Imaging control device, radiography system, imaging control method, and program

Abstract

To enable imaging by easily performing alignment with positioning in past imaging.SOLUTION: An imaging control device that controls radiography of a subject on the basis of inspection information includes: an optical image acquisition unit that acquires a current optical image of the subject before radiography; and a display control unit that causes a display unit to display a past optical image of the subject and the current optical image of the subject that have been imaged based on the coincide inspection information.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The disclosed technology relates to a photographing control device, a radiation imaging system, a photographing control method, and a program.

Background Art

[0002] As an imaging device used for medical image diagnosis and non-destructive inspection by radiation, a radiation imaging device using a flat panel detector (FPD) formed of a semiconductor material has become widespread. Such a radiation imaging device is used, for example, in medical image diagnosis as a digital imaging device for still image photography such as general photography or moving image photography such as fluoroscopy.

[0003] Generally, in radiation imaging, a procedure called positioning is performed to align the position and angle of a subject with respect to a radiation generating device (radiation source) that irradiates radiation.

[0004] Patent Document 1 discloses an apparatus that enables confirmation of a reference image for imaging by displaying a past radiation image, a defective image that could not be imaged normally due to positioning or body movement, and a diagnostic image that is normally imaged and used for diagnosis at the time of imaging.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In Patent Document 1, as an image serving as a shooting reference, a defective image that could not be shot normally due to past radiation images, positioning, body movement, etc. is displayed during shooting. However, since the radiation image shown during positioning is a past radiation image, it is difficult to determine whether the current positioning of the subject matches the positioning of the subject during past shooting.

[0007] The disclosed technology aims to provide a technology that enables shooting to be easily adjusted to the positioning during past shooting.

Means for Solving the Problem

[0008] An imaging control device according to an aspect of the disclosed technology is an imaging control device that controls radiation imaging of a subject based on inspection information, an optical image acquisition unit that acquires a current optical image of the subject before the radiation imaging, and a display control unit that causes a display unit to display a past optical image of the subject taken based on the inspection information and the current optical image of the subject.

Effect of the Invention

[0009] According to the disclosed technology, it becomes possible to easily adjust shooting to the positioning during past shooting.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3A

Figure 3B

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0011] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. It should be noted that the following embodiments do not limit the invention according to the claims. Although a plurality of features are described in the embodiments, not all of these plurality of features are essential for the invention, and the plurality of features may be arbitrarily combined. Further, in the accompanying drawings, the same or similar configurations are denoted by the same reference numerals, and duplicate explanations are omitted.

[0012] In the radiation in the disclosed technology, in addition to α-rays, β-rays, γ-rays, etc., which are beams formed by particles (including photons) emitted by radioactive decay, beams having energy equal to or higher than the same level, for example, X-rays, particle beams, cosmic rays, etc. are also included. Further, the positioning in the disclosed technology refers to the procedure of the imaging preparation for aligning the position and angle of the subject with respect to the radiation generating device (radiation source) that generates radiation before radiation imaging.

[0013] [First Embodiment] In the first embodiment, a configuration will be described in which an optical image (past optical image) taken at the time of past imaging with positioning and an optical image (current optical image) at the current positioning are arranged and displayed on a display device.

[0014] (Configuration example of the radiographic system 10) FIG. 1 is a diagram showing a configuration example of a radiographic system 10 according to the first embodiment. The radiographic system 10 of this embodiment includes an imaging control device 100 and a radiation detection device 130. The imaging control device 100 is connected to the radiation detection device 130 and the radiation generation device 120 via, for example, a wired or wireless network or a dedicated line, and controls radiographic imaging using the radiation detection device 130 and the radiation generation device 120.

[0015] The radiation generation device 120 functions as a radiation source that generates radiation. The radiation generation device 120 is realized by, for example, an X-ray tube and irradiates radiation toward a subject (not shown). A diaphragm (not shown) for shielding radiation is provided on the irradiation surface of the radiation generation device 120, and the imaging control device 100 can adjust the irradiation range of the radiation irradiated from the radiation generation device 120 by controlling the diaphragm that shields the radiation. The radiation generation device 120 starts irradiating radiation according to a command from the imaging control device 100. The radiation generated by the radiation generation device 120 enters the radiation detection device 130 through a subject (not shown). Near the radiation generation device 120, an optical image imaging device 150 (for example, a camera) capable of imaging an optical image of the subject is provided. When the user positions the subject, an optical image imaging device 150 takes an image to acquire the current optical image.

[0016] The radiation detection device 130 detects the radiation irradiated from the radiation generation device 120 and passing through a subject (not shown), and outputs the image data generated according to the detected radiation. Note that the image data may be referred to as medical image or radiation image (hereinafter, the image data is also referred to as radiation image). Specifically, the radiation detection device 130 detects the radiation transmitted through the subject as electric charges corresponding to the transmitted radiation dose. For example, the radiation detection device 130 uses a direct conversion type sensor such as a-Se that directly converts radiation into electric charges, or an indirect type sensor using a scintillator such as CsI that converts radiation into visible light and a photoelectric conversion element such as a-Si. Further, the radiation detection device 130 generates image data by performing A / D conversion on the detected electric charges, and outputs the image data to the imaging control device 100. The radiation detection device 130 images the radiation generated by the radiation generation device 120, and outputs the generated image data to the imaging control device 100.

[0017] The imaging control device 100 has an application function that operates on a computer. That is, the imaging control device 100 has one or more processors and a memory, and the processor executes a program stored in the memory to realize each functional unit described below. However, a part or all of each functional unit may be realized by dedicated hardware.

[0018] The imaging control device 100 sets imaging conditions and the like for controlling radiation imaging based on the examination information received by the operation unit 140, and controls the timing at which the radiation generation device 120 generates radiation and the generation of image data (radiation image) by the radiation detection device 130. The radiation detection device 130 detects the radiation generated by the radiation generation device 120, and outputs the image data (radiation image) corresponding to the detected radiation to the imaging control device 100.

[0019] (Each functional configuration of the imaging control device 100) (Radiation image acquisition unit 101) The radiation image acquisition unit 101 controls the timing at which the radiation detection device 130 generates image data and the timing at which the image data is output, and acquires (receives) the image data generated by the radiation detection device 130.

[0020] (Radiation image storage unit 102) The radiation image storage unit 102 stores the radiation image acquired by the radiation image acquisition unit 101. The radiation image storage unit 102 stores not only the currently captured image data (radiation image: current radiation image) but also the image data captured in the past (radiation image: past radiation image). The stored current radiation image will be positioned as the past radiation image acquired in the most recent imaging (previous imaging) in the next imaging. By storing the current radiation image for each imaging, the accumulation of radiation images (past radiation images) in the radiation image storage unit 102 can increase. As a result, the variations of past radiation images that can be output from the radiation image storage unit 102 to the past image display control unit 103 during positioning can be increased.

[0021] (Inspection information management unit 104) The inspection information management unit 104 manages a plurality of inspection information including the inspection information (past inspection information) in past imaging. The inspection information management unit 104 allows the user to select any one of the plurality of inspection information based on an input from the operation unit 140, and sets the selected inspection information as the inspection target (current inspection information). The inspection information management unit 104 outputs the current inspection information set as the inspection target (current inspection information) to the inspection information determination unit 105. Note that the user may directly input the inspection information from the operation unit 140 to the inspection information determination unit 105. In this case, the user can set the items included in the inspection information used in the determination process in the inspection information determination unit 105 via the operation unit 140.

[0022] (Inspection information determination unit 105) The inspection information determination unit 105 determines whether the acquired current inspection information matches the past inspection information. For the determination of whether the current inspection information matches the past inspection information, the inspection information determination unit 105 may perform the determination using the past inspection information managed by the inspection information management unit 104.

[0023] Here, the inspection information used for determining whether the current inspection information matches the past inspection information may include, for example, the inspection date and time when the inspection was performed, subject information including the subject ID for identifying the subject, and information on various items such as information indicating the imaging site (imaging position) and imaging direction of the subject. The inspection information determination unit 105 determines whether each piece of information included in the inspection information matches.

[0024] In the follow-up observation of the same subject, inspections may be performed at predetermined intervals (for example, several days or weeks after the past inspection). Therefore, in the determination of whether the current inspection information matches the past inspection information, regarding the inspection date and time, it may be determined whether the inspection date and time match based on the elapsed period information Tref (inspection date and time + predetermined elapsed period) obtained by adding the predetermined elapsed period to the information indicating the inspection date and time.

[0025] For example, if the period from the past inspection date and time to the current inspection date and time is within the period defined by the elapsed period information Tref, it may be determined that the inspection date and time match, and if the period from the past inspection date and time to the current inspection date and time exceeds the elapsed period information Tref, it may be determined that the inspection information does not match. In this way, by performing the determination of the identity of the inspection date and time based on the elapsed period information Tref (inspection date and time + predetermined elapsed period), it is possible to easily perform imaging in accordance with the previously taken positioning even when performing follow-up observation of the same subject.

[0026] (Optical image acquisition unit 106) The optical image acquisition unit 106 acquires an optical image (optical image data) captured by an optical image capturing device 150 (e.g., an optical camera). The optical image acquisition unit 106 controls the timing at which the optical image capturing device 150 captures optical image data and the timing at which the captured optical image data is output, and acquires (receives) the optical image (optical image data) captured by the optical image capturing device 150. The optical image acquisition unit 106 outputs the acquired optical image (optical image data) to the optical image storage unit 107 and the optical image display control unit 108.

[0027] (Optical image storage unit 107) The optical image storage unit 107 stores the optical image (optical image data) acquired by the optical image acquisition unit 106. The optical image storage unit 107 stores not only the currently captured optical image (current optical image) but also the optical images captured in the past (past optical images). The stored current optical image will be positioned as the past optical image acquired in the most recent capture (previous capture) in the next capture. By storing the current optical image for each capture, the accumulation of optical images (past optical images) in the optical image storage unit 107 can increase. As a result, the variations of past optical images that can be output from the optical image storage unit 107 to the past image display control unit 103 during positioning can be increased.

[0028] (Past image display control unit 103) The past image display control unit 103 functions as a display control unit that controls the display in the past image display area 160 on the display device 200. The past image display control unit 103 causes the past optical images stored in the optical image storage unit 107 to be displayed in the past image display area 160 according to the determination information of the inspection information determination unit 105.

[0029] By displaying a past optical image in the past image display area 160, it becomes possible to easily align the positioning in the current shooting (hereinafter also referred to as the current positioning) with respect to the positioning at the time of past shooting (hereinafter also referred to as the past positioning) and perform the shooting. From the viewpoint of improving the ease of positioning, that is, making it easier to easily align the current positioning with respect to the past positioning, at least a past optical image in which the inspection information matches may be displayed.

[0030] Note that the present invention is not limited to this configuration, and a past optical image and a past radiation image in which the inspection information matches may be displayed in the past image display area 160. That is, the past image display control unit 103 may display the past radiation image stored in the radiation image storage unit 102 and the past optical image side by side in the past image display area 160 according to the determination information indicating the determination result that the inspection information matches, which is determined by the inspection information determination unit 105. Here, the past radiation image can be a sample image of a radiation image that can be obtained by radiation imaging performed after positioning. By displaying the past radiation image as a sample image, the user can confirm in advance the radiation image assumed in the radiation imaging after positioning, and thereby it becomes possible to further reduce the possibility of blurring.

[0031] As a display mode of the display control, the past image display control unit 103 can arbitrarily change the number of images displayed, the types of images to be displayed, and the combination of images to be displayed in the past image display area 160. For example, the images displayed in the past image display area 160 may be a plurality of past optical images or the like. Alternatively, a plurality of past optical images and a plurality of past radiation images may be displayed in the past image display area 160.

[0032] The past image display control unit 103 can also perform display control to switch between displaying a past optical image and displaying a past optical image and a past radiation image as the image to be displayed in one past image display area 160. Even when performing the switching of the display control, at least a past optical image in which the inspection information matches may be displayed in the past image display area 160.

[0033] (Optical image display control unit 108) The optical image display control unit 108 functions as a display control unit that controls the display in the optical image display area 170 in the display device 200. The optical image display control unit 108 causes the current optical image acquired by the optical image acquisition unit 106 to be displayed in the optical image display area 170 according to the determination information of the inspection information determination unit 105.

[0034] In the imaging control device 100 of the present embodiment, the past image display control unit 103 and the optical image display control unit 108 can function as display control units (103, 108) that cause the display device 200 to display a past optical image of a subject imaged based on inspection information that matches between a past imaging and a current imaging, and a current optical image of the same subject.

[0035] (Flow of display processing: Figure 2) The flow of the display processing of the current optical image and the past optical image by the imaging control device 100 of the present embodiment will be described according to the flowchart of Figure 2.

[0036] (Step S201) In step S201, the inspection information management unit 104 causes the user to select any one of a plurality of inspection information based on an input from the operation unit 140, and sets the selected inspection information as the inspection target (current inspection information). The inspection information management unit 104, for example, displays a plurality of inspection information in a list format, and sets one inspection information selected from the plurality of inspection information in the list format according to the user's operation input as the inspection target (current inspection information). Note that the user may directly input the inspection information from the operation unit 140.

[0037] (Step S202) In step S202, the imaging control device 100 transmits a control signal for causing the radiation detection device 130 to transition to a ready state according to the set inspection information. When the control signal is transmitted from the imaging control device 100 to the radiation detection device 130, the inspection for obtaining a radiation image starts. In response to the control signal transmitted from the imaging control device 100, for example, the radiation detection device 130 controls a bias power supply by a main control circuit and applies a bias voltage to a two-dimensional imaging element. Then, in order to read out the dark current signal accumulated in the pixels, an initialization is performed to read out an image signal from the pixel array by a driving circuit. After the completion of the initialization, the radiation detection device 130 transmits state information indicating that it is in a state ready to obtain a radiation image to the imaging control device 100.

[0038] Also, the imaging control device 100 (inspection information management unit 104) sets operation parameters (such as tube voltage) of the radiation generator 120 based on the inspection information selected in step S201. When the imaging control device 100 receives a notification from the radiation detection device 130 that imaging preparation is complete based on the state information, the imaging control device 100 notifies the radiation generator 120 of exposure permission.

[0039] (Step S203) In step S203, the imaging control device 100 checks whether to display the current optical image captured by the optical image capturing device 150 in the optical image display area 170 under the display control of the optical image display control unit 108. The setting of whether to display the current optical image may be set by the user each time, or may be set in advance. When the user sets to display the current optical image in the optical image display area 170 (S203 - YES), the imaging control device 100 proceeds to step S206.

[0040] (Step S206) In step S206, the optical image display control unit 108 performs display control to display the current optical image in the optical image display area 170 of the display device 200.

[0041] On the other hand, in the determination process of step S203, when the setting for making the current optical image non-display is set (S203-NO), the imaging control device 100 advances the process to step S205.

[0042] (Step S205) In step S205, the optical image display control unit 108 makes the current optical image in the optical image display area 170 non-display and advances the process to step S207.

[0043] (Step S207) In step S207, the imaging control device 100 checks whether to display the past optical image stored in the optical image storage unit 107 in the past image display area 160 under the display control of the past image display control unit 103. Whether to display the past optical image can be set by the user each time, or can be set in advance.

[0044] In the determination process of step S207, when the setting is not to display the past optical image (S207-NO), the imaging control device 100 advances the process to step S210.

[0045] (Step S210) In step S210, the past image display control unit 103 makes the past optical image in the past image display area 160 non-display and advances the process to step S212.

[0046] On the other hand, when the user sets to display the past optical image in the past image display area 160 (S207-YES), the imaging control device 100 advances the process to step S208.

[0047] (Step S208) In step S208, the inspection information determination unit 105 of the imaging control device 100 checks whether the past inspection information managed by the inspection information management unit 104 matches the current inspection information in the inspection started in step S202.

[0048] In the determination process of step S208, the inspection information determination unit 105 performs a determination process based on the current inspection information selected by the user from the display of multiple list-form inspection information or the inspection information input by the user using the operation unit 140. The inspection information used for determining whether the current inspection information matches the past inspection information may include, for example, inspection date and time, subject information including patient name and patient ID for identifying the patient, and items such as the imaging site (imaging position) and imaging direction of the subject. The inspection information determination unit 105 determines whether each item included in the inspection information matches.

[0049] In the determination process of step S208, if it is determined that the past inspection information matches the current inspection information (S208 - YES), the inspection information determination unit 105 proceeds with the process to step S211.

[0050] (Step S211) In step S211, the past image display control unit 103 performs display control to display the past optical image stored in the optical image storage unit 107 in the past image display area 160 of the display device 200. The user can perform positioning while comparing the current optical image with the past optical image, and it becomes possible to easily align the current positioning with the past positioning.

[0051] Note that in step S211, when displaying the past optical image, the past image display control unit 103 may display the past radiation image stored in the radiation image storage unit 102 and the past optical image side by side in the past image display area 160. The past radiation image can be a sample image of the radiation image that can be obtained by radiation imaging performed after positioning. By displaying the past radiation image as a sample image, the user can preview the radiation image expected in the radiation imaging after positioning, thereby further reducing the possibility of misimaging.

[0052] On the other hand, in the determination process of step S208, if the past inspection information and the current inspection information do not match (S208-NO), the inspection information determination unit 105 advances the process to step S212.

[0053] (Steps S212, S213) In step S212, in accordance with the user's operation on the operation unit 140, the imaging control device 100 outputs a control signal, and the radiation generation device 120 and the radiation detection device 130 start radiation imaging. At the timing when all radiation imaging is completed, the process proceeds to step S213, and the inspection ends (step S213).

[0054] Through the above steps, the radiation imaging of the imaging target is completed, and the process proceeds to the next imaging. If there are multiple imaging operations within the inspection, the imaging control device 100 may repeatedly execute the processing flow described with reference to FIG. 2.

[0055] (Explanation of display examples (FIGS. 3A and 3B)) Next, display examples of the display device 200 by the display control of the past image display control unit 103 and the optical image display control unit 108 will be described with reference to FIGS. 3A and 3B. FIG. 3A is a diagram showing a display example of the current optical image, the past optical image, and the past radiation image according to the first embodiment, and FIG. 3B is a diagram showing a display example of the current optical image and the past optical image.

[0056] In FIGS. 3A and 3B, the display device 200 has an image display area 301, a past image display area 160, and an optical image display area 170. The image display area 301 is also a display area where the radiation image captured in step S212 is displayed. When the display control unit (103, 108) displays the radiation image in the image display area 301, the display control unit (103, 108) performs display control so as not to display the past image display area 160 and the optical image display area 170 within the image display area 301.

[0057] The current optical image 306 is an optical image acquired by the optical image acquisition unit 106. The current optical image 306 is displayed within the optical image display area 170 under the display control of the optical image display control unit 108. Also, the past optical image 305 is displayed within the past image display area 160 under the display control of the past image display control unit 103. When further displaying the past radiation image 304, the past radiation image 304 is displayed within the past image display area 160 under the display control of the past image display control unit 103. The past optical image 305 is an image stored in the optical image storage unit 107, and the past radiation image 304 is an image stored in the radiation image storage unit 102.

[0058] In the display example of FIG. 3A, an example of displaying the past optical image 305 and the past radiation image 304 in the past image display area 160 is shown, but it is not limited to this example. From the viewpoint of improving the ease of positioning, which makes it easier to align the current positioning with respect to the past positioning, as shown in FIG. 3B, at least the past optical image 305 with matching inspection information may be displayed within the past image display area 160.

[0059] The display examples shown in FIGS. 3A and 3B are exemplary, and the display control by the past image display control unit 103 and the optical image display control unit 108 is not limited to this display example, and the display position and the number of displayed images can be arbitrarily changed by the display control. Also, the past image display control unit 103 can perform display control to display or hide the past radiation image 304 and the past optical image 305. Similarly, the optical image display control unit 108 can also perform display control to display or hide the current optical image 306.

[0060] When displaying the past optical image 305 and the past radiation image 304, the inspection date and time do not necessarily have to be images obtained in the same past inspection, and may be images of inspections performed at different inspection dates and times. For example, similar to the determination process (step S208) of whether the current inspection information matches the past inspection information, as long as it is an image of an inspection for which the identity of the inspection date and time can be ensured based on the elapsed period information Tref (inspection date and time + a predetermined elapsed period), it is acceptable. Even if it is an inspection performed at a different inspection date and time, if it is within the period defined by the elapsed period information Tref, it may be determined that the inspection date and time match, and the past optical image 305 and the past radiation image 304 may be displayed.

[0061] The past image display control unit 103 can arbitrarily change the type of image to be displayed in the past image display area 160 and the number of images (number of sheets) to be displayed, and may perform display control according to the settings of the imaging control device 100 and the inspection information management unit 104. For example, the past image display control unit 103 may display a plurality of past optical images in the past image display area 160. Based on the elapsed period information Tref (inspection date and time + a predetermined elapsed period), as long as it is an image of an inspection for which the identity of the inspection date and time can be ensured, for example, a plurality of past optical images (the first past optical image, the second past optical image, the third past optical image...) with different inspection dates and times for the same subject may be displayed in chronological order. Similarly, a plurality of past radiation images with different inspection dates and times for the same patient may be displayed in chronological order.

[0062] (Effect of the First Embodiment) As described above, according to the first embodiment, the current optical image 306 and the past optical image 305 with matching inspection information can be arranged and displayed. The user can check the current optical image 306 while checking the past optical image 305 to position the subject. According to this embodiment, it becomes possible to perform imaging easily in accordance with the positioning at the time of past imaging. Thereby, it is possible to reduce the load on the user at the time of imaging and improve the efficiency of the workflow.

[0063] [Second Embodiment] In the second embodiment, a configuration will be described in which the search range of the past image of inspection information is set, and the past optical image to be referred to during positioning is displayed. The configuration example of the radiation imaging system 10 according to the second embodiment is the same as that of the radiation imaging system 10 in the first embodiment. To avoid redundant explanations, in the following description, the processes different from those of the first embodiment will be described. FIG. 4 is a flowchart for explaining the flow of the process of displaying a past optical image according to the search range. In FIG. 4, in the radiation imaging system 10 according to the second embodiment, regarding the search range of inspection information (past inspection information) in the past inspection when displaying a past optical image, and the process of displaying a past optical image according to the search range, the flow of the process until the imaging is completed will be described. Note that the determination processes (S203, S205, S206) for determining whether to display the current optical image and the determination processes (S207, S210) for determining whether to display a past optical image are the same as those in the flowchart of FIG. 2 and are omitted in the flowchart of FIG. 4. However, these processes may be executed after the process of step S402 in the flowchart of FIG. 4.

[0064] (Step S401) In step S401, the inspection information management unit 104 allows the user to select one of the plurality of pieces of inspection information based on an input from the operation unit 140, and sets the selected inspection information as the inspection target (current inspection information). Alternatively, the inspection information management unit 104 sets the inspection information directly input by the user from the operation unit 140 as the inspection target (current inspection information). After the input of the inspection information is completed, the inspection information management unit 104 proceeds with the process to step S402.

[0065] (Step S402) In step S402, the imaging control device 100 transmits a control signal for causing the radiation detection device 130 to transition to a ready state according to the set inspection information. When the control signal is transmitted from the imaging control device 100 to the radiation detection device 130, the inspection starts, and the imaging control device 100 proceeds with the process to step S403.

[0066] (Step S403) In step S403, the inspection information determination unit 105 sets the information on the search range previously input by the user from the operation unit 140 as the search range to be used in this process. Here, the search range refers to the range for suppressing the display of unnecessary past optical images among those where the past inspection information managed by the inspection information management unit 104 matches the current inspection information set in step S401, or for narrowing down to obtain (limit) specific inspection information from multiple pieces of matching inspection information when there are multiple pieces of matching inspection information. As the search range, for example, the user can arbitrarily set the search range by selecting or inputting the search range via the operation unit 140, such as a period or up to the last several inspections. As the search range, for example, the last N years (N is an integer) such as within the past 5 years may be set to specify the inspection information implemented within the last N years.

[0067] (Step S404) In step S404, the inspection information determination unit 105 checks whether the past inspection information managed by the inspection information management unit 104 matches the current inspection information set in step S401 in the inspection started in step S402. If it is determined that the past inspection information and the current inspection information match (S404 - YES), the inspection information determination unit 105 proceeds with the process to step S405. On the other hand, if it is determined in the determination process of step S404 that the past inspection information and the current inspection information do not match (S404 - NO), the inspection information determination unit 105 proceeds with the process to step S408.

[0068] (Step S405) In step S405, when it is determined in step S404 that the past inspection information and the current inspection information match, the inspection information determination unit 105 determines whether there is inspection information within the search range set in step S403. If it is determined that there is inspection information within the set search range (S405 - YES), the inspection information determination unit 105 proceeds with the process to step S406.

[0069] On the other hand, in the determination process of step S405, if it is determined that there is no inspection information within the search range (S405-NO), the inspection information determination unit 105 proceeds with the process to step S408.

[0070] (Step S406) In step S405, the inspection information determination unit 105 identifies the inspection information within the search range set in step S403 among the past inspection information managed by the inspection information management unit 104 and the past inspection information that matches the current inspection information set in step S401, and proceeds with the process to step S407.

[0071] (Step S407) In step S407, the past image display control unit 103 displays the past optical image of the inspection information specified in step S405. When a plurality of past optical images of the extracted inspection information are specified, the past image display control unit 103 may display a plurality of past optical images, or may display a past image selected from the plurality of past optical images. The user can select the past optical image to be displayed in the past image display area 160 via the operation unit 140. For example, the past image display control unit 103 may be set to display the past optical image in the latest inspection information in the past image display area 160 by default, or may be set to display the past optical image in the inspection information M times ago (M is an integer), for example, the image of the inspection two times ago. After the display of the past optical image is completed, the past image display control unit 103 proceeds with the process to step S408.

[0072] (Steps S408, S409) In step S408, in accordance with the user's operation on the operation unit 140, the imaging control device 100 outputs a control signal, and radiation imaging is started by the radiation generation device 120 and the radiation detection device 130. At the timing when all radiation imaging is completed, the process proceeds to step S409, and the inspection ends (step S409).

[0073] Through the above steps, the radiographic imaging of the object to be imaged is completed, and the process proceeds to the next imaging. If there are multiple imaging sessions during the examination, the imaging control device 100 may repeatedly execute the processing flow described with reference to FIG. 4.

[0074] (Effect of the Second Embodiment) As described above, according to the second embodiment, it is possible to suppress the display of unnecessary past optical images by setting the search range. Further, when there are a plurality of past optical images to be displayed within the search range, by allowing the user to select or display the latest image, it becomes easier to select the past optical image to be referred to as a reference image during positioning. While confirming the reference image (past optical image), the current optical image can be confirmed, and the positioning of the subject can be performed. According to the present embodiment, it becomes possible to easily perform imaging in accordance with the positioning at the time of past imaging. As a result, it is possible to reduce the burden on the user during imaging and improve the efficiency of the workflow.

[0075] [Third Embodiment] In the third embodiment, a configuration for enlarging and displaying the current optical image when past optical images are not displayed will be described. The configuration example of the radiographic imaging system 10 according to the third embodiment is the same as that of the radiographic imaging system 10 in the first embodiment. To avoid redundant explanations, in the following description, the processing different from that of the first embodiment will be described. FIG. 5 is a flowchart for explaining the flow of processing for enlarging and displaying the current optical image when past optical images are not displayed. In FIG. 5, in the radiographic imaging system 10 according to the third embodiment, the flow of processing until imaging is completed is described with respect to the display processing of the current optical image when past optical images are not displayed.

[0076] Note that the determination processes (S203, S205, S206) for whether to display the current optical image and the determination processes (S207, S210) for whether to display the past optical image are the same as the flowchart in FIG. 2 and are omitted in the flowchart in FIG. 5. However, these processes may be executed after the process of step S502 in the flowchart of FIG. 5.

[0077] (Step S501) In step S501, the inspection information management unit 104 causes the user to select one of the plurality of inspection information based on the input from the operation unit 140, and sets the selected inspection information as the inspection target (current inspection information). Alternatively, the inspection information management unit 104 sets the inspection information directly input by the user from the operation unit 140 as the inspection target (current inspection information). After the input of the inspection information is completed, the inspection information management unit 104 proceeds with the process to step S502.

[0078] (Step S502) In step S502, the imaging control device 100 transmits a control signal for causing the radiation detection device 130 to transition to the ready state according to the set inspection information. When the control signal is transmitted from the imaging control device 100 to the radiation detection device 130, the inspection is started, and the imaging control device 100 proceeds with the process to step S503.

[0079] (Step S503) In step S503, the imaging control device 100 determines whether to display a past optical image. In this step, the imaging control device 100 determines whether to perform imaging with the setting of displaying the past optical image based on the user's setting. When the imaging control device 100 determines to perform imaging with the setting of displaying the past optical image (S503 - YES), the process proceeds to step S504. On the other hand, when the imaging control device 100 determines to perform imaging with the setting of not displaying the past optical image (S503 - NO), the process proceeds to step S505.

[0080] (Step S504) In step S504, the past image display control unit 103 performs display control to display the past optical image stored in the optical image storage unit 107 in the past image display area 160 of the display device 200. The user can perform positioning while comparing the current optical image with the past optical image, and can easily align the current positioning with the past positioning. After the positioning is completed, the past image display control unit 103 advances the process to step S506. When displaying the past optical image, the past image display control unit 103 may display the past radiation image stored in the radiation image storage unit 102 and the past optical image side by side in the past image display area 160. The past radiation image can be a sample image of the radiation image that can be obtained by radiation imaging performed after the positioning. By displaying the past radiation image as a sample image, the user can confirm in advance the radiation image assumed in the radiation imaging after the positioning, and thereby can further reduce the possibility of misimaging.

[0081] (Step S505), In step S505, the past image display control unit 103 makes the past optical image non-displayed. As a result, the past optical image is not displayed in the past image display area 160 which is the display area of the past optical image.

[0082] Also, the optical image display control unit 108 performs display control to expand and display the current optical image in the optical image display area 170 which is the display area of the current optical image according to the user operation using the operation unit 140.

[0083] For example, as shown in FIG. 3A, when the image size in the case of displaying the past optical image 305 and the current optical image 306 side by side is set as the default reference size (the first image size), the optical image display control unit 108 expands the current optical image to a second image size larger than the reference size (the first image size) according to the user operation and displays it in the optical image display area 170.

[0084] The user can use the operation unit 140 to enlarge and display the current optical image to an arbitrary size and perform positioning while checking the current optical image. After the positioning is completed, the optical image display control unit 108 proceeds with the process to step S506. Note that the enlarged display of the current optical image when the display setting of the past optical image is OFF is not an essential process, but is an arbitrary process according to the user's operation using the operation unit 140. For example, when there is no user operation input using the operation unit 140, the optical image display control unit 108 displays the current optical image of the non-enlarged size (reference size (first image size)) in the optical image display area 170, and the user may check the current optical image and perform positioning.

[0085] (Steps S506, S507) In step S506, in accordance with the user's operation on the operation unit 140, the imaging control device 100 outputs a control signal, and the radiation generation device 120 and the radiation detection device 130 start radiation imaging. At the timing when all the radiation imaging is completed, the process proceeds to step S507, and the inspection ends (S507).

[0086] Through the above steps, the radiation imaging of the imaging target is completed, and the process proceeds to the next imaging. If there are multiple imagings within the inspection, the imaging control device 100 may repeatedly execute the processing flow described with reference to FIG. 5.

[0087] (Effect of the Third Embodiment) As described above, according to the third embodiment, when the past optical image is not being displayed, by enlarging and displaying the current optical image more greatly, it becomes easier to check the current optical image. As a result, it becomes possible to easily perform imaging in accordance with the positioning at the time of past imaging. Thereby, it becomes possible to reduce the user's load during imaging and improve the workflow efficiency.

[0088] [Fourth Embodiment] In the fourth embodiment, a configuration for performing imaging related to the privacy of the subject will be described. The configuration example of the radiation imaging system 10 according to the fourth embodiment is the same as that of the radiation imaging system 10 in the first embodiment. To avoid redundant explanations, in the following description, processes different from those of the first embodiment will be described. FIG. 6 is a flowchart for explaining the flow of imaging processing related to the privacy of the subject. In FIG. 6, in the radiation imaging system 10 according to the fourth embodiment, the flow of processing until the imaging related to the privacy of the subject is completed will be explained.

[0089] Note that the determination processes (S203, S205, S206) on whether to display the current optical image and the determination processes (S207, S210) on whether to display the past optical image are the same as those in the flowchart of FIG. 2 and are omitted in the flowchart of FIG. 6. However, these processes may be executed after the process of step S602 in the flowchart of FIG. 6.

[0090] (Step S601) In step S601, the inspection information management unit 104 causes the user to select one of the plurality of inspection information based on the input from the operation unit 140, and sets the selected inspection information as the inspection target (current inspection information). Alternatively, the inspection information management unit 104 sets the inspection information directly input by the user from the operation unit 140 as the inspection target (current inspection information). After the input of the inspection information is completed, the inspection information management unit 104 advances the process to step S602.

[0091] (Step S602) In step S602, the imaging control device 100 transmits a control signal for causing the radiation detection device 130 to transition to a ready state according to the set inspection information. When the control signal is transmitted from the imaging control device 100 to the radiation detection device 130, the inspection starts, and the imaging control device 100 advances the process to step S603.

[0092] (Step S603) In step S603, the inspection information determination unit 105 of the imaging control device 100 determines whether the inspection started in step S602 is an inspection by imaging related to the privacy of the subject. Whether it is imaging related to the privacy of the subject may be set (manually set) by an input from the operation unit 140 by the user, or it is possible to determine by setting privacy imaging information indicating that it is imaging related to the privacy of the subject in the setting of the imaging protocol.

[0093] Here, imaging related to the privacy of the subject is, for example, imaging by wearing light clothing or undressing, or the part to be imaged is the hip joint or the like, and there is a possibility that the private part (genitals, vulva) is reflected as an optical image. The imaging control device 100 determines whether there is an input from the operation unit 140 by the user, or whether privacy imaging information is set in advance in the imaging protocol.

[0094] When the imaging control device 100 determines that it is imaging related to the privacy of the subject (S603 - YES), the process proceeds to step S605.

[0095] On the other hand, in the determination process of step S603, when the imaging control device 100 determines that it is not imaging related to the privacy of the subject (S603 - NO), the process proceeds to step S604.

[0096] (Step S604) In step S604, the past image display control unit 103 performs display control to display the past optical images stored in the optical image storage unit 107 in the past image display area 160 of the display device 200.

[0097] Also, the optical image display control unit 108 performs display control to display the current optical image in the optical image display area 170 of the display device 200.

[0098] The user can perform positioning while comparing the current optical image with the past optical image, and can easily align the current positioning with the past positioning. After the positioning is completed, the past image display control unit 103 advances the process to step S606. When displaying the past optical image, the past image display control unit 103 may display the past radiation image stored in the radiation image storage unit 102 and the past optical image side by side in the past image display area 160. The past radiation image can be a sample image of the radiation image that can be obtained by the radiation imaging performed after the positioning. By displaying the past radiation image as a sample image, the user can confirm in advance the radiation image assumed in the radiation imaging after the positioning, thereby making it possible to further reduce the possibility of a bad shot.

[0099] (Step S605) In step S605, the past image display control unit 103 performs display control to make the past optical image stored in the optical image storage unit 107 non-displayed in the past image display area 160 of the display device 200. Also, the optical image display control unit 108 performs display control to make the current optical image in the optical image display area 170 of the display device 200 non-displayed, and advances the process to step S606.

[0100] (Steps S606, S607) In step S606, in accordance with the user's operation on the operation unit 140, the imaging control device 100 outputs a control signal, and the radiation imaging is started by the radiation generator 120 and the radiation detector 130. At the timing when all the radiation imaging is completed, the process advances to step S607, and the inspection ends (S607).

[0101] Through the above steps, the radiation imaging of the imaging target is completed, and the process proceeds to the next imaging. If there are multiple imaging operations within the inspection, the imaging control device 100 may repeatedly execute the processing flow described in FIG. 6.

[0102] (Effect of the Fourth Embodiment) As described above, according to the fourth embodiment, when the imaging is an imaging related to the privacy of the subject, non-display control can be automatically performed so as not to display the past optical image and the current optical image. Thereby, the operation for the user to make the past optical image and the current optical image non-display becomes unnecessary, and thereby, the burden on the user at the time of imaging can be reduced, and the workflow can be made efficient.

[0103] [Fifth Embodiment] In the fifth embodiment, a configuration for displaying the determination result of the positioning matching degree will be described. The configuration example of the radiation imaging system 10 according to the fifth embodiment is the same as that of the radiation imaging system 10 in the first embodiment. To avoid redundant explanations, in the following description, the processes different from those of the first embodiment will be described. FIG. 7 is a flowchart for explaining the flow of the process of displaying the determination result of the positioning matching degree. In FIG. 7, in the radiation imaging system 10 according to the fifth embodiment, the determination result of the positioning matching degree is displayed in the past image display area 160 and the optical image display unit 180, and the flowchart until the display of the optical image and the end of imaging when the matching result of the past and current positioning determination results is displayed is shown. Note that the determination processes (S203, S205, S206) for determining whether to display the current optical image and the determination processes (S207, S210) for determining whether to display the past optical image are the same as the flowchart of FIG. 2 and are omitted in the flowchart of FIG. 5. However, these processes may be executed after the process of step S702 in the flowchart of FIG. 7.

[0104] (Step S701) In step S701, the inspection information management unit 104 causes the user to select one of the plurality of inspection information based on the input from the operation unit 140, and sets the selected inspection information as the inspection target (current inspection information). Alternatively, the inspection information management unit 104 sets the inspection information directly input by the user from the operation unit 140 as the inspection target (current inspection information). After the input of the inspection information is completed, the inspection information management unit 104 advances the process to step S702.

[0105] (Step S702) In step S702, the imaging control device 100 transmits a control signal for causing the radiation detection device 130 to transition to a ready state according to the set inspection information. When the control signal is transmitted from the imaging control device 100 to the radiation detection device 130, the inspection starts, and the imaging control device 100 advances the process to step S703.

[0106] (Step S703) In step S703, the past image display control unit 103 displays the past optical image stored in the optical image storage unit 107 in the past image display area 160. Then, the past image display control unit 103 advances the process to step S704.

[0107] (Step S704) In step S704, the imaging control device 100 determines whether it is set to display the determination result of the positioning coincidence degree in the current optical image and the past optical image. Here, the setting for displaying the determination result of the positioning coincidence degree can be set (manually set) by the user's input from the operation unit 140.

[0108] When the imaging control device 100 determines that it is set to display the determination result of the positioning matching degree (S704 - YES), the process proceeds to step S705. On the other hand, in the determination process of step S704, when the imaging control device 100 determines that it is not set to display the determination result of the positioning matching degree (S704 - NO), the process proceeds to step S707.

[0109] (Step S705) In step S705, the display control units (103, 108) of the imaging control device 100 determine the matching degree between the positioning result of the past optical image and the positioning result of the current optical image, and proceed to step S706. In this step, the display control units (103, 108) of the imaging control device 100 extract the feature information of the subject in the past optical image and the current optical image respectively, and by comparing the extracted feature information of the subject, obtain information indicating the matching degree between the positioning result of the past optical image and the positioning result of the current optical image. The information indicating the matching degree can be obtained, for example, as the ratio of the matching of the feature information of the subject in the current optical image based on the feature information of the subject in the past optical image. When the positioning results of the past optical image and the current optical image completely match, the matching degree is 100%. Also, when the ratio of the matching of the feature information of the subject in the current optical image based on the feature information of the subject in the past optical image is 90%, this value is obtained as the matching degree.

[0110] (Step S706) In step S706, the imaging control device 100 obtains the determination result of the positioning matching degree determined in step S705, and causes the display device 200 to display the obtained determination result of the positioning matching degree. As an example of the display of the determination result of the matching degree, for example, it may be displayed by a numerical value or a symbol indicating the degree of positioning matching between the past optical image and the current optical image.

[0111] (Steps S707, S708) In step S707, in accordance with the user's operation on the operation unit 140, the imaging control device 100 outputs a control signal, and the radiation generation device 120 and the radiation detection device 130 start radiation imaging. At the timing when all radiation imaging is completed, the process proceeds to step S708, and the inspection ends (S708).

[0112] Through the above steps, the radiation imaging of the imaging target is completed, and the process proceeds to the next imaging. If there are multiple imaging operations during the inspection, the imaging control device 100 may repeatedly execute the processing flow described with reference to FIG. 7.

[0113] (Example of display of positioning consistency) FIG. 8 is a diagram showing an example of display of the positioning consistency. FIG. 8 shows an example of displaying the determination result of the positioning consistency between the past optical image and the current optical image displayed in the past image display area 160 and the optical image display area 170. In FIG. 8, the image display area 801 of the display device 200 has a past image display area 160, an optical image display area 170, and a consistency display area 806 for displaying the determination result of the positioning consistency.

[0114] The past image display control unit 103 performs display control to display the past optical image 804 in the past image display area 160, and the optical image display control unit 108 performs display control to display the current optical image 805 in the optical image display area 170.

[0115] The imaging control device 100 determines the consistency between the positioning result of the past optical image 804 and the positioning result of the current optical image 805, and causes the consistency display area 806 to display the determination result of the positioning consistency. Note that the information displayed in the consistency display area 806 may be displayed as a numerical value or symbol indicating the degree of consistency.

[0116] (Effects of the Fifth Embodiment) As described in the fifth embodiment above, by displaying the determination result of the degree of coincidence of the positioning results in the past optical image and the current optical image, the degree of coincidence of the positioning between the past optical image and the current optical image can be presented as visible information. This makes it possible to easily perform imaging in accordance with the positioning at the time of past imaging. As a result, it is possible to reduce the user's burden during imaging and improve the workflow efficiency.

[0117] The disclosure of this specification includes the following imaging control device, radiation imaging system, imaging control method, and program. (Item 1) An imaging control device that controls the radiation imaging of a subject based on inspection information, an optical image acquisition unit that acquires a current optical image of the subject before the radiation imaging; a display control unit that causes a display unit to display a past optical image of the subject taken based on the inspection information and the current optical image of the subject; An imaging control device comprising: (Item 2) The imaging control device according to Item 1, wherein the display control unit causes the display unit to display a past radiation image of the subject taken based on the inspection information together with the past optical image. (Item 3) The imaging control device according to Item 2, wherein the display control unit switches the display of the past optical image or the past optical image and the past radiation image and causes the display unit to display the same. (Item 4) A management unit that manages a plurality of pieces of inspection information in past imaging; a determination unit that determines whether the current inspection information set for the radiation imaging matches the plurality of pieces of inspection information; an optical image storage unit that stores the current optical image and a past optical image acquired in the past; and further comprising: The display control unit acquires, from the optical image storage unit, a past optical image taken with inspection information that matches the current inspection information among the plurality of pieces of inspection information and causes the display unit to display the same, the imaging control device according to any one of Items 1 to 3. (Item 5) The imaging control apparatus further includes a radiation image storage unit that stores past radiation images acquired by the radiation image acquisition unit, The display control unit, The imaging control apparatus according to item 4, which acquires, from the radiation image storage unit, a past radiation image taken with inspection information that matches the current inspection information among the plurality of inspection information and causes the display unit to display the image. (Item 6) When there are a plurality of past optical images taken with inspection information that matches the current inspection information among the plurality of inspection information, The imaging control apparatus according to item 4, wherein the display control unit causes the display unit to display the plurality of past optical images in time series as the past optical images. (Item 7) When there are a plurality of past optical images taken with inspection information that matches the current inspection information among the plurality of inspection information, The imaging control apparatus according to item 4, wherein the display control unit causes the display unit to display, as the past optical image, the optical image acquired in the latest inspection among the plurality of past optical images. (Item 8) The determination unit identifies inspection information within a preset search range among past inspection information that matches the current inspection information among the plurality of inspection information, The imaging control apparatus according to item 4, wherein the display control unit acquires, from the optical image storage unit, a past optical image taken with the identified inspection information within the search range and causes the display unit to display the image. (Item 9) The imaging control apparatus according to any one of items 1 to 8, wherein the display control unit switches between display control for causing the display unit to display the past optical image or the current optical image and display control for causing the display unit not to display the past optical image or the current optical image. (Item 10) The display control unit causes the display unit to display the past optical image and the current optical image in a first image size, When the past optical image is not displayed, the imaging control apparatus according to any one of items 1 to 9, wherein the display control unit causes the display unit to display the current optical image in a second image size that is larger than the first image size. (Item 11) When the determination unit determines that, based on a preset input setting, the photographing is set to be related to the privacy of the subject, the display control unit performs display control to make the past optical image and the current optical image non-displayed. The photographing control apparatus according to Item 4. (Item 12) The display control unit compares the feature information of the subject extracted from the past optical image and the current optical image, and obtains the degree of coincidence between the positioning of the past optical image and the positioning of the current optical image, and causes the display unit to display the degree of coincidence. The photographing control apparatus according to any one of Items 1 to 11. (Item 13) The inspection information includes information indicating the inspection date and time when the inspection was performed, subject information for identifying the subject, and information indicating the photographing site and photographing direction of the subject. The determination unit determines whether each piece of information included in the plurality of inspection information and the current inspection information matches. The photographing control apparatus according to Item 4. (Item 14) The determination unit uses the elapsed period information obtained by adding a predetermined period to the information indicating the inspection date and time as a reference, and if it is within the period defined by the elapsed period information, determines that the information indicating the inspection date and time matches. The photographing control apparatus according to Item 13. (Item 15) A radiation detection device, The photographing control apparatus according to any one of Items 1 to 14 that controls the radiation photographing using the radiation detection device, and a radiation imaging system having the same. (Item 16) A photographing control method for controlling the radiation photographing of a subject based on inspection information, an optical image acquisition step of acquiring a current optical image of the subject before the radiation photographing, a display control step of causing a display unit to display a past optical image of the subject photographed based on the inspection information and the current optical image of the subject, and a photographing control method having the same. (Item 17) A program for causing a computer to execute the photographing control method according to Item 16.

