JP2009050465A - Mammography apparatus, image processing apparatus, and image processing program - Google Patents

Mammography apparatus, image processing apparatus, and image processing program Download PDF

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JP2009050465A
JP2009050465A JP2007220150A JP2007220150A JP2009050465A JP 2009050465 A JP2009050465 A JP 2009050465A JP 2007220150 A JP2007220150 A JP 2007220150A JP 2007220150 A JP2007220150 A JP 2007220150A JP 2009050465 A JP2009050465 A JP 2009050465A
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image
gradation
gradation adjustment
contrast
adjustment
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JP5106001B2 (en
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Shingo Kanemitsu
Hisanori Kato
久典 加藤
愼吾 金光
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Toshiba Corp
Toshiba Medical Systems Corp
東芝メディカルシステムズ株式会社
株式会社東芝
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Abstract

<P>PROBLEM TO BE SOLVED: To facilitate selection of a combination of contrast and concentration of a photographed image appropriate for diagnosis. <P>SOLUTION: In a mammography apparatus, a matrix displaying and processing section 24d makes a monitor section 22 display a matrix display of a plurality of gradation adjusted images which are acquired by adjusting gradations of a photographed image by using combinations of contrasts and concentrations set in a plurality of steps. When an operating section 21 receives a selected gradation adjusted image from among the plurality of gradation adjusted images on the matrix display, a photographed image gradation adjusting section 24e adjusts gradation of a photographed image displayed on the monitor section 22 by using the contrast and the concentration of the selected and received gradation adjusted image. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a mammography apparatus, an image processing apparatus, and an image processing program that perform X-ray imaging of a subject's breast, and more particularly, to gradation adjustment when displaying a captured image.

  Conventionally, in breast examination using a mammography apparatus (also referred to as a “mammography apparatus”), the degree of malignancy is diagnosed by comparing the degree of lightness of calcification displayed in a photographed image. . Therefore, when all the calcifications projected in the same image look the same, the malignancy cannot be accurately diagnosed. Therefore, a mammography apparatus generally has a function of adjusting the contrast, density, and the like of a captured image (see, for example, Patent Document 1).

  FIG. 10 is a diagram showing an example of contrast and density adjustment functions in a conventional mammography apparatus. For example, in a conventional mammography apparatus, as shown in FIG. 7A, the left and right breast images are displayed, and a slider for adjusting the density and contrast of each image (see FIG. The “density adjustment slider” and “contrast adjustment slider” shown in FIG. Then, after selecting the photographic image to be adjusted, by moving these sliders to the left and right, the density of the displayed photographic image and the contrast level are adjusted as shown in FIG. Each can be adjusted.

JP 2004-105746 A

  However, in the conventional mammography apparatus described above, it is necessary to adjust contrast and density separately while observing changes in the displayed captured image, and a combination of contrast and density of the captured image suitable for diagnosis. There is a problem that it takes considerable skill to find.

  As described above, in breast diagnosis, it is very important to adjust the contrast and density of images in order to diagnose the malignancy of calcification. Whether a combination of contrast and density can be found has become a very big challenge.

  The present invention has been made to solve the above-described problems of the prior art, and a mammography apparatus and an image processing apparatus capable of easily finding a combination of contrast and density of a captured image suitable for diagnosis. An object of the present invention is to provide an image processing program.

  In order to solve the above-described problems and achieve the object, a mammography apparatus that displays a captured image by performing X-ray imaging of a subject's breast, and a combination of contrast and density set in a plurality of stages A gradation adjustment image display means for displaying a plurality of gradation adjustment images obtained by adjusting the gradation of the photographed image in a matrix, and a plurality of gradation adjustment images displayed in a matrix by the gradation adjustment image display means. A gradation adjustment image selection unit that receives selection of a single or a plurality of gradation adjustment images from among the gradation adjustment images; and when the selection of the gradation adjustment image is received by the gradation adjustment image selection unit, the gradation adjustment image And photographic image gradation adjusting means for adjusting the gradation of the photographic image using the contrast and density.

  According to a fifth aspect of the present invention, there is provided an image processing apparatus for processing a captured image captured by a mammography apparatus that performs X-ray imaging of a subject's breast, wherein the contrast is set in a plurality of stages. And gradation adjustment image display means for displaying a plurality of gradation adjustment images obtained by adjusting the gradation of the photographed image by a combination of density and a plurality of levels displayed in matrix by the gradation adjustment image display means. A tone-adjusted image selecting unit that accepts selection of a single or a plurality of tone-adjusted images from the tone-adjusted image; and when the tone-adjusted image is selected by the tone-adjusted image selecting unit, Photographic image gradation adjusting means for adjusting the gradation of the photographic image using the contrast and density of the gradation adjusted image.

  According to a sixth aspect of the present invention, there is provided an image processing program for processing a captured image captured by a mammography apparatus that performs X-ray imaging of a subject's breast, wherein the contrast is set in a plurality of stages. A gradation-adjusted image display procedure for displaying a plurality of gradation-adjusted images obtained by adjusting the gradation of the photographed image by a combination of density and a matrix, and a plurality of levels displayed in a matrix by the gradation-adjusted image display procedure. A gradation adjustment image selection procedure for accepting selection of one or a plurality of gradation adjustment images from the tone adjustment image, and when the selection of the gradation adjustment image is accepted by the gradation adjustment image selection procedure, A photographed image gradation adjustment procedure for adjusting the gradation of the photographed image using the contrast and density of the gradation adjusted image is executed by a computer.

  According to the present invention, it is possible to easily find a combination of contrast and density of a captured image suitable for diagnosis.

  Exemplary embodiments of a mammography apparatus, an image processing apparatus, and an image processing program according to the present invention will be described below in detail with reference to the accompanying drawings.

  First, the configuration of the mammography apparatus according to the first embodiment will be described. FIG. 1 is a diagram illustrating the configuration of the mammography apparatus according to the first embodiment. As shown in the figure, this mammography apparatus includes an X-ray tube 1, a radiation quality adjustment filter / irradiation field limiting mask 2, a face guard 3, a breast compression plate 4, a grid 5, and an imaging table. 6, a compression foot pedal 7, an information display panel 8, a C-arm up / down and rotation fine adjustment switch 9, a side panel 10, an imaging condition setting panel 11, and an X-ray high voltage device 12. And the image processing apparatus 20 are connected to each other.

  The X-ray tube 1 is a vacuum tube for generating X-rays, and the quality control filter and the irradiation field limiting mask 2 adjust the quality of X-rays generated by the X-ray tube 1 and limit the irradiation field. It is an adjustment tool for doing. The face guard 3 is a protective device for protecting the subject during imaging, and the breast compression plate 4 is a compression device for pressing the breast of the subject during imaging.

  The grid 5 is an instrument for removing scattered radiation to improve image contrast, and the imaging table 6 includes an FPD (Flat Panel Detector) for detecting X-rays transmitted through the breast. It is a stand with. The compression foot pedal 7 is a pedal for adjusting the position of the breast compression plate 4 in the vertical direction, and the information display panel 8 is a panel for displaying various information such as compression information.

  The C-arm up / down fine rotation switch 9 is a switch for moving the C-arm constituted by the X-ray tube 1 and the imaging table 6 up and down and rotating, and the side panel 10 is a mammogram. It is an operation panel for controlling each part of an imaging device. The imaging condition setting panel 11 is a panel for setting X-ray imaging conditions, and the X-ray high voltage device 12 is a device that supplies a voltage to the X-ray tube 1.

  The image processing apparatus 20 is an apparatus that controls the operation of the entire mammography apparatus and performs image processing on a captured image captured by the mammography apparatus. FIG. 2 is a functional block diagram showing the configuration of the image processing apparatus 20. In addition, in the same figure, in addition to the image processing apparatus 20, a part of an imaging stand apparatus is also shown.

  As shown in the figure, in the imaging table apparatus, when X-rays are generated by the X-ray tube 1, the X-rays are subjected to imaging with the breast compression plate 4 after the irradiation range is reduced by the X-ray movable diaphragm 13. The breast P pressed against the table 6 is irradiated. X-rays that have passed through the breast P are detected by the FPD 14, converted into projection data, and transmitted to the image processing apparatus 20.

  On the other hand, the image processing apparatus 20 includes an operation unit 21, a monitor unit 22, a storage unit 23, and a control unit 24, as shown in FIG. The operation unit 21 is configured by, for example, a mouse, a keyboard, and the like, and is an input unit for receiving various operations on the imaging platform device and the image processing device 20. The monitor unit 22 is an output unit that displays various images generated based on the projection data generated by the imaging platform device, or displays a GUI for receiving various operations by the operation unit 21.

  The storage unit 23 is a storage unit that stores data necessary for various processes performed by the control unit 24. The storage unit 23 includes an image data storage unit 23a. The image data storage unit 23a is a storage unit that stores an image generated from the projection data transmitted from the imaging platform apparatus.

  The control unit 24 is a processing unit that controls the operation of the imaging platform device and the entire image processing apparatus 20, and as for the present invention, an image data collection unit 24a, a display control unit 24b, and a captured image display processing unit. 24c, a matrix display processing unit 24d, and a captured image gradation adjusting unit 24e. The image data collection unit 24a is a processing unit that receives projection data transmitted from the imaging platform apparatus, generates an image from the received projection data, and stores the image in the image data storage unit 23a.

  The display control unit 24b is a processing unit that controls each processing unit based on various operations received by the operation unit 21 and a photographing mode notified from the photographing stand device. For example, the display control unit 24 b switches the display mode of the captured image between “normal display mode” and “matrix display mode” based on an instruction from the operator received by the operation unit 21.

  The switching of the photographing mode may be performed by, for example, a mode switching button provided on the keyboard of the operation unit 21 or the monitor unit 22, or automatically performed by dragging a contrast or density slider with a mouse. May be. Alternatively, it may be performed by a predetermined operation such as right-clicking or double-clicking the mouse on the image to be adjusted, or a menu is displayed when the mouse is right-clicked on the screen. This may be done by selecting switching.

  For example, when the operation control unit 21 receives an instruction to set the imaging mode as the normal display mode, the display control unit 24b instructs the captured image display processing unit 24c to measure the left and right breasts of the designated subject. The monitor image 22 is instructed to be displayed after adjusting the gradation using the contrast and density as initial values.

  In addition, when the operation unit 21 receives an instruction to set the imaging mode to the matrix display mode, the display control unit 24b transmits a captured image of the breast of the designated subject to the matrix display processing unit 24d. The monitor unit 22 is instructed to display a plurality of images (hereinafter referred to as “tone-adjusted images”) adjusted with combinations of different contrasts and densities on the monitor unit 22. The matrix display of the gradation adjustment image will be described later in detail.

  In addition, when the selection of one tone adjustment image from the tone adjustment images displayed in matrix by the matrix display processing unit 24d is accepted by the operation unit 21, the display control unit 24b takes a photographed image tone. The adjustment unit 24e is instructed to adjust the gradation of the photographed image using the contrast and density of the gradation adjustment image that has been selected.

  The photographed image display processing unit 24c is a processing unit that reads out the image stored in the image data storage unit 23a and displays the image on the monitor unit 22 under the control of the display control unit 24b. Specifically, when the display control unit 24b instructs the captured image display processing unit 24c to display the captured images of the left and right breasts of the subject, the captured left and right captured images are stored in image data. Read from the unit 23a. Then, the captured image display processing unit 24 c adjusts the gradation using the contrast and density that are initial values for the read captured image, and displays the adjusted captured image on the monitor unit 22.

  FIG. 3 is a diagram illustrating an example of a captured image display in the normal display mode. For example, as shown in the figure, the captured image display processing unit 24c divides the predetermined display area of the monitor unit 22 into two, displays the captured image of the right breast on the left side, and displays the left breast on the right side. Display the captured image. At this time, the captured image display processing unit 24c displays the captured images of the left and right breasts that are captured with the same positioning (CC (capturing in the head and tail direction) or MLO (internal and external oblique direction)).

  The matrix display processing unit 24d reads the image stored in the image data storage unit 23a under the control of the display control unit 24b to generate a gradation adjustment image, and the generated gradation adjustment image is sent to the monitor unit 22 in the matrix. It is a processing unit to display. Specifically, when the display control unit 24b instructs the matrix display processing unit 24d to display the gradation adjustment image in a matrix, the matrix display processing unit 24d displays the contrast and density set in advance in a plurality of stages within the adjustable range. Combine each. The adjustable range here is a range that can be adjusted by a contrast adjustment slider or a density adjustment slider.

  Subsequently, the matrix display processing unit 24d reads out a captured image of the subject's breast designated by the operator from the image data storage unit 23a, and adjusts the read captured image with a combination of different contrast and density. An adjusted image is generated and displayed in a matrix on the monitor unit 22. Here, matrix display means, for example, changing the contrast (or density) stepwise in the horizontal axis direction and changing the density (or contrast) stepwise in the vertical axis direction, and changing the contrast and density at each step. It is to display a gradation adjustment image whose gradation is adjusted by using a grid pattern.

  FIG. 4 is a diagram illustrating an example of the display of the gradation adjustment image in the matrix display mode. For example, as shown in the figure, the matrix display processing unit 24d changes the contrast so as to increase stepwise from left to right in the horizontal axis direction and gradually increases in the vertical axis direction from bottom to top. The tone adjustment image is displayed in a matrix by changing the density so as to be. Here, a case is shown in which the gradation adjusted image is displayed by dividing the contrast and density into five stages within the adjustable range.

  In the example shown in the figure, the matrix display processing unit 24d displays a frame around the image of the gradation adjustment image having the same contrast and density as the captured image displayed at that time. ("Frame showing current settings" shown in the figure). As a result, it is possible to easily grasp where the currently displayed captured image is relatively located among the plurality of gradation adjustment images displayed in matrix. This frame moves onto the selected gradation adjustment image every time the gradation adjustment image is selected by the operator.

  In this way, the matrix display processing unit 24d adjusts the gradation of the captured image with a combination of contrast and density set in a plurality of stages, and displays a plurality of gradation adjustment images obtained thereby in a matrix manner, It is possible to easily grasp visually where the contrast and density of the displayed captured image are within the adjustable range.

  Returning to the description of FIG. 2, the photographed image gradation adjusting unit 24e adjusts the gradation of the photographed image using the contrast and density of the gradation adjusted image selected by the operator under the control of the display control unit 24b. A processing unit to be adjusted. Specifically, when the photographed image gradation adjusting unit 24e is instructed to adjust the gradation of the displayed photographed image from the display control unit 24b, the photographed image already displayed on the monitor unit 22 is displayed. Are adjusted so as to be the contrast and density of the gradation-adjusted image whose selection is accepted.

  Next, a processing procedure of the mammography apparatus according to the first embodiment will be described. FIG. 5 is a flowchart illustrating the processing procedure of the mammography apparatus according to the first embodiment. As shown in the figure, in this mammography apparatus, when the subject's breast is imaged by the imaging table apparatus, the image processing apparatus 20 controls the captured image display processing section under the control of the display control section 24b. 24c displays the captured image on the monitor unit 22 (step S11).

  When switching to the matrix display mode is accepted by the operation unit 21 (step S12, Yes), a plurality of matrix display processing units 24d adjusted with different contrasts and densities under the control of the display control unit 24b. Are displayed in a matrix on the monitor unit 22 (step S13).

  When the selection of one tone adjustment image from the tone adjustment images displayed in matrix is accepted by the operation unit 21 (step S14, Yes), the photographed image tone adjustment unit 24e displays the display control unit 24b. Under the control of (2), the gradation of the photographed image is adjusted using the contrast and density of the gradation adjustment image selected by the operator (step S15).

  As described above, in the first embodiment, the matrix display processing unit 24d displays a plurality of gradation adjustment images obtained by adjusting the gradation of the photographed image with a combination of contrast and density set in a plurality of stages. A matrix is displayed on the monitor unit 22. When the selection of the gradation adjustment image is received from the plurality of gradation adjustment images displayed in matrix by the operation unit 21, the photographed image gradation adjustment unit 24e selects the gradation adjustment image for which the selection has been received. Using the contrast and density, the gradation of the captured image displayed on the monitor unit 22 is adjusted. Thereby, in the first embodiment, it is possible to easily find a combination of contrast and density of a captured image suitable for diagnosis.

  Although the embodiments of the present invention have been described so far, the present invention may be implemented in various different forms other than the embodiments described above. Therefore, another embodiment included in the present invention will be described below as a second embodiment.

(1) Display of frame indicating setting of photographed image of opposite side breast In the first embodiment, the case where the matrix display processing unit 24d displays a frame indicating the current setting has been described (see FIG. 4). As a modification of this, for example, a scene in which the contrast and density of a captured image of the opposite breast is adjusted after the optimal contrast and density of the captured image of one breast is set, and a frame indicating the current setting is set. In addition, a frame indicating the setting of the captured image of the opposite breast may be displayed.

  FIG. 6 is a diagram illustrating an example of a frame display indicating the setting of the captured image of the opposite breast. For example, as shown in the figure, the matrix display processing unit 24d displays, in addition to the frame indicating the current setting, a frame indicating the setting of the captured image of the opposite breast on the matrix-adjusted gradation adjustment image. To display.

  In this way, by displaying the frame indicating the setting of the captured image of the opposite breast, when comparing the degree of calcification lightness displayed in the captured images of the left and right breasts, the contrast of each captured image It is possible to easily grasp whether the concentration is the same or different, and if it is different, how much the concentration is different.

(2) Movement of tone-adjusted image displayed in matrix In the first embodiment, the matrix display processing unit 24d displays the tone-adjusted image by dividing the contrast and density into five stages within the adjustable range. The case has been described (see FIG. 4). As a modified example, for example, the number of steps for dividing contrast and density within the adjustable range is further increased, and for a portion that does not fit in the display area of the matrix display, the mouse of the operation unit 21 is operated (for example, dragged) to increase the level. You may make it display by scrolling (moving) the matrix of a tone adjustment image.

  FIG. 7 is a diagram illustrating an example of movement of the gradation adjustment image displayed in matrix. For example, as shown in the figure, the matrix display processing unit 24d generates a plurality of gradation adjustment images in which contrast and density are stepped so as to exceed the display area of the matrix display. The matrix display processing unit 24d, for example, when the operator moves the matrix of the gradation adjustment image in the lower right direction, the range that was initially displayed in the matrix according to the movement (shown in the figure). The gradation adjustment image located at the upper left of the “first matrix display range”) is displayed in the display area (“matrix display range after scrolling” shown in FIG. 5).

  In this case, when the matrix display processing unit 24d first displays the gradation adjustment image in a matrix, the gradation adjustment image (pixel) having the best balance of contrast and density among the plurality of generated gradation adjustment images. A plurality of gradation adjustment images are displayed in a matrix so that the image is specified at the center.

  In this way, the matrix display processing unit 24d displays a plurality of gradation adjustment images in a matrix so that the gradation adjustment image having the best balance is centered first, and further performs gradation adjustment based on an operation by the operator. By moving the image, it is possible to easily confirm a wide range of contrast and density settings around the current setting, and it is possible to reliably select an optimal image.

(3) Contrast and Density Adjustment Using Matrix Displayed Tone Adjustment Image In the first embodiment, the photographed image tone adjustment unit 24e selects a floor selected from the matrix display tone adjustment image. The case where the gradation of the captured image is adjusted based on the contrast and density of the tone adjustment image has been described. As a modified example, the operator operates the mouse on a plurality of gradation-adjusted images displayed in matrix to move the pointer indicating the state of the photographed image, so that the contrast and density corresponding to the position of the pointer are set. It is also possible to continuously change the gradation of the captured image.

  FIG. 8 is a diagram illustrating an example of contrast and density adjustment using a matrix-adjusted gradation adjustment image. For example, as shown in the figure, when the operator moves the pointer indicating the state of the captured image using the mouse on the matrix display of the gradation adjusted image, as shown in FIG. With the density setting, the gradation of the captured image (not shown) displayed side by side in the matrix display is continuously changed.

  As described above, the photographed image gradation adjustment unit 24e continuously changes the gradation of the photographed image in accordance with the operation by the operator, and thus the photographed image gradation adjustment unit 24e refers to the plurality of gradation adjustment images displayed in matrix. The contrast and density of the image can be continuously adjusted, and the gradation of the captured image can be easily finely adjusted.

  Here, the contrast and density of the captured image are adjusted when the pointer indicating the captured image state is moved using the mouse on the gradation adjusted image. For example, the gradation adjusted image is selected. By moving the mouse pointer up / down / left / right on the captured image after changing the gradation of the captured image, the density / contrast is continuously displayed. It may be possible to change it to.

(4) Displaying a plurality of photographed images In the first embodiment, the photographed image gradation adjustment unit 24e displays the photographed image with the contrast and density of the gradation adjustment image selected from the gradation adjustment images displayed in matrix. The case where the gradation is adjusted has been described. As a modified example, a plurality of gradation adjustment images can be selected by the operation unit 21, and the photographed image gradation adjustment unit 24 e adjusts the gradation and the density of the selected plurality of gradation adjustment images. You may make it display the some picked-up image which adjusted the tone.

  FIG. 9 is a diagram illustrating an example of a plurality of displayed captured images. For example, when two gradation adjustment images are selected by the operator, the matrix display processing unit 24d displays a frame around each gradation adjustment image as shown in FIG. “Frame indicating the setting of the first captured image” and “Frame indicating the setting of the second captured image”). At the same time, the photographed image gradation adjusting unit 24e displays a plurality of photographed images whose gradations are adjusted with the contrast and density of the two selected gradation adjusted images, respectively (the “first photographed image shown in FIG. And “second captured image”).

  In this way, the photographic image tone adjustment unit 24e displays the plurality of photographic images whose gradations are adjusted based on the contrast and density of the plurality of tone adjustment images selected by the operator. It is possible to easily compare a plurality of captured images with different values, and it is possible to more easily find the optimum contrast and density.

  As described above, the mammography apparatus, the image processing apparatus, and the image processing program according to the present invention are useful for tone adjustment when displaying a captured image, and in particular, an optimal combination of contrast and density. It is suitable for optimizing the gradation of a captured image by finding

1 is a diagram illustrating a configuration of a mammography apparatus according to a first embodiment. It is a functional block diagram which shows the structure of an image processing apparatus. It is a figure which shows an example of the display of the picked-up image in normal display mode. It is a figure which shows an example of the display of the gradation adjustment image in matrix display mode. 3 is a flowchart illustrating a processing procedure of the mammography apparatus according to the first embodiment. It is a figure which shows an example of the display of the frame which shows the setting of the picked-up image of the opposite breast. It is a figure which shows an example of the movement of the gradation adjustment image currently displayed by the matrix. It is a figure which shows an example of the adjustment of contrast and density using the gradation adjustment image displayed in matrix. It is a figure which shows an example of the multiple display of a picked-up image. It is a figure which shows an example of the adjustment function of the contrast and density in the conventional mammography apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 X-ray tube 2 Irradiation field restriction mask 3 Face guard 4 Breast compression board 5 Grid 6 Imaging stand 7 Compression foot pedal 8 Information display panel 9 C arm vertical / rotation fine adjustment switch 10 Side panel 11 Imaging condition setting panel 12 X-ray height Voltage device 20 Image processing device 21 Operation unit 22 Monitor unit 23 Storage unit 23a Image data storage unit 24 Control unit 24a Image data collection unit 24b Display control unit 24c Captured image display processing unit 24d Matrix display processing unit 24e Captured image gradation adjustment unit

Claims (6)

  1. A mammography apparatus for performing X-ray imaging of a breast of a subject and displaying a captured image,
    Gradation adjustment image display means for displaying a plurality of gradation adjustment images obtained by adjusting the gradation of the photographed image with a combination of contrast and density set in a plurality of stages in a matrix;
    Gradation adjustment image selection means for receiving selection of a single or a plurality of gradation adjustment images from a plurality of gradation adjustment images displayed in matrix by the gradation adjustment image display means;
    A photographic image gradation adjusting means for adjusting the gradation of the photographed image using the contrast and density of the gradation adjusted image when selection of the gradation adjusted image is accepted by the gradation adjusted image selecting means; ,
    A mammography apparatus characterized by comprising:
  2.   When the plurality of gradation adjustment images are displayed in a matrix, the gradation adjustment image display means displays a gradation adjustment image having the same contrast and density as that of the already displayed captured image by changing the display method. The mammography apparatus according to claim 1, wherein:
  3.   The gradation adjustment image display means accepts designation of movement in an arbitrary direction with respect to the plurality of gradation adjustment images displayed in a matrix, and moves the plurality of gradation adjustment images based on the designation of movement accepted. 3. The mammography apparatus according to claim 1, wherein a gradation adjustment image deviated from a display area of the matrix display is displayed according to the direction of the movement.
  4. The gradation adjustment image selecting means further accepts designation of an arbitrary position for the plurality of gradation adjustment images;
    The photographed image gradation adjusting means continuously adjusts the gradation of the photographed image using a combination of contrast and density corresponding to the position in accordance with a change in position accepted by the gradation adjusted image selecting means. The mammography apparatus according to claim 1, 2 or 3, wherein the mammogram is adjusted in an automatic manner.
  5. An image processing apparatus that processes a captured image captured by a mammography apparatus that performs X-ray imaging of a breast of a subject,
    Gradation adjustment image display means for displaying a plurality of gradation adjustment images obtained by adjusting the gradation of the photographed image with a combination of contrast and density set in a plurality of stages in a matrix;
    Gradation adjustment image selection means for receiving selection of a single or a plurality of gradation adjustment images from a plurality of gradation adjustment images displayed in matrix by the gradation adjustment image display means;
    A photographic image gradation adjusting means for adjusting the gradation of the photographed image using the contrast and density of the gradation adjusted image when selection of the gradation adjusted image is accepted by the gradation adjusted image selecting means; ,
    An image processing apparatus comprising:
  6. An image processing program for processing a captured image captured by a mammography apparatus that performs X-ray imaging of a breast of a subject,
    A gradation-adjusted image display procedure for displaying a plurality of gradation-adjusted images obtained by adjusting the gradation of the photographed image with a combination of contrast and density set in a plurality of stages,
    A gradation adjustment image selection procedure for accepting selection of a single or a plurality of gradation adjustment images from a plurality of gradation adjustment images displayed in a matrix by the gradation adjustment image display procedure;
    A photographic image gradation adjustment procedure for adjusting the gradation of the photographic image using the contrast and density of the gradation adjustment image when selection of the gradation adjustment image is accepted by the gradation adjustment image selection procedure; ,
    An image processing program for causing a computer to execute.
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