a projection equivalent image. The image display control unit 84 displays the projection equivalent image and one projection image selected from the plurality of projection images on the display unit 42 (42R, 42L) of the radiological image interpretation apparatus 18 as a stereoscopic image. Control as follows.

  In general, in observing a radiographic image, blur is obstructed when observing a fine shape, and noise is obstructed when observing a weak density change. When observing a radiographic image when the subject is a breast, since it is necessary to observe a lesion (a fine shape or a weak density change) such as a minute calcification or a tumor, noise and blur are particularly likely to hinder observation.

  In general, a projection image is a radiographic image taken by irradiation with a low dose of radiation, and thus may contain a lot of noise. On the other hand, the tomographic image may be blurred due to the movement of the subject, the mechanical accuracy of the radiation image capturing apparatus, and the reconstruction calculation error.

  On the other hand, since the projection equivalent image is generally reconstructed from the tomographic image, image information of a plurality of projection images that are the basis of the tomographic image is used, and as a result, noise is reduced. On the other hand, in the imaging and re-reconstruction process of a plurality of projection images, blur due to movement of the subject (breast N), mechanical accuracy of the radiation image capturing apparatus 10, and re-reconstruction calculation error may occur.

  In the present embodiment, since a projection image with less blur and a projection equivalent image with less noise are used as a stereoscopic image, compared to the case where only one or both of the projection image and the tomographic image are used, It is possible to reduce noise and blurring from obstructing stereoscopic observation.

  Therefore, in this embodiment, a set of images suitable for stereoscopic observation can be displayed. Thereby, the user who performs stereoscopic vision observation can perform observation more accurately and quickly.

  Further, in the present embodiment, the image display setting unit 85 can adjust (set) the sense of depth when the user performs stereoscopic viewing, so that observation can be performed more accurately and quickly.

  Furthermore, in this embodiment, since observation can be performed more accurately and quickly in this manner, imaging with a lower dose becomes possible, and the exposure of the subject W can be reduced.

  When the image is enlarged or reduced while the stereoscopic image is being displayed on the display unit 42 of the radiological image interpretation device 18, the observation angle may be changed accordingly. When the stereoscopic image is enlarged or reduced, the sense of depth changes. Therefore, it is preferable to change the observation angle so that the sense of depth is constant. For example, when the stereoscopic effect (depth feeling) is reduced due to the enlarged display, the observation angle may be reduced. In this case, for example, the observation angle is determined according to the enlargement magnification (reduction magnification), the projection equivalent image of the stereoscopic image is left as it is, and the projection image corresponding to the observation angle according to the enlargement magnification (reduction magnification) is set. It is good to select and display.

  Further, the setting of the stereoscopic image is not limited to that described in the above setting process (see FIG. 9), and other settings may be performed. As described above, the observation angle corresponding to the enlargement magnification (reduction magnification) may be set. Further, whether the projection angle of the projection image is on the + side or the − side may be set with respect to the projection angle of the projection equivalent image. When setting in this way, the relationship between the left and right of the stereoscopic image and the projection image and the projection equivalent image can be fixed.

  Further, the setting of the stereoscopic image set in the setting process (see FIG. 9) may be stored in the storage unit 86 in association with the set user. For example, by storing the parameters set by the user in association with the user ID, etc., in the next interpretation, when the user inputs the ID, the display reflecting the user's preference is performed. Will be able to.

  In the present embodiment, the configuration in which the radiation image processing device 14 has a function of performing image display control processing has been described in detail. However, the configuration is not limited thereto, and for example, the configuration in which the radiation image interpretation device 18 has the function. May be.

  Further, in the present embodiment, the case where the radiographic image interpretation device 18 is configured to perform stereoscopic viewing is not limited to this, and the console 16 includes a display unit 42 and a function for performing stereoscopic viewing. It may be configured.

  In the present embodiment, the case where the subject is the breast N has been described. However, the present invention is not limited to this, and the subject is not limited. Similarly, the radiographic image capturing apparatus 10 may be an apparatus corresponding to a subject, and is not limited to the mammography apparatus described in the present embodiment.

  Moreover, the radiation used for radiographic imaging is not particularly limited, and X-rays, γ-rays, and the like can be applied.