[0118] [Other Embodiments] The disclosed technology can also be realized by supplying a program that implements one or more functions of the above-described embodiments to a system or device via a network or a storage medium, and having one or more processors in a computer of the system or device read and execute the program. It can also be realized by a circuit (for example, ASIC) that implements one or more functions.

[0119] The disclosed technology is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the spirit and scope of the invention. Accordingly, the claims are appended to disclose the scope of the invention.

Explanation of Reference Numerals

[0120] 10: Radiographic imaging system, 100: Imaging control device, 101: Radiation image acquisition unit, 102: Radiation image storage unit, 103: Past image display control unit, 104: Inspection information management unit (management unit), 105: Inspection information determination unit (determination unit), 106: Optical image acquisition unit, 107: Optical image storage unit, 108: Optical image display control unit, 103, 108: Display control unit, 120: Radiation generator, 130: Radiation detector, 200: Display device

Claims

1. An imaging control device for controlling a radiation imaging of a subject based on inspection information, an optical image acquisition unit that acquires a current optical image of the subject before the radiation imaging; a display control unit that causes a display unit to display a past optical image of the subject taken based on the inspection information and the current optical image of the subject; An imaging control device comprising:

2. The imaging control device according to claim 1, wherein the display control unit causes the display unit to display a past radiation image of the subject taken based on the inspection information together with the past optical image.

3. The imaging control device according to claim 2, wherein the display control unit switches the display of the past optical image or the past optical image and the past radiation image and causes the display unit to display the switched image.

4. a management unit that manages a plurality of pieces of inspection information in past imaging; a determination unit that determines whether the current inspection information set for the radiation imaging matches the plurality of pieces of inspection information; further comprising an optical image storage unit that stores the current optical image and a past optical image acquired in the past, The display control unit, The imaging control device according to claim 1, wherein the past optical image taken with the inspection information that matches the current inspection information among the plurality of pieces of inspection information is acquired from the optical image storage unit and displayed on the display unit.

5. further comprising a radiation image storage unit that stores a past radiation image acquired by a radiation image acquisition unit, The display control unit, The imaging control device according to claim 4, wherein the past radiation image taken with the inspection information that matches the current inspection information among the plurality of pieces of inspection information is acquired from the radiation image storage unit and displayed on the display unit.

6. When there are a plurality of past optical images taken with inspection information that matches the current inspection information among the plurality of inspection information, The display control unit causes the display unit to display the plurality of past optical images in time series as the past optical images, according to the imaging control device of claim 4.

7. When there are a plurality of past optical images taken with inspection information that matches the current inspection information among the plurality of inspection information, The display control unit causes the display unit to display, as the past optical images, the optical images obtained in the latest inspection among the plurality of past optical images, according to the imaging control device of claim 4.

8. The determination unit specifies inspection information within a preset search range among the past inspection information that matches the current inspection information among the plurality of inspection information, The display control unit acquires, from the optical image storage unit, the past optical images taken with the specified inspection information within the search range and causes the display unit to display them, according to the imaging control device of claim 4.

9. The display control unit switches between display control for causing the display unit to display the past optical image or the current optical image, or display control for causing the display unit to hide the past optical image or the current optical image, according to the imaging control device of claim 1.

10. The display control unit causes the display unit to display the past optical image and the current optical image in a first image size, When hiding the past optical image, the display control unit causes the display unit to display the current optical image in a second image size that is enlarged compared to the first image size, according to the imaging control device of claim 1.

11. When the determination unit determines, based on a preset input setting, that the imaging is related to the privacy of the subject, The imaging control device according to claim 4, wherein the display control unit performs display control so as to make the past optical image and the current optical image non-displayed.

12. The imaging control device according to claim 1, wherein the display control unit causes the display unit to display the degree of coincidence between the positioning of the past optical image and the positioning of the current optical image, which is obtained by comparing the feature information of the subject extracted from the past optical image and the current optical image.

13. The inspection information includes information indicating the inspection date and time when the inspection was performed, subject information for identifying the subject, and information indicating the imaging site and imaging direction of the subject. The imaging control device according to claim 4, wherein the determination unit determines whether each piece of information included in the plurality of inspection information and the current inspection information matches.

14. The imaging control device according to claim 13, wherein the determination unit determines that the information indicating the inspection date and time matches if it is within the period defined by the elapsed period information, based on the elapsed period information obtained by adding a predetermined period to the information indicating the inspection date and time.

15. A radiation detection device, The imaging control device according to claim 1, which controls the radiation imaging using the radiation detection device, A radiation imaging system having the above.

16. An imaging control method for controlling the radiation imaging of a subject based on inspection information, comprising: An optical image acquisition step of acquiring a current optical image of the subject before the radiation imaging; A display control step of causing a display unit to display the past optical image of the subject taken based on the inspection information and the current optical image of the subject; An imaging control method having the above.

17. A program for causing a computer to execute the imaging control method according to claim 16.

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