WO2019225204A1

WO2019225204A1 - Radiographic device, radiographic system, radiographic method, and program

Info

Publication number: WO2019225204A1
Application number: PCT/JP2019/015985
Authority: WO
Inventors: 広紀須田
Original assignee: キヤノン株式会社
Priority date: 2018-05-25
Filing date: 2019-04-12
Publication date: 2019-11-28
Also published as: JP2019202078A

Abstract

A radiographic device according to the present invention is provided with a generating unit for generating a material discrimination image indicating a distribution for a plurality of materials included in radiographs captured at different radiation energies, and a frame extraction unit for determining statistical information relating to a specific material frames constituting the material discrimination image and extracting a frame on the basis of the statistical information.

Description

Radiographic apparatus, radiographic system, radiographic method and program

The present invention relates to a radiation imaging apparatus, a radiation imaging system, a radiation imaging method, and a program.

Generally, in a radiography system that supports moving images, only the portions necessary for diagnosis are stored in order to save the amount of data at the time of storage. In Patent Document 1, a frame to be stored in a radiographic image (for example, a frame in which a contrast medium is reflected in an examination using a contrast medium) is automatically extracted based on a change in pixel information at a specific position. Technology is shown.

Japanese Patent Laid-Open No. 1-209577

However, in the method of measuring the change in pixel information at a specific position, when attention is paid to the pixel information at a specific position in the frame, the luminance is high because it is originally high or because a substance of interest such as a contrast medium is reflected. It may not be possible to determine.

The present invention provides a technique capable of extracting a frame containing a target substance.

A radiation imaging apparatus according to an aspect of the present invention has the following configuration. That is,
The radiographic apparatus includes a generation unit that generates a substance identification image indicating a distribution of a plurality of substances included in a radiographic image captured with different radiation energies,
Extraction means for obtaining statistical information on a specific substance for each frame constituting the substance identification image and extracting a frame based on the statistical information.

According to the present invention, it is possible to provide a technique capable of extracting a frame containing a target substance.

Other features and advantages of the present invention will become apparent from the following description with reference to the accompanying drawings. In the accompanying drawings, the same or similar components are denoted by the same reference numerals.

The accompanying drawings are included in the specification, constitute a part thereof, show an embodiment of the present invention, and are used to explain the principle of the present invention together with the description.
The figure which illustrates the function structure of the radiography system in 1st Embodiment. The flow of processing from shooting to generation of a DICOM image is shown. The figure which illustrates the effective atomic number of a substance. (The figure which illustrates the correspondence of the attenuation coefficient (mass attenuation coefficient) of each substance and the energy component of a radiation. The figure which shows the flow of the frame extraction process in 1st Embodiment. The figure explaining the determination method of the extraction range of the frame in 1st Embodiment. The figure which shows the flow of the frame extraction process in 2nd Embodiment. The figure explaining the determination method of the extraction range of the frame in 2nd Embodiment. The figure which illustrates the functional structure of the radiography system in 3rd Embodiment. The figure which illustrates the structure of the display part which the display control part in 3rd Embodiment controls display. The figure which shows the flow of the frame extraction process in 3rd Embodiment. The figure which shows the structural example of the timeline display area which the display control part in 4th Embodiment performs display control. It is a figure which shows the structural example of the image display area which the display control part in 5th Embodiment performs display control.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the components described in this embodiment are merely examples, and are not limited by the following individual embodiments. The radiation includes α rays, β rays, γ rays, and various particle rays in addition to X-rays.

In the following embodiment, a radiation imaging system that includes a radiation generation device and a radiation imaging device and can generate an energy subtraction image will be described. In the radiation imaging systems of the following embodiments, moving image capturing will be described as an example of capturing a radiation image.

[First Embodiment]
(Configuration of radiation imaging system 100)
In the radiographic system 100 according to the present embodiment, a plurality of radiographic images with different radiation energies applied to the subject are processed to obtain new images (for example, soft tissue images such as muscles of the subject, distribution of bones, and the like). It is possible to use an energy subtraction method for obtaining a substance identification image showing

FIG. 1 is a diagram illustrating a functional configuration of the radiation imaging system 100 according to the first embodiment. The radiation imaging system includes a radiation generator 11 and a radiation imaging apparatus 10.

When imaging by the energy subtraction method is performed, a plurality of radiographic images captured with different radiation energies are required to generate one subtraction image. In order to acquire a plurality of radiation images photographed with different radiation energies, the radiation imaging apparatus 10 of the radiation imaging system 100 performs sampling a plurality of times during one frame imaging period, An image by high energy radiation (high energy image) and an image by low energy radiation (low energy image) are generated. Thereby, the radiation imaging apparatus 10 can acquire a plurality of energy images, for example, a high energy image and a low energy image for each frame in one frame period.

The radiation imaging apparatus 10 of the present embodiment includes a radiation imaging unit 101, an image acquisition unit 102, a substance decomposition unit 103, an image generation unit 104, a frame extraction unit 105, an image communication unit 106, and a display control unit 107 as functional configurations. .

In the radiation imaging apparatus 10, the radiation imaging unit 101 includes, for example, a flat panel detector (FPD), and receives radiation irradiated from the radiation generation apparatus 11 and captures a radiation image as radiation energy intensity distribution information. .

When receiving an imaging start instruction from the display control unit 107 having a user interface (UI), the radiation imaging unit 101 receives radiation irradiated at a predetermined interval by the radiation generation device 11 and captures a radiation image.

The radiation imaging unit 101 can accumulate a plurality of pieces of radiation distribution information based on the radiation emitted from the radiation generator 11. For example, by controlling the sampling hold signal, the radiation distribution information (XL) accumulated during the first sampling time from the start of radiation irradiation is sampled and held, and accumulated during the second sampling time longer than the first sampling time. The received radiation distribution information (XH) is sampled and held.

That is, two different energies (XL, XH) are accumulated by one irradiation. The energy XL is radiation energy lower than the energy XH and is used to generate a low energy image, and the energy XH is used to generate a high energy image. A plurality of energy images, for example, a high energy image and a low energy image can be acquired for each frame by performing sampling a plurality of times during one frame shooting period.

In order to generate one frame of a radiation moving image (radiation image), the radiation imaging unit 101 captures, for example, a high energy image and a low energy image as a plurality of energy images for each frame, and the captured radiation image (low energy) Image, high energy image) is output to the image acquisition unit 102.

The image acquisition unit 102 acquires the radiation image generated by the radiation imaging unit 101 for each image. For example, when radiography is performed with two different radiation energies, a high energy image and a low energy image are acquired for generating one frame, and the acquired images (a high energy image and a low energy image) are subjected to material decomposition. Output to the unit 103.

Since the attenuation coefficient of each substance corresponding to each energy level of radiation is known, using the known attenuation coefficient, the substance decomposing unit 103 uses the energy subtraction method to extract two from the high energy image 21 and the low energy image 22. The effective atomic number and areal density can be obtained by establishing an equation and finding the solution. Here, the effective atomic number indicates the atomic number corresponding to the average of the constituent elements of an element, compound, or mixture, and the atomic number of a hypothetical element that attenuates photons at the same rate as that substance. It is the quantitative index shown.

FIG. 3A is a diagram illustrating an effective atomic number (data table) of a substance used for generating a substance identification image in the substance decomposing unit 103. FIG. 3B is a diagram illustrating the correspondence (data diagram) between the attenuation coefficient (mass attenuation coefficient) of each substance and the energy component (single wavelength) of radiation. Information indicating the correspondence relationship (data table, data diagram) of FIGS. 3A and 3B is stored in advance in the storage unit 109 (internal memory) of the radiation imaging apparatus 10, and the material discrimination process of the energy subtraction method is executed. In doing so, the substance can be discriminated by referring to the data table of FIG. 3A.

The substance decomposing unit 103 (generating unit) generates a substance identification image indicating distributions of a plurality of substances included in radiographic images taken with different radiation energies. The substance decomposition unit 103 generates a substance identification image indicating the distribution of the specific substance corresponding to the effective atomic number from the effective atomic number and the surface density acquired by the substance discrimination process of the energy subtraction method, and the generated substance identification image is displayed as an image. The data is output to the generation unit 104 and the frame extraction unit 105. The substance identification image may be generated based on the effective atomic number or the surface density of the substance.

The image generation unit 104 generates a diagnostic image based on the substance identification image. That is, the image generation unit 104 generates a display processing image (diagnosis image) based on the substance identification image generated for each of the plurality of substances. The image generation unit 104 generates, as a display processing image (diagnostic image), an image that emphasizes a specific substance among a plurality of substances based on one energy component of radiation. Here, the display processing image includes a virtual monochromatic radiation image described below. Although the radiation irradiated from the radiation generator 11 includes a plurality of energy components, the image generation unit 104 includes a radiation image (virtual monochromatic radiation image) based on any one of the plurality of energy components. Is generated based on the substance identification image.

When the energy component (single wavelength) of radiation is selected, the attenuation coefficient of each substance corresponding to the selected energy component (single wavelength) can be obtained from the data diagram of FIG. 3B. Since the attenuation coefficient of the substance corresponding to each energy component of radiation is known (FIG. 3B), the pixel value distribution in an arbitrary energy component can be obtained by combining the known attenuation coefficient and the acquired substance identification image. Is required. The image generation part 104 can generate | occur | produce the image which shows distribution of the pixel value in arbitrary energy components as a virtual monochromatic radiation image at the time of irradiating with a virtual monochromatic radiation.

The energy component for generating the virtual monochromatic radiation image can be arbitrarily selected. For example, the image generation unit 104 combines the attenuation coefficient corresponding to the energy component set by the operator and the substance identification image. Thus, it is possible to acquire the distribution of pixel values in the set energy component and generate it as a diagnostic image (virtual monochromatic radiation image).

Since the operator is familiar with the image of a specific energy component according to the purpose of the inspection / diagnosis, it is possible to generate a diagnostic image (virtual monochromatic radiation image) corresponding to the energy component set by the operator. It is possible to provide an easy-to-view image display for the operator.

Since the energy component of the radiation that shows a peak in the radiation absorption rate differs from material to material, the diagnostic material emphasizes the specific material identified by creating a monochromatic radiation image of the energy component that maximizes the radiation absorption rate of the specific material. Images can be generated. Based on the data diagram of FIG. 3B, an attenuation coefficient corresponding to an energy component that emphasizes the specific substance is acquired, and the specific substance is emphasized by combining the acquired attenuation coefficient and the substance identification image. The distribution of pixel values in the energy component can be acquired and generated as a diagnostic image (virtual monochromatic radiation image).

In the storage unit 109 (internal memory) of the radiation imaging apparatus 10, information indicating the correspondence (data table, data diagram) of FIGS. 3A and 3B is stored, and the data table (FIG. 3A) is stored in the substance discrimination processing. Each substance can be discriminated by referring to it, and a virtual monochromatic radiation image corresponding to an arbitrary energy component can be generated by referring to a data diagram (see FIG. 3B).

Note that the substance decomposition unit 103 and the image generation unit 104 acquire the correspondence relationship between the data table and the data diagram through communication with an external device via the image communication unit 106, and identify the substance discrimination and virtual monochromatic radiation image. It is also possible to generate.

The diagnostic image is not limited to the virtual monochromatic radiation image, and the image generation unit 104 generates an image (average energy image) obtained by averaging the pixel values of the high energy image and the low energy image described above as the diagnostic image. It is also possible.

The image generation unit 104 outputs the generated diagnostic image (virtual monochromatic radiation image or average energy image) to the display control unit 107.

The frame extraction unit 105 (extraction unit) obtains statistical information about a specific substance for each frame constituting the substance identification image, and extracts a frame based on the statistical information. For example, the frame extraction unit 105 obtains statistical information (for example, the content rate of each substance) indicating the ratio of a specific substance for each frame constituting the substance identification image, The extracted image is generated by extracting the frame to be obtained from the frame constituting the display processing image generated based on the substance identification image. The frame extraction unit 105 extracts a frame corresponding to a frame whose statistical information has a certain ratio or more from the frames constituting the display processing image, and generates an extracted image.

For statistical information, in addition to acquiring the content of each substance based on the substance identification image, it is also possible to use an image showing the distribution of effective atomic numbers obtained by substance discrimination processing of the energy subtraction method. . For example, in each frame, the ratio (content ratio) that the substance specified by the effective atomic number occupies the frame may be obtained.

The frame extraction unit 105 acquires statistical information used for frame extraction based on the substance identification image, and extracts a frame from the diagnostic image (virtual monochromatic radiation image or average energy image) based on the acquired statistical information. . The frame extraction unit 105 acquires, for example, pixel value information indicating luminance and density from the substance identification image acquired from the substance decomposition unit 103 as statistical information, and compares the statistical information with a threshold value to determine the specified substance. A frame including statistical information equal to or greater than a threshold is specified.

Further, the frame extraction unit 105 extracts a frame having the same frame number as the frame specified based on the substance identification image from the diagnostic image (virtual monochromatic radiation image or average energy image) acquired from the image generation unit 104. Extract and generate a multi-frame image defined by DICOM (Digital Imaging and COmmunications in Medicine) as a DICOM image. The frame extraction unit 105 uses a DICOM image (based on the DICOM standard) based on an extracted image extracted from a frame that constitutes a display processing image generated based on the substance identification image. Saved image). The frame extraction unit 105 extracts a frame corresponding to a frame whose statistical information has a certain ratio or more from the frames constituting the display processing image, and generates an extracted image.

The image communication unit 106 is configured to be able to communicate with an external device via a network. The frame information extracted by the frame extraction unit 105 and the generated DICOM image are transferred to a PACS (Picture Archive Communication System) 12. Send. When an operator's instruction from the display control unit 107 is input to the image communication unit 106 such as the end of inspection, the image communication unit 106 acquires the DICOM image extracted from the frame extraction unit 105 and conforms to the DICOM standard. Is transmitted to the PACS 12 using the protocol described above. For example, the image communication unit 106 can also transmit information about the subject, imaging conditions, and the like to the PACS 12 as supplementary information of the DICOM image.

The PACS 12 can receive and store the DICOM image file from the image communication unit 106 and display the DICOM image for diagnosis. By transmitting an image obtained by extracting a frame containing a specific substance of interest in a radiographic image to the PACS 12 as storage data, the data amount at the time of storage is saved, and pixel information (for example, luminance) at a specific position is saved. It is possible to accurately extract a frame in which a substance of interest in a radiographic image is included in a radiation image at a threshold value or more, regardless of the measurement result of the change in the pixel value such as the density and the pixel value.

The display control unit 107 performs display control for displaying a radiation image on the display unit. When the display control unit 107 receives a generation notification indicating completion of image generation for the diagnostic image from the image generation unit 104, the display control unit 107 displays the diagnostic image (virtual monochromatic radiation image) from the image generation unit 104. Or an average energy image) is acquired and displayed on the display unit. The display unit may be provided as a configuration of the radiation imaging apparatus 10 or may be an external configuration of the radiation imaging apparatus 10.

(Processing sequence)
FIG. 2 is a sequence diagram showing a flow of processing from the radiographic image capturing to the generation of an image (DICOM image) corresponding to the DICOM standard in the first embodiment. In this sequence diagram, a plurality of different energy images captured by the radiation imaging unit 101 are decomposed into a plurality of substance identification images, and a diagnostic image (in this example, a virtual monochromatic radiation image) is generated and output to the PACS 12. The flow of a process until the DICOM image for this is produced | generated is shown.

In step S201, the radiation imaging unit 101 captures the high energy image 21 and the low energy image 22 as a plurality of energy images for each frame in order to generate one frame of the radiation image, and the captured high energy image 21 and The low energy image 22 is output to the image acquisition unit 102.

In step S <b> 202, the image acquisition unit 102 acquires the high energy image 21 and the low energy image 22 captured by the radiation imaging unit 101, and outputs the acquired plurality of energy images to the substance decomposition unit 103.

In step S203, the substance decomposition unit 103 generates a substance identification image from the high energy image 21 and the low energy image 22 by the energy subtraction method. For example, the substance decomposing unit 103 includes a substance identification image for each substance constituting the human body such as water, bone, and fat (hereinafter, the substance identification image for each substance is collectively referred to as “human body density image 23”), blood vessel A substance identification image (for example, a contrast medium density image 24) is generated for the contrast medium injected into. The human body density image 23 and the contrast medium density image 24 are used in the display process 2001 and the frame extraction process 2002.

In FIG. 2, display processing 2001 is processing for generating a diagnostic image based on the substance identification image and displaying the generated image. The frame extraction process 2002 is a process for extracting a frame including a specific substance based on the substance identification image and generating a DICOM image based on the extracted frame.

(Display process 2001)
First, in step S <b> 204 of the display process 2001, the substance decomposition unit 103 outputs the generated human body density image 23 and the contrast agent density image 24 to the image generation unit 104.

Next, in step S205, the image generation unit 104 generates a virtual monochromatic radiation image 25 as a diagnostic image. If the high energy image 21 and the low energy image 22 are discriminated into a human body density image 23 and a contrast medium density image 24 which are substance identification images, the effective atomic number and attenuation coefficient of each substance and contrast medium constituting the human body are known. Therefore, the virtual monochromatic radiation image 25 can be generated for the radiation energy component (single wavelength) corresponding to the attenuation coefficient.

In step S206, the image generation unit 104 notifies the display control unit 107 of image generation. When the generation processing of the diagnostic image is completed, the image generation unit 104 outputs a generation notification indicating the completion of image generation to the display control unit 107.

Next, in step S207, the display control unit 107 acquires the virtual monochromatic radiation image 25 from the image generation unit 104 and displays it. In this step, when a generation notification indicating completion of image generation for a diagnostic image is input from the image generation unit 104, the display control unit 107 displays a diagnostic image (virtual monochromatic radiation image, Alternatively, an average energy image) is acquired and displayed on the display unit.

(Frame extraction process 2002)
First, in step S208 of the frame extraction process 2002, the substance decomposing unit 103 transmits the generated substance identification image (for example, the human body density image 23 and the contrast agent density image 24) to the frame extracting unit 105.

Next, in step S209, the frame extraction unit 105 executes a frame extraction process. In this step, the frame extraction unit 105 acquires statistical information used for frame extraction based on the substance identification image, and extracts a frame based on the acquired statistical information. The frame extraction unit 105 identifies a frame in which the statistical information of the designated substance is included in the threshold value or more by comparing the statistical information acquired from the substance identification image with the threshold value.

Next, in step S210, the frame extraction unit 105 acquires the virtual monochromatic radiation image 25 from the image generation unit 104 and creates a DICOM image. The frame extraction unit 105 acquires a frame having the same frame number as the frame identified based on the substance identification image from a diagnostic image (for example, a virtual monochromatic radiation image) acquired from the image generation unit 104, and is defined by DICOM. The generated multi-frame image is generated as a DICOM image.

FIG. 4 is a diagram showing a flow of the frame extraction process 2002 of the frame extraction unit 105 in the first embodiment.

The substance decomposition unit 103 transmits the generated substance identification image (the human body density image 23 and the contrast medium density image 24) to the frame extraction unit 105, and the frame extraction unit 105 performs a frame extraction process according to the following processing flow.

First, in step S401, the frame extraction unit 105 measures how much substance to be extracted is included for each frame from the substance identification image obtained from the substance decomposition unit 103. Specifically, the frame extraction unit 105 calculates the sum of the pixel values of the substance identification image in the irradiation field irradiated with radiation. Here, the pixel value is a value from 0.0 to 1.0. If the substance is not included in the frame, the pixel value is 0.0. If the substance is included in the frame, the pixel value is The value is greater than 0.0 and less than or equal to 1.0. The total pixel value in the frame also increases as the amount of the substance is increased. That is, the pixel value of the frame of the substance identification image increases as the substance is included in the frame.

In step S402, the frame extraction unit 105 obtains, as statistical information, the result of dividing the sum of the pixel values of the substance identification image in the irradiation field irradiated with radiation from the substance identification image by the number of pixels of the irradiation field for each frame. get. The frame extraction unit 105 divides the total pixel value in the frame obtained in step S401 by the number of pixels in the irradiation field, and calculates statistical information (content ratio of the substance to be extracted) of each substance. By calculating the content ratio divided by the number of pixels in the irradiation field without directly handling the total number of pixels, it is possible to cope with cases where the resolution of the radiation imaging unit 101 is different.

Next, in step S403, the frame extraction unit 105 compares a specified substance, for example, statistical information such as a contrast agent, with a threshold value, and includes a frame that includes the statistical information of the specified substance at a threshold value or more. Identify. The frame extraction unit 105 extracts a frame in which the content rate of the substance is included in a certain threshold or more, and sets a range determined by a series of frames included in the certain threshold or more as a frame extraction range. The frame extraction unit 105 generates a frame list of the extraction range based on the frames included in the extraction range.

In step S404, the frame extraction unit 105 acquires a display processing image generated based on the substance identification image. For example, the frame extraction unit 105 acquires the virtual monochromatic radiation image 25 generated by the image generation unit 104 as the display processing image.

Next, in step S405, the frame extraction unit 105 extracts a virtual monochromatic radiation image frame corresponding to the frame list of the extraction range generated in step S403, and creates a multi-frame image defined by DICOM for each extraction range. Generated as a DICOM image. The frame list of the extraction range includes frame number information in the radiographic image as frame information for specifying the frame, and the frame extraction unit 105 has the same frame number as the frame specified based on the substance identification image. Is acquired from a diagnostic image (virtual monochromatic radiation image), and a DICOM image is generated based on the acquired frame. For example, if there are a plurality of extraction ranges in the radiographic image, the frame extraction unit 105 generates a plurality of DICOM images for each extraction range.

Then, the frame extraction unit 105 stores the radiation image and index information indicating the extraction range for each substance with respect to the radiation image in the storage unit 109 in combination. By referring to this index information, it is possible to search a range in which a frame is extracted for each substance in a radiographic image and regenerate a diagnostic image based on the radiographic image stored in the storage unit 109. Become.

FIG. 5 is a diagram for explaining a frame extraction range determination method in step S403 in FIG. In FIG. 5, the horizontal axis represents time, and the content rate of the substance to be extracted in each frame is indicated by hatching. For example, the frame 501 indicates that the content rate of the substance to be extracted is equal to or greater than a threshold value.

The frame extraction unit 105 extracts a frame including statistical information that is greater than or equal to a certain threshold value from the frames constituting the substance identification image, and sets a series of frames that are equal to or greater than the threshold value as an extraction range. Then, the frame extraction unit 105 extracts a frame corresponding to the extraction range from the frames constituting the display processing image. First, the frame extraction unit 105 identifies a frame in which the statistical information of the substance (the content rate of the substance to be extracted) is included more than a threshold. The frame extraction unit 105 extracts a frame in which the content rate of the substance is equal to or greater than a certain threshold, and sets a series of frames that are equal to or greater than the threshold as an extraction range. In the case of the distribution of the content rate as shown in FIG. 5, the extraction range 502 and the extraction range 503 are extracted, and the frame extraction unit 105 generates and holds a frame list of the extraction range based on the frames included in the extraction range. To do. Frames that do not exceed the threshold are not extracted.

According to the present embodiment, it is possible to extract a frame containing a material of interest in a radiographic image. Using material discrimination technology of the energy subtraction method, statistical information (content ratio of the extraction target substance) of the specified substance is acquired for each frame, and frames above the threshold are extracted and extracted as frames necessary for diagnosis. By sending an image based on the frame to the PACS as data for storage, the data amount at the time of storage is saved, and the measurement result of changes in pixel information (for example, pixel values such as luminance and density) at a specific position is saved. Regardless, it is possible to accurately extract a frame in which a target substance is included in the radiographic image for a threshold value or more.

(Second Embodiment)
In the first embodiment, a series of frames including the statistical information of substances (content ratio of substances to be extracted) equal to or more than a threshold is specified as the extraction range. However, in the present embodiment, A configuration in which the range defined by the first frame and the last frame in which the statistical information of the substance (content ratio of the substance to be extracted) is equal to or greater than the threshold is specified as the extraction range will be described.

The configuration of the radiation imaging system 100 in the second embodiment is the same as that in the first embodiment (FIG. 1). In the second embodiment, the frame extraction unit 105 performs processing according to the processing flow shown in FIG. FIG. 6 is a diagram illustrating a flow of the frame extraction process 2002 of the frame extraction unit 105 in the second embodiment, and the frame extraction process 2002 is a process corresponding to the process sequence described in FIG. 2 of the first embodiment.

In step S601, the frame extraction unit 105 measures how much of the substance to be extracted is included for each frame from the substance identification image obtained from the substance decomposition unit 103. The frame extraction unit 105 calculates the sum of the pixel values of the substance identification image in the irradiation field irradiated with radiation. Here, the pixel value is a value from 0.0 to 1.0. If the substance is not included in the frame, the pixel value is 0.0. If the substance is included in the frame, the pixel value is The value is greater than 0.0 and less than or equal to 1.0.

In step S602, the frame extraction unit 105 divides the sum of the pixel values in the frame obtained in step S601 by the number of pixels in the irradiation field, and calculates statistical information (content ratio of the substance to be extracted) of each substance. .

Next, in step S603, the frame extraction unit 105 includes the statistical information of the specified substance that exceeds the threshold by comparing the statistical information of the substance specified as the extraction target (content ratio of the extraction target substance) with the threshold. Identify the frame to be played. The frame extraction unit 105 extracts frames that include a substance content rate equal to or greater than a certain threshold value, and generates a frame list based on the extracted frames.

In step S604, the frame extraction unit 105 sets a range determined by the first frame number and the last frame number in the frame list as one extraction range. That is, the frame extraction unit 105 identifies the first frame number and the last frame number from the frame list generated in step S603, and sets a range between frames determined by the first frame number and the last frame number. Set as one extraction range. Then, the frame extraction unit 105 sets all frames within the extraction range as extraction target frames. In this step, even if the statistical information of the substance (content ratio of the substance to be extracted) is less than the threshold in the extraction range, it is set as the frame to be extracted.

In step S605, the frame extraction unit 105 acquires a display processing image generated based on the substance identification image. For example, the frame extraction unit 105 acquires the virtual monochromatic radiation image 25 generated by the image generation unit 104 as the display processing image.

In step S606, the frame extraction unit 105 extracts a virtual monochromatic radiation image frame corresponding to the frame in the extraction range set in step S604, and generates a multi-frame image defined by DICOM as a DICOM image. . The frame extraction unit 105 acquires a frame having the same frame number as the frame of the set extraction range from a diagnostic image (virtual monochromatic radiation image), and generates a DICOM image based on the acquired frame.

In the first embodiment, if there are a plurality of extraction ranges in the radiographic image, the frame extraction unit 105 generates a plurality of DICOM images for each extraction range. In this embodiment, the frame extraction unit 105 Of the radiographic image frames, the range defined by the first frame and the last frame where the statistical information of the substance (content rate of the substance to be extracted) is equal to or greater than the threshold is defined as one extraction range, and the frames within the extraction range One DICOM image is generated based on the above.

FIG. 7 is a diagram for explaining a frame extraction range determination method in step S604 of FIG. In FIG. 7, the horizontal axis represents time, and the content rate of the substance to be extracted in each frame is indicated by hatching. The frame extraction unit 105 sets, as one extraction range, a range determined by a first frame in which statistical information is greater than or equal to a threshold and a last frame in which the statistical information is greater than or equal to the threshold. The frame extraction unit 105 extracts a frame corresponding to the extraction range from the frames constituting the display processing image. For example, in the case of the distribution of the statistical information (content ratio of the substance to be extracted) as shown in FIG. 7, the extraction range 703 has the first frame 701 that is equal to or higher than the threshold as the start point and the last frame 702 that is equal to or higher than the threshold as the end point. Is set as one extraction range. That is, the frame number (first frame number) of the first frame 701 in which the statistical information (content ratio of the substance to be extracted) is equal to or greater than the threshold, and the frame number (last frame number) of the last frame 702 that is equal to or greater than the threshold. A range between frames determined by the above is set as one extraction range 703.

The frame extraction unit 105 sets all the frames in the extraction range 703 as extraction target frames, and even if the substance statistical information (content ratio of the extraction target substance) is less than the threshold in the extraction range 703, the extraction is performed. Extracted as the target frame.

According to the present embodiment, it is possible to extract a frame containing a material of interest in a radiographic image. Using the material discrimination technology of the energy subtraction method, statistical information on the substance specified in advance (content ratio of the extraction target substance) is acquired for each frame, and the statistical information on the substance (of the extraction target in the radiographic image frame) is acquired. For the purpose of saving images based on the extracted frames while maintaining the continuity between the frames to be extracted, with the range defined by the first frame and the last frame having a substance content ratio) equal to or greater than the threshold as the extraction range By transmitting to the PACS 12 as data, it is possible to save the amount of data at the time of storage, and regardless of the measurement result of the change in pixel information at a specific position, a frame in which a substance of interest in the radiation image is included above the threshold value, It becomes possible to extract accurately.

(Third embodiment)
In the first embodiment and the second embodiment, frames are extracted based on the condition that the statistical information of the specific substance (content ratio of the substance to be extracted) is equal to or greater than the threshold by using the material discrimination technique of the energy subtraction method. The configuration to be described has been described. In the third embodiment, a configuration in which information of a plurality of substances included in a radiographic image is displayed on a display unit and a specific substance for extracting a frame is designated will be described.

FIG. 8 is a diagram illustrating a functional configuration of the radiation imaging system 100 according to the third embodiment. The configuration of the radiation imaging system 100 including the radiation generation device 11 and the radiation imaging device 10 is the same as that of the first embodiment (FIG. 1). The same functional blocks as those in the radiation imaging apparatus 10 (FIG. 1) are denoted by the same reference numerals.

FIG. 9 is a diagram illustrating a configuration of a display unit in which the display control unit 801 according to the third embodiment performs display control. The display control unit 801 displays an image display area 901 for displaying a display processed image (diagnosis image), and a timeline display area 902 for displaying statistical information in each frame in a graph according to the radiographic image capturing time. Display on the screen. When a generation notification indicating completion of image generation for a diagnostic image is input from the image generation unit 104 to the display control unit 801, a diagnostic image (virtual monochromatic radiation image or average energy) is input from the image generation unit 104. Display) is acquired and displayed in the image display area 901 (FIG. 9) of the display unit.

In addition, the display control unit 801 acquires, from the frame extraction unit 105, statistical information of each substance (content ratio of the extraction target substance) and information on the extraction range of the frame for each frame, and displays the acquired information on the display unit. Display control is performed in the timeline display area 902 (FIG. 9). Based on the control of the display control unit 801, the timeline display area 902 displays statistical information (content ratio of the substance to be extracted) for each substance frame, and the operator can select the extraction target for frame extraction. It functions as a user interface that can specify substances. In the timeline display area 902, the operator can designate a substance from which a frame is extracted, and the designated statistical information indicating the designated substance is transmitted to the frame extraction unit 105. The timeline display area 902 includes a substance list display unit 903, a statistical information graph display unit 904, a frame extraction range display unit 905, and a reproduction position display unit 906.

The frame extraction unit 105 obtains statistical information about a specific substance designated by the display control unit 801 for each frame constituting the substance identification image, and extracts a frame based on the statistical information. For example, the frame extraction unit 105 obtains statistical information (for example, the content rate of each substance) indicating the ratio of the specified specific substance for each frame constituting the substance identification image, and the statistical information is equal to or greater than a certain level. The extracted image is generated by extracting the frame having the ratio of (2) from the frames constituting the display processing image generated based on the substance identification image. The frame extraction unit 105 extracts a frame corresponding to a frame whose statistical information has a certain ratio or more from the frames constituting the display processing image, and generates an extracted image.

The substance list display unit 903 has a substance name list indicating the names of substances and a substance designating part for designating substances to be extracted. The display control unit 801 displays a substance name list of substances acquired from the frame extraction unit 105 on the substance list display unit 903. The substance list display unit 903 displays a check box as a substance designating part for designating a substance to be extracted. When the operator inputs a check box, the input substance is used as a substance to be extracted in the frame. It is specified. The display control unit 801 transmits designated statistical information indicating the designated substance to the frame extracting unit 105. The frame extraction unit 105 acquires a frame extraction range for the substance designated by the substance designation unit, and extracts an extracted image obtained by extracting a frame corresponding to the extraction range from the frames constituting the display processing image (diagnosis image). Generate.

The display control unit 801 displays a graph of the statistical information (content rate of the substance to be extracted) of each substance acquired from the frame extraction unit 105 on the statistical information graph display unit 904. The display control unit 801 displays a substance name list indicating the name of the substance and a substance designating part for designating the substance to be extracted side by side with respect to the graph display of the statistical information graph display unit 904. By such display control, the operator can grasp each substance name and a graph of statistical information (content ratio of a substance to be extracted) in a visual association.

Also, the display control unit 801 displays the extraction range of frames in which the statistical information has a certain ratio or more on the graph display of the statistical information graph display unit 904. That is, the display control unit 801 displays the frame extraction range (the frame extraction range display unit 905) acquired from the frame extraction unit 105 on the graph display of the statistical information graph display unit 904. In FIG. 9, the frame extraction range display unit 905 is indicated by hatching, and such display control allows the operator to visually identify the distribution of the extraction range in the entire frame.

When the operator presses the playback button 920 in the timeline display area 902, the display control unit 801 performs video playback of the diagnostic image displayed in the image display area 901, and when the operator presses the stop button 930. It is possible to perform display control so as to stop moving image playback. The display control unit 801 displays a reproduction position display unit 906 indicating the reproduction position of the image displayed in the image display area 901 side by side with respect to each statistical information (content rate of substance to be extracted) graph. By such display control, it becomes possible to grasp the relationship between the reproduction position of the image and the content rate of each substance in a visually correlated manner. For example, when paying attention to statistical information (content ratio of a substance to be extracted) of a specific substance, the operator can quickly specify which frame (range) should be reproduced.

FIG. 10 is a diagram showing a flow of frame extraction processing of the frame extraction unit 105 in the third embodiment. In step S <b> 1001, the frame extraction unit 105 measures how many substances to be extracted are included for each frame from the substance identification image obtained from the substance decomposition unit 103. The frame extraction unit 105 calculates the sum of the pixel values of the substance identification image in the irradiation field irradiated with radiation. Here, the pixel value is a value from 0.0 to 1.0. If the substance is not included in the frame, the pixel value is 0.0. If the substance is included in the frame, the pixel value is The value is greater than 0.0 and less than or equal to 1.0.

In step S1002, the frame extraction unit 105 divides the sum of the pixel values in the frame obtained in step S1001 by the number of pixels in the irradiation field, and calculates statistical information (content ratio of the substance to be extracted) of each substance. .

In step S1003, the frame extraction unit 105 determines a substance name list indicating the names of the substances decomposed by the substance decomposition unit 103 by the energy subtraction method, statistical information (content ratio of substances to be extracted) of each substance, and each substance. The frame list of the obtained extraction range is transmitted to the display control unit 801.

Here, the frame extraction unit 105 can extract a frame in which the content rate of the substance is included in a certain threshold or more, and can set a series of frames in which the content is equal to or more than the threshold as the extraction range. The frame extraction unit 105 extracts one range determined by the frame number of the first frame in which the statistical information (content ratio of the extraction target substance) is equal to or greater than the threshold and the frame number of the last frame in which the statistical information is equal to or greater than the threshold. It can also be set as a range. The frame extraction unit 105 acquires an extraction range for each substance, and transmits a frame list of frames included in the acquired extraction range to the display control unit 801.

The display control unit 801 performs display control in the timeline display area 902 based on the information acquired from the frame extraction unit 105. In the timeline display area 902, the operator can designate a substance from which a frame is extracted, and the display control unit 801 transmits designated statistical information indicating the designated substance to the frame extraction unit 105.

Next, in step S1004, the frame extraction unit 105 identifies the substance corresponding to the specified statistical information received from the display control unit 801 as the extraction target substance. The frame extraction unit 105 acquires a frame list of the extraction range for the specified substance.

In step S1005, the frame extraction unit 105 acquires a display processing image generated based on the substance identification image. For example, the frame extraction unit 105 acquires the virtual monochromatic radiation image 25 generated by the image generation unit 104 as the display processing image.

In step S1006, the frame extraction unit 105 extracts a virtual monochromatic radiation image frame corresponding to the frame list of the extraction range acquired in step S1004, and generates a multiframe image defined by DICOM as a DICOM image. . The frame extraction unit 105 acquires a frame having the same frame number as the frame of the set extraction range from a diagnostic image (virtual monochromatic radiation image), and generates a DICOM image based on the acquired frame.

According to the present embodiment, it is possible to extract a frame containing a material of interest in a radiographic image.

In addition, using the energy subtraction material discrimination technology, based on the statistical information (content rate of the substance to be extracted) of each substance displayed on the screen, the extraction range frame for the substance specified by the operator is diagnosed. By extracting the frames based on the extracted frames and transmitting the images based on the extracted frames to the PACS as storage data, the amount of data during storage can be saved. In addition, it is possible to accurately extract a frame that contains a substance of interest in a radiographic image that exceeds a threshold value, regardless of the measurement result of changes in pixel information at a specific position (for example, pixel values such as luminance and density). become.

(Fourth embodiment)
In the fourth embodiment, display control of the timeline display area by the display control unit 801 described in the third embodiment will be described. FIG. 11 is a diagram illustrating a configuration example of a timeline display area 1100 in which the display control unit 801 according to the fourth embodiment performs display control. The timeline display area 1100 includes a threshold value changing unit 1101 in addition to the timeline display area 902 of FIG.

The threshold value changing unit 1101 displays the setting of the threshold value used in the comparison process with the statistical information (the content rate of the substance to be extracted). The display control unit 801 displays the threshold value used in the comparison process with the statistical information. A threshold value changing unit 1101 for displaying the setting is displayed on the display unit. In the display of the threshold changing unit 1101, the display control unit 801 displays the threshold setting display by the threshold changing unit 1101 on the graph display of the statistical information graph display unit 904.

The display control unit 801 changes the set threshold based on the change in the display position of the threshold change unit 1101. The display control unit 801 can change the display position of the threshold change unit 1101 up and down based on an operator's change operation via an input unit such as a mouse. By changing the display position of the threshold value changing unit 1101, the set threshold value is changed. When the currently set threshold is changed, the display control unit 801 transmits the changed new threshold to the frame extraction unit 105.

The frame extraction unit 105 performs comparison processing with statistical information based on the changed threshold value, and constitutes a display processing image generated based on the substance identification image, in which the statistical information has a ratio of a certain level or more. An extracted image extracted from is generated. Based on the threshold value transmitted from the display control unit 801, the frame extraction unit 105 performs a comparison process between the statistical information (content ratio of the substance to be extracted) and the changed threshold value. The frame extraction unit 105 extracts frames in which the statistical information (content rate of the extraction target substance) is greater than or equal to the changed threshold, and sets a series of frames that are greater than or equal to the threshold as the extraction range. In addition, the frame extraction unit 105 determines the range in which the statistical information (content rate of the substance to be extracted) is determined by the frame number of the first frame that is greater than or equal to the changed threshold and the frame number of the last frame that is greater than or equal to the threshold. Can be set as one extraction range.

The frame extraction unit 105 acquires an extraction range for each substance, and transmits a list of frames (frame list) included in the acquired extraction range to the display control unit 801. The display control unit 801 changes the display of the extraction range in the timeline display area 902 based on the extraction range frame list transmitted from the frame extraction unit 105. In FIG. 11, an extraction range 1102 and an extraction range 1103 are extraction ranges that have been changed based on the extraction range frame list transmitted from the frame extraction unit 105.

According to the present embodiment, the threshold value can be changed by the operator, and fine adjustment of the frame extraction is possible. By changing the display position of the displayed threshold value changing unit 1101, the setting of the threshold value can be arbitrarily changed. Based on the changed threshold value, statistical information (content ratio of the substance to be extracted) and the threshold value are changed. And comparison processing can be performed. The extraction range can be changed by comparing the changed threshold value with the statistical information. A frame necessary for diagnosis can be extracted by changing the extraction range. By transmitting an image based on the extracted frame to the PACS 12 as storage data, the amount of data at the time of storage can be saved.

(Fifth embodiment)
In the fifth embodiment, display control of an image display area by the display control unit 801 described in the third embodiment will be described. FIG. 12 is a diagram illustrating a configuration example of an image display area 1200 in which the display control unit 801 according to the fifth embodiment performs display control. The image display area 1200 includes an extraction area designation unit 1201 in addition to the image display area 901 of FIG.

The extraction area designation unit 1201 designates a pixel range for calculating statistical information (content rate of a substance to be extracted). That is, the extraction area designation unit 1201 designates a pixel range for obtaining the sum of pixel values of the substance identification image when the frame extraction unit 105 calculates statistical information (content ratio of the substance to be extracted).

The display control unit 801 causes the display unit to display an extraction area specification unit 1201 that specifies a pixel range for calculating statistical information, and the frame extraction unit 105 sets the pixel value of the image range specified by the extraction area specification unit 1201. Statistical information is acquired based on the information. In the display of the extraction area designation unit 1201, the display control unit 801 displays the pixel range designated by the extraction area designation unit 1201 on the display processing image (diagnosis image) displayed in the image display area 1200. Let

The display control unit 801 can change the display range of the extraction area designation unit 1201 based on an operator's designation operation via an input unit such as a mouse. By changing and setting the display range of the extraction area specifying unit 1201, the set pixel range is changed. The pixel range set as the initial value has the irradiation field as the pixel range, and if the change setting by the extraction area designation unit 1201 is not performed, the irradiation field that is the initial value setting is maintained as the pixel range. . When the operator designates a pixel range in which the pixel values are summed, an additional condition for extracting a frame necessary for diagnosis can be set.

When the currently set pixel range is changed, the display control unit 801 transmits the changed new pixel range to the frame extraction unit 105. The frame extraction unit 105 calculates statistical information (content ratio of the substance to be extracted) based on the changed pixel range transmitted from the display control unit 801.

The frame extraction unit 105 acquires, as statistical information, the result of dividing the sum of the pixel values of the substance identification image within the designated pixel range by the number of pixels in the pixel range from the substance identification image for each frame. First, the frame extraction unit 105 calculates the sum of the pixel values of the substance identification image in the changed pixel range for each frame. Then, the frame extraction unit 105 divides the sum of the pixel values in the frame by the number of pixels in the pixel range, and calculates statistical information (content ratio of the substance to be extracted) of each substance.

The frame extraction unit 105 can set the extraction range of the frame based on the comparison result between the statistical information (content rate of the substance to be extracted) calculated based on the changed pixel range and the threshold value. As a method for setting a frame extraction range, as described in the first embodiment, a series of frames in which statistical information (content ratio of a substance to be extracted) is equal to or greater than a threshold can be set as the extraction range. Further, as described in the second embodiment, the statistical information (the content rate of the substance to be extracted) is the frame number of the first frame that is equal to or greater than the threshold value, and the frame number of the last frame that is equal to or greater than the threshold value. It is also possible to set a fixed range as one extraction range.

The frame extracting unit 105 includes a substance name list indicating the names of the substances decomposed by the substance decomposing unit 103 by the energy subtraction method, statistical information of each substance calculated based on the changed pixel range (contains the contents of the substance to be extracted) The frame list of the extraction range obtained for each substance is transmitted to the display control unit 801. The display control unit 801 can perform display control of the timeline display area (902 in FIG. 9 and 1100 in FIG. 11) based on the information transmitted from the frame extraction unit 105.

According to this embodiment, by changing the display range of the displayed extraction area designating unit 1201, when calculating statistical information (content ratio of a substance to be extracted) for a region that the operator is paying attention to. The setting of the pixel range to be used can be arbitrarily changed, and a comparison process between the statistical information calculated based on the changed pixel range (content ratio of the substance to be extracted) and the threshold value can be performed. Based on the extraction range obtained from the result of the comparison process, it is possible to extract a frame necessary for the diagnosis with respect to the region focused by the operator. By transmitting an image based on the extracted frame to the PACS 12 as storage data, the amount of data at the time of storage can be saved.

(Other embodiments)
The present invention supplies a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in a computer of the system or apparatus read and execute the program This process can be realized. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

The present invention is not limited to the above embodiment, and various changes and modifications can be made without departing from the spirit and scope of the present invention. Therefore, in order to make the scope of the present invention public, the following claims are attached.

This application claims priority based on Japanese Patent Application No. 2018-1000086 filed on May 25, 2018, the entire contents of which are incorporated herein by reference.

10: Radiation imaging device, 11: Radiation generator, 12: PACS
101: Radiation imaging unit, 102: Image acquisition unit, 103: Substance decomposition unit,
104: Image generation unit, 105: Frame extraction unit, 106: Image communication unit,
107, 801: display control unit, 901: image display area,
902: Timeline display area, 903: Substance list display,
904: content rate graph display, 905: frame extraction range display,
906: Playback position display, 1100: Timeline display area,
1101: Threshold change unit, 1102, 1103: Extraction range 1200: Image display area, 1201: Extraction area designation unit

Claims

Generating means for generating a substance identification image showing a distribution of a plurality of substances included in a radiographic image taken with different radiation energies;
For each frame constituting the substance identification image, obtaining statistical information on a specific substance, extracting means for extracting a frame based on the statistical information;
A radiation imaging apparatus comprising:
The extraction means extracts a frame in which the statistical information is included in a certain threshold or more from frames constituting the substance identification image, and sets a series of frames in which the statistical information is over the threshold as an extraction range. The radiation imaging apparatus according to 1.
The extraction means sets, as one extraction range, a range determined by a first frame in which the statistical information is greater than or equal to a threshold value and a last frame in which the statistical information is greater than or equal to a threshold value among frames constituting the substance identification image. The radiographic apparatus according to claim 1, wherein
The extraction means obtains the statistical information indicating a ratio of a specific substance contained in each frame constituting the substance identification image, and based on the substance identification image, a frame in which the statistical information has a certain ratio or more. The radiation imaging apparatus according to claim 3, wherein an extracted image extracted from a frame constituting the display processing image generated in this way is generated.
The radiation imaging apparatus according to claim 4, wherein the extraction unit extracts a frame corresponding to the extraction range from a frame constituting the display processing image.
6. The radiation imaging apparatus according to claim 4, further comprising image generation means for generating the display processing image based on the substance identification image generated for each of the plurality of substances.
The radiation according to claim 6, wherein the image generation unit generates an image that emphasizes a specific substance among the plurality of substances as the display processing image based on one energy component of the radiation. Shooting device.
The radiation imaging apparatus according to claim 4, wherein the display processing image includes a virtual monochromatic radiation image.
9. The radiographic apparatus according to claim 4, wherein the extraction unit generates a DICOM image based on a DICOM standard based on the extracted image.
The extraction means acquires, as the statistical information, a result of dividing the sum of pixel values of the substance identification image in the irradiation field irradiated with the radiation by the number of pixels of the irradiation field for each frame from the substance identification image. The radiation imaging apparatus according to claim 1, wherein:
The said extraction means memorize | stores in a memory | storage means combining the said radiographic image and the index information which shows the extraction range for every said substance with respect to the said radiographic image in any one of Claim 1 thru | or 10 characterized by the above-mentioned. The radiation imaging apparatus described.
Generating means for generating a substance identification image showing a distribution of a plurality of substances included in a radiographic image taken with different radiation energies;
Display information on a plurality of substances included in the radiation image is displayed on a display means, and a display control means for designating a specific substance for extracting a frame;
For each frame constituting the substance identification image, extraction means for obtaining statistical information on the specified specific substance and extracting a frame based on the statistical information;
A radiation imaging apparatus comprising:
The display control means causes the display means to display a threshold value changing means for displaying a setting of a threshold value used in the comparison process with the statistical information,
The radiation imaging apparatus according to claim 12, wherein the display control unit changes a set threshold value based on a change in a display position of the threshold value changing unit.
The extraction means obtains the statistical information indicating a ratio of the specified specific substance included in each frame constituting the substance identification image, and determines a frame in which the statistical information has a certain ratio or more as the substance. The radiographic apparatus according to claim 13, wherein an extracted image extracted from a frame constituting a display processing image generated based on the identification image is generated.
The extraction means performs a comparison process with the statistical information based on the changed threshold value,
The radiographic apparatus according to claim 14, wherein an extracted image is generated by extracting a frame in which the statistical information has a certain ratio or more from a frame constituting the display processing image.
The display control means includes
The display means displays an image display area for displaying the display processed image and a timeline display area for displaying the statistical information in each frame in a graph according to the radiographic image capturing time. Item 16. The radiographic apparatus according to Item 14 or 15.
17. The radiation imaging apparatus according to claim 16, wherein the display control unit displays a threshold setting display by the threshold changing unit on the graph display.
The radiographic imaging apparatus according to claim 16 or 17, wherein the display control means displays the extraction range of a frame in which the statistical information has a certain ratio or more on the graph display.
The display control means displays a substance name list indicating the name of the substance and a substance designating unit for designating a substance to be extracted side by side with respect to the graph display. The radiation imaging apparatus according to any one of the above.
The extraction means acquires an extraction range of the frame for the substance designated by the substance designation unit, and generates an extraction image obtained by extracting a frame corresponding to the extraction range from frames constituting the display processing image. The radiographic apparatus according to claim 19.
The display control means causes the display means to display an extraction area designation means for designating a pixel range for calculating the statistical information,
The radiation imaging apparatus according to claim 16, wherein the extraction unit acquires the statistical information based on pixel value information of an image range designated by the extraction area designation unit.
The radiographic imaging according to claim 21, wherein the display control means causes the display-processed image displayed in the image display area to overlap and display the pixel range specified by the extraction area specifying means. apparatus.
The extraction means acquires, as the statistical information, a result of dividing the sum of pixel values of the substance identification image in the designated pixel range by the number of pixels in the pixel range from the substance identification image for each frame. The radiation imaging apparatus according to claim 21 or 22,
24. The radiographic apparatus according to claim 1, wherein the substance identification image is generated based on an effective atomic number or surface density of the substance.
Generating means for generating a substance identification image showing a distribution of a plurality of substances included in a radiographic image taken with different radiation energies;
For each frame constituting the substance identification image, obtaining statistical information on a specific substance, extracting means for extracting a frame based on the statistical information;
A radiation imaging system comprising:
Generating means for generating a substance identification image showing a distribution of a plurality of substances included in a radiographic image taken with different radiation energies;
Display information on a plurality of substances included in the radiation image is displayed on a display means, and a display control means for designating a specific substance for extracting a frame;
For each frame constituting the substance identification image, extraction means for obtaining statistical information on the specified specific substance and extracting a frame based on the statistical information;
A radiation imaging system comprising:
A radiation imaging method for a radiation imaging apparatus, comprising:
A generation step of generating a substance identification image indicating a distribution of a plurality of substances included in a radiographic image captured with energy of different radiation;
For each frame constituting the substance identification image, an extraction step for obtaining statistical information on a specific substance and extracting a frame based on the statistical information;
A radiation imaging method comprising:
A radiation imaging method for a radiation imaging apparatus, comprising:
A generation step of generating a substance identification image indicating a distribution of a plurality of substances included in a radiographic image captured with energy of different radiation;
A display control step for displaying information on a plurality of substances included in the radiation image on a display unit and designating a specific substance for extracting a frame;
For each frame constituting the substance identification image, obtaining statistical information on the specified specific substance, and extracting the frame based on the statistical information;
A radiation imaging method comprising:
A program for causing a computer to function as each unit of the radiation imaging apparatus according to any one of claims 1 to 23.