  In addition, the configurations and operations of the radiographic image capturing system 1, the radiographic image capturing device 10, the radiographic image processing device 14, and the radiographic image interpretation device 18 described in the present embodiment are examples, and the scope does not depart from the gist of the present invention. Needless to say, it can be changed depending on the situation. The flow of radiographic image capturing and the flow of image display control processing described in the present embodiment are also examples, and it goes without saying that they can be changed according to the situation without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Radiographic imaging system 10 Radiographic imaging apparatus 14 Radiological image processing apparatus 18 Radiological image interpretation apparatus 34 Imaging surface (detection surface)
42, 42R, 42L Display unit 60 System control unit 67 I / F unit 80 Tomographic image generation unit 82 Projection equivalent image generation unit 85 Image display setting unit N Breast, W Subject

Claims (10)

A plurality of images shot at each projection angle by the radiation image detector by irradiating the subject on the radiation image detector with radiation from different projection angles from a radiation irradiation unit provided facing the radiation image detector A tomographic image generation means for generating a plurality of tomographic images reconstructed with reference to the detection surface of the radiological image detector based on the acquired plurality of projection images.
Projection equivalent image generation means for reconstructing a projection equivalent image corresponding to a projection image from a plurality of tomographic images generated by the tomographic image generation means;
The display means for displaying a set of images for the right eye and the left eye to perform stereoscopic viewing, the projection equivalent image as one of the set of images and one of the plurality of projection images as the other Control means for controlling display so as to be visible;
An image display system comprising: A height setting means for setting a height of a projection equivalent image reconstructed by the projection equivalent image generation means with reference to a detection surface of the radiation image detector;
The projection equivalent image generating means generates a projection equivalent image corresponding to the height set by the height setting means;
The image display system according to claim 1. A projection angle setting means for setting the projection angle of the projection equivalent image;
The projection equivalent image generating means generates a projection equivalent image based on the projection angle set by the projection angle setting means;
The image display system according to claim 1 or 2. An observation angle setting means for setting an observation angle that is a difference between the projection angle of the projection equivalent image and the projection angle of the projection image;
The control means controls the display means to display the projection equivalent image and the projection image selected according to the observation angle set by the observation angle setting means as the set of images.
The image display system according to any one of claims 1 to 3. The control means controls the display means to display the projection equivalent image and the projection image selected according to a predetermined observation angle according to the degree of stereoscopic vision as the set of images.
The image display system according to any one of claims 1 to 4. A projection image setting means for setting a projection image to be displayed on the display means;
The control unit controls the display unit to display the projection equivalent image and the projection image set by the projection image setting unit as the set of images.
The image display system according to any one of claims 1 to 5. Left and right setting means for setting which of the projection equivalent image and the projection image is for the right eye or the left eye of the set of images,
The control means controls to display the projection equivalent image and the projection image for the right eye or the left eye of the set of images based on the setting of the left and right setting means.
The image display system according to any one of claims 1 to 6. A radiation image capturing device that detects radiation emitted from the radiation irradiation unit with a radiation image detector and captures a projection image; and
The image display system according to any one of claims 1 to 7, wherein a projection image captured by the radiation image capturing apparatus is acquired.
Based on the control by the image display system, display means for displaying a set of images for the right eye and for the left eye to perform stereoscopic viewing;
Radiographic imaging system equipped with. A plurality of images shot at each projection angle by the radiation image detector by irradiating the subject on the radiation image detector with radiation from different projection angles from a radiation irradiation unit provided facing the radiation image detector A tomographic image generation means for generating a plurality of tomographic images reconstructed with reference to the detection surface of the radiological image detector based on the acquired plurality of projection images.
Projection equivalent image generation means for reconstructing a projection equivalent image corresponding to a projection image from a plurality of tomographic images generated by the tomographic image generation means;
The display means for displaying a set of images for the right eye and the left eye to perform stereoscopic viewing, the projection equivalent image as one of the set of images and one of the plurality of projection images as the other An image display control program for causing a computer to function as a control means for controlling to display so that it can be viewed. A plurality of images shot at each projection angle by the radiation image detector by irradiating the subject on the radiation image detector with radiation from different projection angles from a radiation irradiation unit provided facing the radiation image detector A tomographic image generation step of generating a plurality of tomographic images reconstructed with reference to the detection surface of the radiation image detector based on the acquired plurality of projection images,
A projection equivalent image generation step for reconstructing a projection equivalent image corresponding to a projection image from a plurality of tomographic images generated by the tomographic image generation step;
The display means for displaying a set of images for the right eye and the left eye to perform stereoscopic viewing, the projection equivalent image as one of the set of images and one of the plurality of projection images as the other A control process for controlling display so as to be visible;
An image display control method comprising: